Solid State Guitar Amp Forum | DIY Guitar Amplifiers
Solid State Amplifiers => Amplifier Discussion => Topic started by: Fossilshark on June 12, 2016, 12:46:36 PM
Im using the single transistor preamp with this 3 transistor amp circuit as a power amp. It works but its not good, im hearing radio signals, and alot of distortion. Whats wrong?
Update: amplifier very quiet, transistors heating up, and distortion only at high volumes.
The Voltage at the minus side of C1 should be half the 9V battery Voltage. If the Voltage there is too low, increase the resistance of R2. If the Voltage there is too high, decrease the resistance of R2.
If Q1 and Q2 are too hot, install a resistor across one of the diodes, D1 or D2. Try a 1K or 470 Ohm or go lower until Q1 and Q2 cool off.
This circuit is too simple. It won't work at all 99% of the time. If it does work, performance will not be very good. An LM386 is easier to use and will work most of the time without adjusting any resistors.
The preamp is another crappy circuit. Find something else.
Haha i kind of figured as much. Im actually trying to find a simple transistor circuit to replace an lm386 i have. I need something with a little more power then the 386 puts out, mabey 2 watts. Is this achievable with 3904/3906 (all i have on hand) or will i have to bite the bullet and invest in some more powerful trannies.