We found this circuit in an 80's manual. The same configuration can be adapted to make use of modern operational amplifiers. The power supply is symmetrical.
The circuit presented uses an integrated circuit Sanyo, not very common in our day. This amplifier provides...
This 80's circuit uses a light-sensitive SCR or LASCR and a one-sided silicon switch SUS, uncommon...
This circuit is from an old documentation making use of a 3,579,645 MHz analog color television...