741 Stereo PreAmplifier Circuit Diagram
This preamp circuit provides better than 20dB gain in each channel.
| PARTS LIST | |
| R1 – R6 | 47kΩ |
| R7 | 1MΩ |
| R8 | 1MΩ |
| R9 | 2.2kΩ |
| R10 | 2.2kΩ |
| C1 | 0.1µF |
| C2 | 0.1µF |
| IC1, IC2 | LM741 |
A better op-amp type will give a better noise figure and bandpass.
In this circuit the roll-off is acute at 20000 Hertz.
 |
 |
Please send your ideas, which are very important for our success…
#1 by NRV90 on April 13th, 2013
Hi!
How can i control the gain of the amplifiers? I want to use a potentiometer. Which resistance would I have to replace with it?
#2 by Ash White on August 19th, 2012
Hello
thanks for this.
A couple of questions :
1.> Can 1x 1482 OP AMP be used instead of 2x 741 OP AMPs?
2.> What line out voltages will this produce, assuming this is used in a car with +12V power supply? Most power amps are looking for up to +5v line in signals. Want to make sure this isn’t going to blow the amp before I build.
Many thanks
Ash
#3 by fgdss on September 25th, 2010
first post