This circuit was obtained in a 1964 Electronic Design. Equivalent modern transistors can be used. The circuit requires a 6 V symmetrical power supply.
This circuit allows the use of headphones and microphones with diverse characteristics in audio...
We found this circuit in the 1994 Linear Applications Handbook from National Semiconductor. The...
This circuit was found in Radio Electronics from the 90s. The transistor is for general use. The...