Showing posts with label a. Show all posts
Showing posts with label a. Show all posts

Tuesday, November 18, 2014

Triac Light Switch as a dimers

The series of light switches this time slightly different from the voltage of work. The series of light switches can work directly on the AC power network. Light switches are using the main component of TRIAC and LDR. The circuit is very simple and the components were sold in the market.

If you want a light reception sensitivity of this circuit can be arranged then the 3.3 MOhm resistor can be replaced with a variable resistor. For more details can be seen from the following series of images.
Triac Light Switch as a dimers Circuit Diagram

With Triac Light Switch series is as dimers, but dimers control performed by the reception of light around the LDR. The lower the intensity cayaha received LDR then  bright lights. For installation LDR need to be considered so as not exposed to light from the lamp directly.
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Wednesday, October 29, 2014

Amplifier Class A Headphone Circuit Diagram

This circuit is derived from the Portable Headphone Amplifier featuring an NPN/PNP compound pair emitter follower output stage. An improved output driving capability is gained by making this a push-pull Class-A arrangement. Output power can reach 427mW RMS into a 32 Ohm load at a fixed standing current of 100mA. The single voltage gain stage allows the easy implementation of a shunt-feedback circuitry giving excellent frequency stability.

Circuit diagram :
Amplifier
Class-A Headphone Amplifier Circuit diagram

The above mentioned shunt-feedback configuration also allows the easy addition of frequency dependent networks in order to obtain an useful, unobtrusive, switchable Tilt control (optional). When SW1 is set in the first position a gentle, shelving bass lift and treble cut is obtained. The central position of SW1 allows a flat frequency response, whereas the third position of this switch enables a shelving treble lift and bass cut.
Note:
  • Before setting quiescent current rotate the volume control P1 to the minimum, Trimmer R6 to zero resistance and Trimmer R3 to about the middle of its travel.
  • Connect a suitable headphone set or, better, a 33 Ohm 1/2W resistor to the amplifier output.
  • Connect a Multimeter, set to measure about 10Vdc fsd, across the positive end of C5 and the negative ground.
  • Switch on the supply and rotate R3 in order to read about 7.7-7.8V on the Multimeter display.
  • Switch off the supply, disconnect the Multimeter and reconnect it, set to measure at least 200mA fsd, in series to the positive supply of the amplifier.
  • Switch on the supply and rotate R6 slowly until a reading of about 100mA is displayed.
  • Check again the voltage at the positive end of C5 and readjust R3 if necessary.
  • Wait about 15 minutes, watch if the current is varying and readjust if necessary.


Parts List :
P1 : 22K Dual gang Log Potentiometer 
R1 : 15K
R2 : 220K
R3 : 100K
R4 : 33K
R5 : 68K
R6 : 50K
R7 : 10K
R8,R9 : 47K
R10,R11 : 2R2
R12 : 4K7
R13 : 4R7
R14 : 1K2
R15,R18 : 330K
R16 : 680K
R17,R19 : 220K
R20,R21 : 22K
C1,C2,C3,C4 : 10µF/25V
C5,C7 : 220µF/25V
C6,C11 : 100nF
C8 : 2200µF/25V
C9,C12 : 1nF
C10 : 470pF
C13 : 15nF
D1 : LED
D2,D3 : 1N4002
Q1,Q2 : BC550C
Q3 : BC560C
Q4 : BD136
Q5 : BD135
IC1 : 7815
T1 : 15CT/5VA Mains transformer
SW1 : 4 poles 3 ways rotary Switch
SW2 : SPST slide or toggle Switch
 
 
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Wednesday, October 15, 2014

Build a 2M 6M Transverter Circuit Diagram

Using the bilateral properties of a balanced mixer this transvertcr will produce 6-m output with 2-m inputs. Y1 is a 90-MHz crystal. Note that the input on 2 m is 143 to 144 MHz for 53 to 54-MHz output. This avoids possibility of extraneous 2-m reception during receive periods. If your radio will not transmit below 144 MHz, then use a 93- or 94-MHz crystal frequency.


2M 6M Transverter Circuit Diagram

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Build a 3 Channels Audio Splitter Amplifier Circuit Diagram using TL084

This is the schematic diagram of 3 channels audio splitter amplifier circuit which built using op-amp IC TL084. The 3 channels amplifier output distribution applies a single TL084.

  3 Channels Audio Splitter Amplifier Circuit Diagram

 3 channels audio splitter amplifier circuit diagram


The very first step is to capacitive coupling having a p. 1.0 ~ electrolytic capacitor. The entries are railways Vee Y2 or 4.5 V. This enables working with an individual 9V power source. A voltage gain of 10 (1 M?/100 Kohm) is obtained in the first stage, as well as the other three floors are connected as a unity gain voltage followers. Every single output stage drives independently through an amplifier output 50 pF capacitor towards the resistance of 5.1 k ohm load. The response range is flat from 10 Hz to 30 kHz.
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Wednesday, October 1, 2014

Make a Door Bell with Memory Circuit

On occasion it may be useful to know when a visitor has called in your absence. This is especially true in the case of an enforced absence when a visitor is expected. Confusion reigns supreme on these occasions.
The circuit here helps to rectify the ’ situation by providing a memory for the doorbell. On your return a LED will advise you whether or not a visitor called. The circuit is powered by the bell transformer via diode D1 and capacitor C1. This provides a d.c. voltage level sufficient for the memory’. Under normal conditions (with no one ringing the doorbell) transistor T1 will be switched off and T2 will be conduc- ting to provide a form of latch for T1. Obviously LED D3 will never light under these conditions! Now our visitor arrives! With a joyful cry of Avon calling’ they press the doorbell — only to lapse into total embarrasment when there is no answer! However our circuit now leaps into action. Via D2 and R 1, the doorbell switch S1 provides a base drive current to T1 which . switches off. T2 and, in passing, i LED D3 on. `&low thm transistor i ’latch’ (T2) swings the other way and T1 is held on by the current path to the positive supply through S2 (normally closed) R5 and R6. The unfortunate visitor goes away totally deflated but the LED will indicate his past presence’l On your return the LED will be noted and the circuit reset’.

This is carried out by simply pressing S2 which breaks the base currents path holding T1 on causing this transistor to switch off. In doing so the LED will be switched off and T2 will be switched on. The ’latch’ will be back in the original position where T1 is held off by the fact that R5 is effectively in parallel with R2. A further refinement would be to provide an automatic reset when the front door is opened. ln this case S2 is a switch operated by the opening door. However the LED must then be mounted outside the door (poss- ibly in the doorbell switch housing) or the LED will be off by the time you get into the house to look! On the other hand a second circuit could be built as a ’memory’ for the automatic’ memory and then it would be no problem to open the door! This second circuit will of course require a reset switch!
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Thursday, September 18, 2014

Build a Digital Theremin Wiring diagram Schematic

Theremin schema shown in this schematic diagram uses digital component, so we can call it a digital Theremin. This schema employs  logic inverter 74C04 or CD4069 hex inverter and CD4046 phase-locked-loop (PLL) IC. 

The CD4069 logic inverter is operated as a fixed-frequency oscillator with  frequency around 100kHz. The CD4046 is operated as a variable frequency oscillator which is adjustable around 100kHz. The exact center frequency of the on-chip oscillator is determined by R4, C2 and R3. Here is the schematic diagram of the schema. 

Digital Theremin Circuit Diagram


The frequency of variable oscillator frequency schema can be shifted several kilohertz by moving your hand approaching the antenna since the C2 and the antenna form an equivalent parallel capacitance. The frequency of the variable oscillator should be set to the same frequency of fixed oscillator when there is no hand or human body close to the antenna. 

This  calibration is done by adjusting the  zero control R4 pot with this simple rule: If  both oscillators (the fixed and the variable) are set to the same frequency then the Theremin will produce no output (silent). This Theremin schema will start  producing audible tone if you move your hand approaching the antenna since it will shift the frequency of the variable oscillator. You can play this Theremin schema by moving your right hand around the antenna and at the same time turning the volume knob R5 with your left hand.
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Sunday, September 14, 2014

Digital Thermometer with data processing of a microcontroller AT89C4051

digital
Digital Thermometer 0-100.0°C is a digital thermometer that operates in modetemperature measurement in Celsius (° C). Digital Thermometer 0-100.0 ° C in this article uses data processor in the form of a microcontroller AT89C4051.



Temperature sensors used in Digital Thermometer 0-100.0 ° C. This temperature sensor LM35D. Digital Thermometer 0-100.0 ° C. It uses the temperature measurement data viewer in the form of 1 line LCD viewer. Digital Thermometer 0-100.0 ° C. It can display the temperature measurement data with a resolution of 0.1 ° C.

Digital
Digital Thermometer Circuit Diagram


Digital Thermometer 0-100.0 ° C. These temperature sensors make use of LM35D as temperature sensing. In Digital Thermometer 0-100.0 ° C. This temperature sensor measurement data this LM35D (Level Voltage) is then converted into 4-bit binary data using the ADC CA3162.

Then the 4-bit data from ADC CA3162 which is a measurement of data if the temperature is in the AT89C4951 microcontroller so that it becomes an operating principle of temperature measurement based on digital thermometers. In the final stage of the Digital Thermometer 0-100.0 ° C. This is the appearance of digital data temperature measurement, using digital data viewer of the LCD 1 line.
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Monday, September 8, 2014

Build a LF or HF field Strength Meter Wiring diagram Schematic

How to Build a LF or HF field Strength Meter Circuit Diagram ? That is a good question but i share with you friend short description may be you are very genius you can make it easily . In this schema CI and LI resonate on the 1750 meter band, with coverage from 150 kHz to 500 kHz. LI can be slug-tuned for 160-to-190 kHz coverage alone or a 2.5 mH choke can be used for LI, if desired, using CI for tuning. A 1N270 germanium diode rectifies the RF signal and C2 is charged at the peak RF level. 

 LF or HF field Strength Meter Circuit Diagram


LF

This dc level is amplified by an LM358. The gain is determined by R2 and R3, 1 100-kilohm linear potentiometer that varies the dc gain from 1 to 100, driving the 50 microampere meter. This field strength meter need not be limited to LF use. The Table shows the LI and CI values for HF operation and broadband operation.
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Saturday, September 6, 2014

Make a Photodiode Alarm

This Photodiode based Alarm can be used to give a warning alarm when someone passes through a protected area. The schema is kept standby through a laser beam or IR beam focused on to the Photodiode. When the beam path breaks, alarm will be triggered.

The schema uses a PN Photodiode in the reverse bias mode to detect light intensity. In the presence of Laser / IR rays, the Photodiode conducts and provides base bias to T1. The NPN transistor T1 conducts and takes the reset pin 4 of IC1 to ground potential. IC1 is wired as an Astable oscillator using the components R3, VR1 and C3. The Astable operates only when its resent pin becomes high. When the Laser / IR beam breaks, current thorough the Photodiode ceases and T1 turns off. The collector voltage of T1 then goes high and enables IC1. The output pulses from IC1 drives the speaker and alarm tone will be generated.

Photo-Diode Alarm Circuit

Circuit
IR Transmitter Circuit
Circuit
A simple IR transmitter schema is given which uses Continuous IR rays. The transmitter can emit IR rays up to 5 meters if the IR LEDs are enclosed in black tubes.
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Friday, September 5, 2014

A Simple MD Catridge Preamplifier

Phonographs are gradually becoming a rarity. Most of them have had to yield to more advanced systems, such as CD players and recorders or (portable) MiniDisc player/recorders. This trend is recognized by manufacturers of audio installations, which means that the traditional phono input is missing on increasingly more systems. Hi-fi enthusiasts who want make digital versions of their existing collections of phonograph records on a CD or MD, discover that it is no longer possible to connect a phonograph to the system.
Circuit diagram :
A A Simple MD Catridge Preamplifier Circuit Diagram
However, with a limited amount of schemary, it is possible to adapt the line input of a modern amplifier or recorder so that it can handle the low-level signals generated by the magnetodynamic cartridge of a phonograph. Of course, the schema has to provide the well-known RIAA correction that must be used with these cartridges. The preamplifier shown here performs the job using only one opamp, four resistors and four capacitors. For a stereo version, you will naturally need two of everything. Any stabilized power supply that can deliver ±15V can be used as a power source.
Author : H. Steeman
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Sunday, August 31, 2014

Power Flip Flop Using A Triac Wiring diagram Schematic

Modern electronics is indispensable for every large model railroad system, and it provides a solution to almost every problem. Although ready-made products are exorbitantly expensive, clever electronics hobbyists try to use a minimum number of components to achieve optimum results together with low costs. This approach can be demonstrated using the rather unusual semiconductor power flip-flop described here. A flip-flop is a toggling schema with two stable switching states (bistable multivibrator). It maintains its output state even in the absence of an input pulse.

Flip-flops can easily be implemented using triacs if no DC voltage is available. Triacs are also so inexpensive that they are often used by model railway builders as semiconductor power switches. The decisive advantage of triacs is that they are bi-directional, which means they can be triggered during both the positive and the negative half-cycle by applying an AC voltage to the gate electrode (G). The polarity of the trigger voltage is thus irrelevant. Triggering with a DC current is also possible. Figure 1 shows the schema diagram of such a power flop-flop. A permanent magnet is fitted to the model train, and when it travels from left to right, the magnet switches the flip-flop on and off via reed switches S1 and S2.

Power Flip-Flop Using A Triac  Circuit diagram:

Power


In order for this to work in both directions of travel, another pair of reed switches (S3 and S4) is connected in parallel with S1 and S2. Briefly closing S1 or S3 triggers the triac. The RC network C1/R2, which acts as a phase shifter, maintains the trigger current. The current through R2, C1 and the gate electrode (G) reaches its maximum value when the voltage across the load passes through zero. This causes the triac to be triggered anew for each half-cycle, even though no pulse is present at the gate. It remains triggered until S2 or S4 is closed, which causes it to return to the blocking state.The load can be incandescent lamps in the station area (platform lighting) or a solenoid-operated device, such as a crossing gate. The LED connected across the output (with a rectifier diode) indicates the state of the flip-flop. 

The schema shown here is designed for use in a model railway system, but there is no reason why it could not be used for other applications. The reed switches can also be replaced by normal pushbutton switches. For the commonly used TIC206D triac, which has a maximum current rating of 4 A, no heat sink is necessary in this application unless a load current exceeding 1 A must be supplied continuously or for an extended period of time. If the switch-on or switch-off pulse proves to be inadequate, the value of electrolytic capacitor C1 must be increased slightly.
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Friday, August 29, 2014

A Pioneer In Their Own Right The Pioneer Car Stereo

Look at any good car stereo system and you’ll probably see a Pioneer car stereo unit plugged into the console. Alongside with quality speakers and a strong lineup of accessories like LCD panels and navigational devices, Pioneer products/Pioneer car stereos have earned a huge following the world over.  

The Pioneer Company is a Tokyo-based corporation, and is one of the world leaders in digital entertainment products. The Pioneer Company was first founded in 1938 in Tokyo as a small radio and speaker repair shop business but today, they are recognized as a leader in technology advancements in the consumer electronics industry.
A
The company is truly deserving of their name. They are respected for many innovations such as interactive cable TV, the Laser Disc player, developing the first Compact Disc player for the car and the first detachable face car stereo, DVD and DVD recording, plasma display, and organic electroluminescent display. Their strength in optical disc and display technology is complemented by its state-of-the-art software products and manufacturing capabilities.

Nowadays, Pioneer car stereo units are not just simple head units. A car stereo can easily be comprised of several items built into the console of the car. Hardware like navigational devices, DVD players with LCD panels, coupled with the standard array of compact disc, mp3 and cassette players now usually go together. One would be hard-pressed not to acquire all of these, as it is such a delight to see these units work harmoniously. But traditionally, a Pioneer car stereo unit is a head unit with a radio, cassette and cd player. No matter how bare-bones this might sound, anyone will surely be impressed with the sound quality and features a Pioneer car stereo can boot.

Something like the DEH-P90HDD Pioneer car stereo single CD player head unit. The DEH-P90HDD allows you to record CD Audio (from the unit itself or from a changer) onto a 10GB hard disc drive, which holds about 200 audio CDs (using ATRAC3 digital compression). Your CDs are recognized by the pre-installed Gracenote CDDB database, which includes auto-playlists that make finding a specific CD easy. This Pioneer car stereo unit can also play your MP3 CDs plus CD Audio, CD-RW, and CD-R discs. Also, the MagicGate Memory Stick player lets you play recorded Memory Stick tracks. The Organic EL display is easy to read and accepts image downloads, so you can customize its look. Built-in DSP offers a 13-band graphic EQ and a huge variety of tools. The DEH-P90HDD is XM Ready and provides a steering wheel remote.   

KEH-P4020
If cassettes are your thing, the KEH-P4020 Pioneer car stereo cassette player head unit is a good product to choose. It is a full logic cassette system with multi-color display, 45Wx4 High Power, EEQ™ equalizer system, Tuner, IP-Bus System Control, flap face and has a detachable face security. 

PioneerIf you’re planning to buy a Pioneer car stereo unit, why not match it with a set of Pioneer speakers too? Pioneer car stereo has made another innovation in their REV Series speakers, which incorporates technological breakthroughs in their IASCA award-winning Premier Reference Series (PRS) speakers. Rev Series speakers boast Pioneer’s Kevlar Fiber Composite Cones, Soft-dome tweeters and Wave guides. Each speaker features a bright yellow cone and distinctive wave guides, plus a six-spoke grill with a titanium finish that simulates chrome wheels.


With all these impressive products, is it still a wonder why they call Pioneer car stereos “Pioneer”?

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Speaker as a mic circuit





This is wonderful schema for you guys.because we can use a normal speaker instead of a mic.When the voice waves touch the speaker.Magnetic field is changed in it.As a result of that it releases small electric signal to the transistor and transistor increase it.you can make this one as a intercom too.Then you have to use two diagram for that.try this...



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Thursday, August 28, 2014

Auto Sound Systems One Piece at a Time

Those who are in the market for auto sound systems are probably well aware of the many decisions that need to be made throughout the process. Gone are the days when you went in, pointed to a box and walked out with all the pieces, parts, and components you would ever need for a really kickin sound. The truth of the matter is that there are many pieces and parts that work together in order to create the ultimate sound system and everyone seems to have different requirements, styles, tastes, and budgets to work with.
Because of this, many manufacturers of auto sound systems have wised up to the fact that some people will buy the components they need to create the sound system of their dreams piece by piece as budgets allow. This is actually a very intelligent way for customers on a budget to buy the sound system they are hoping to some day have. As a result you will find that speakers, amplifiers, sub woofers, and the actual stereo are often sold separately and at very reasonable prices.


Most of us hate living within limited budgets but understand that often in life it is a necessary evil. Living on a budget is not such a terrible thing really. If we had everything we wanted, what on earth would there be to look forward to? At least that is what I keep telling myself. I, however, seem to be the queen of budget living and bargain hunting. I love little more in life than finding a great deal on an item Ive had my eye on for quite a while and hate little more than finding it cheaper once Ive purchased it. As such, I tend to invest a great deal of time researching any major purchase before taking the plunge. A good auto sound system by this I mean good quality, minimal features is going to run (total package and installation) at least $1,000 with many costing a good deal more than that.


That doesnt mean you need to have a thousand bucks lying around the house in order to begin building your auto sound system. You can buy a decent set of speakers for around $200-$260 if you desire. You can find sets at lower prices, but this is the price for a fairly decent set of speakers that should serve you well. Keep in mind that you could very easily spend a lot more than this on speakers if you arent careful. Living on a budget means you have to make some sacrifices along the way in order to have the things you want in life. Buy the speakers and have them installed (if you can do it or your know someone who can, this will save a lot of time and money).

Once you have the first component, whichever one that may be (that choice is entirely up to you and largely dependent on your personal tastes and which need replacing worse in the vehicle you own) you can begin saving towards the next. You should also consider asking friends and family (who would like to know what to get you for the holidays) to help you reach your smaller goals along the way. Most people are glad to help with specific items if they know what those items are. The point is that this isnt an all or nothing proposition. Take small steps towards your prize and you will find that you are constantly getting one step closer.

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Tuesday, August 26, 2014

Build a Precision Top to Top ac dc Converter Wiring diagram Schematic

Build a Precision Top to Top ac-dc Converter Circuit Diagram. Using a CA3140 BiMOS op amp and a single positive supply converts a conventional voltage doubler with two precision diodes into a precision peak-to-peak ac-to-dc voltage converter having wide dynamic range and wide bandwidth. This is the schema. 

Precision Top to Top ac-dc Converter Circuit Diagram

Precision

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Monday, August 25, 2014

Build a Derived Center Channel Stereo System Circuit Digram

A simple method of deriving a center or third channel without the use of an extra transformer or amplifier, (a) 4- speakers are connected to 8- amplifier taps. 8 and 16- speakers connect to 16- taps, (b) By blending the inputs it is possible to cancel out undesired crosstalk. 

Derived Center-Channel Stereo System Circuit Digram
 
Derived
 Read more about diagram diagram
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Build a Home Alarm Loop Wiring diagram Schematic

Every one need security him home to day i share a article about house alarm. How to Build a Home Alarm Loop Circuit Diagram ? This is a simple loop alarm schema , This schema offers open and closed loop contacts (switches 1,2,3) that triggers the alarm ON and stays ON for 5 -10 minutes. The triggering delay (entrance/exit) is 27 seconds. This simple alarm schema Has also a cancel button for resetting the schema to stand-by mode again.It uses 4001 and 4011 gates and one NPN transistor who drives the siren.

Home Alarm Loop Circuit Diagram

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Friday, August 22, 2014

Build a 3V Battery To 5V Dc Dc Converter Circuits Wiring diagram

Build a 3V Battery To 5V Dc/Dc Converter Circuits Diagram. A common power-supply requirement involves converting a 2.4- or 3-V battery voltage to a 5-V logic supply. This schema converts 3 V to 5 V at 40 mA with 85% efficiency. When Ic (pin 6) is driven low, the output voltage will be the battery voltage minus the drop across diode Dl. 

The optional schemary that uses CI, R3, and R4 lowers the oscillator frequency when the battery voltage falls to 2.0 V. This lower frequency maintains the output-power capability of the schema by increasing the peak inductor current, which compensates for the reduced battery voltage.

3V Battery To 5V Dc/Dc Converter Circuits Diagram

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Tuesday, August 19, 2014

Make A Virtual Phone Battery

Virtual cell phone battery is a replacement cell phone batteries for those of you who use the phone as a modem. Including myself, who use the phone as a modem HAIER d1200p internet.  Why must use this virtual battery. For those who surf hobby "full time" with a phone modem, would know the problem, the battery gets hot and fast reply wasteful even worn out.
virtual
This tool is a good solution to keep and care for our cell phones from the possibility of damage from over-charging its battery.I created a virtual battery works as follows:We take the source of its power supply from the USB port because the port is very easy and simple to use and simply provide a standard current source when the phone is online (500-750mA).

The workings of the circuit is as follows:Diodes or diode 2Amper in 5239 this standard to provide a useful addition to the polarity of the voltage which is also a component of protection against misuse. You can just use a 1 Amp diode (IN4002-4007). I use the IN 5239 is due to be durable, more resistant to heat.4v3 zener diode IN4007 and configured to create a portal voltage of 5V (4.3 + 0.7 volt zener Vin4007) and is useful as a protection system against possible voltage spikes in the event of damage to the CPU.220nF capacitor as a stabilizer and a substitute for the original battery cells.

The following also 100pF capacitor to smooth and filter the dc current through the diode 5239 which came out of the induction logging.Configuration between zener4v3, IN4007 diode and C 220n form a cell replacement from the actual battery cells, because the battery was actually a capacitor which had a large capacity.You can just remove the three components mentioned above. although it can work fine .

But results are not as good as that use virtual cell (replacement), which certainly was the security which we have to think to avoid the things which are not in want.Making way is to use an old cell phone batteries which have been wasting his cell, a raft of this circuit and the solder terminals on the batteries with the polarity distinguished. Make two holes for the cable to the jack / USB jack.

 Determine the length of cable required to taste and use stranded cable with a diameter of at least 1mm.If some type of cell phone batteries are very thin, use a small box for this circuit and connect the two wires to the output voltage again for hp battery casing. Or also if you do not have a former battery casing, use alligator clips to the battery terminal on the phone .. Pin the middle of the virtual pin replacement battery is BSI (Battery Size Insdicator) is useful for HP Nokia.
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Sunday, August 17, 2014

Build A Pulse Train Wiring diagram Schematic

Build a Pulse Train Game Circuit Diagram. This schema has a rate multiplier using a 4093 Schmitt trigger as an oscillator, driving a 4017 decade counter. When a pulse present at the input (to C2) 4017 is reset, output zero goes high, and outputs 1 to 9 go low. The oscillator (4093) starts running and the 4017 counts the pulses until the 4017 output (1 to 9) connected to pin 1 and 2 of the 4093 goes high. The oscillator is inhibited and the output remains high until the next input pulse. Source Link

Simple Pulse Train Circuit Diagram

Simple
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