Amplifier with different output (CB9057E)

This circuit was found in a 70s National Semiconductor manual. It has a different output way for coupling to the speaker.

555 Timer with Triac CIR24360S (CB24404E)
This circuit for AC loads was found in February 1976, Radio Electronics magazine. The triac is...
Tunable Simple Oscillator (CB4931E)
We found this circuit in an old documentation, using an operational of the time. The circuit...
Brake Light (CB929E)
This very simple brake light circuit is activated with the brake lights, just connecting it by...