Showing posts with label class. Show all posts
Showing posts with label class. Show all posts
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 :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
Tuesday, October 28, 2014
TDA2009 Stereo Hi Fi Class AB Power Amplifier
The IC TDA2009 Stereo Hi-Fi Class AB Power Amplifier circuit design with the intention of looks parallel to the IC 8W +8 W stereo amplifier circuits of the earlier tape.But it pray adjust the IC amplifier in the same way as a figure TDA2009.inside the IC in support of circuit amplifiers, Hi-Fi rank AB. And output terse circuit protection sectors as well.But nearby will be present changed according to the properties of the IC. The TDA2009 IC is to qualify from the power supply 8-24 volts, the current most of 1-2 amp.An output voltage watt 10 watt 24 volt load 4 ohms, 0.351% distortion by a frequency 1 kHz, frequency response from 10 Hz-50 kHz by -3 dB to 36 dB of grow and the strength. input make signs by 100 mV.
 |
| TDA2009 Stereo Hi-Fi Class AB Power Amplifier Circuit Diagram |
While raising the power supply circuit and input into the audio input.The audio input gone channel and absolute channel. desire it perform the same.So I explained the values of the missing channel merely lone box.gesticulate through C1 meant for protection dc stimulating To interfere with IC.
at that time liveliness to the input signal to pin 5 of IC.The non inverting pin wish not reach to time signals. The output from pin 8. Through C8 and to prevent DC and raise the low frequency response the better,so therefore sent to the spokesman.The C10 and C11 act to filter the light to look after the smooth sound
Monday, August 25, 2014
2x110W AF power amplifier class AB 2 channels
Circuit Diagram:
 |
| 2x110W AF power amplifier class AB 2 channels |
Subscribe to:
Posts (Atom)
