We found this good amplifier in a Japanese publication of 1966. Transformers are uncommon nowadays and the power supply is included. Power is a few watts.
The LM143 integrated circuit is a high voltage operational amplifier from National Semiconductor that is...
This power supply can provide 10 A currents. Its regulation is made by 7812 integrated circuit. The...
We found this circuit in the November 1992 Radio Electronics magazine. It works with both...