This very low power amplifier is designed by Amperex for hearing aids. It is based on TAA370 which is not an integrated circuit that can be found today.
I found this circuit in a documentation about thyristors from the 70s. The circuit uses a diac...
This circuit was found in the 1967 RCA SCR manual. The circuit generates approximately 300 V at a...
The figure shows how to implement an amplifier with gain 10 using the operational amplifier LM41....