Showing posts with label electronic. Show all posts
Showing posts with label electronic. Show all posts
Tuesday, January 6, 2015
Electronic Timer with display circuit
Using this electronic scheme can be built an electronic timer which can be set to measure a maximum of 60 hours.
The electronic timer allows the fixation of some intermediate time. On reaching this point, a buzzer will sound.
The circuit is built using ICM7217 integrated circuit, manufactured by Intersil, which contains a CMOS counter up / down, with 4 digits and display properly.
Tuesday, October 28, 2014
IC RD15HVF1 bassed RF amplifier electronic Circuit diagram
This RF amplifier electronic project circuit is designed for 525MHz frequency band . This RF amplifier electronic project is based on the RD15HVF1 MOS FET type transistor specifically
designed for VHF/UHF High power amplifiers .
This RD15HVF1 rf amplifier circuit project can provide a maximum High power of 15 watts and a gain power more than 7dB using few external electronic parts . This amplifier circuit project must be powered from a 12 volts dc power supply .
C1 capacitance must have a value of 10uFand must be formed from 2200pf capacitors connected in parallel . C2 capacitor must be formed from two capacitors of 2200pf connected in parallel . C3 capacitance must have a value of 330uF and must be formed from 2200pf capacitors connected in parallel . L1 L2 and L3 coils must be formed from 1.6mm silver plateted copper wire on a diameter of 6mm . L1 must have 4 turns , L2 must have 2 turns and L3 must have 4 turns .
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As you can see in schematic circuit , this electronic project based on MOS FET type transistor require few external electronic parts .
designed for VHF/UHF High power amplifiers .
This RD15HVF1 rf amplifier circuit project can provide a maximum High power of 15 watts and a gain power more than 7dB using few external electronic parts . This amplifier circuit project must be powered from a 12 volts dc power supply .
C1 capacitance must have a value of 10uFand must be formed from 2200pf capacitors connected in parallel . C2 capacitor must be formed from two capacitors of 2200pf connected in parallel . C3 capacitance must have a value of 330uF and must be formed from 2200pf capacitors connected in parallel . L1 L2 and L3 coils must be formed from 1.6mm silver plateted copper wire on a diameter of 6mm . L1 must have 4 turns , L2 must have 2 turns and L3 must have 4 turns .
Monday, September 8, 2014
Electronic Security Door Key Wiring diagram Schematic
A different Electronic Security Door Key Circuit Diagram of electronic lock very simple, one and does not need a lot of materials in order to it is manufactured. The right keys of code should be stepped with the right line, so that is activated the optocupler IC2. If from error is stepped switch that does not belong in the combination, then the lock is trapped. In order to we restore the regular operation of lock, it should we press switches S1 or S12.
Electronic Security Door Key Circuit Diagram
Switch S1 makes Reset of lock externally and the S12 internally, the door. The Code the schema as he is connected it is 147 and it can change, very easily, changing the connections in the switches of keyboard. The optocupler IC2, can drive any exterior schema as Relay etc, ensuring simultaneously electric isolation the two diagram. The schema can be also supplied from a battery 9V.
Part List
R1-7-9=1Kohm
R2-3-4-5=100Kohm
R6 =10Kohm
R9 =47Kohm
IC1 = 4066
IC2 =4N25
Q1-2=BC550
S1...11=Push button sw or keyboard
S12=Push button normal closed
All resistors is 1/4W 5%
Saturday, September 6, 2014
Electronic Siren Circuit
This is the schematic diagram of electronic siren schema. The sound produced imitates the rise and fall of an American police siren. When very first switched on, the 10uF capacitors is discharged and each transistors are off. When the push button switch is pressed to 10uF capacitor will charge via the 22k resistor. This voltage is applied towards the base of the BC108B which will turn on slowly. When the switch is released the capacitor will discharge via the 100k and 47k base resistors and also the transistor will slowly turn off. The change in voltage alters the frequency of the electronic siren.
Electric current drain is fairly high in this electronic siren schema so a appropriate power supply is needed. The duration the tone takes to rise and fall is determined by the 10uF and 22k resistor. These values may possibly be varied for various effects.
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