This circuit is temperature stabilized. Modern equivalent transistors can be used, and the power supply can actually be between 9 and 12 V. The circuit is from an old documentation.
We found this circuit in a 1992 magazine, but it can be easily assembled today because the...
This traditional configuration was found in a 1988 publication. Its gain depends on the base...
The power of this small amplifier reaches 75 mW per channel depending on the voltage and the load...