This circuit was found in a 1967 RCA manual. The transistors are of the time. The adjustment is made to read 7.15 V on the charged battery and the charging current is 3.2 A.
This circuit allows the use of headphones and microphones with diverse characteristics in audio...
This amplifier with an OTA has a gain of 40 dB. The power supply must be symmetrical. Found in...
Found in a Linear Technology 80s integrated circuit manual this circuit has its gain controlled from...