6AC7 Amplifier (T450E)

Obtained in MIT documentation, this 4-stage circuit has high gain for small signals. The power supply sources 150 V.

Multiplexed AD Converter (CB9023E)
This 8-channel converter was found in a 1970s American documentation. The integrated circuits used are...
Sound Effects Generator (CB17012E)
This circuit is from a 1995 documentation. Several CMOS integrated circuits are used to produce...
Automatic lamp control (CB6847E)
Found in Radio Electronics, this circuit is intended to activate the lighting system of garages...