TTL Oscillator (CB21119E)

This 1 kHz TTL oscillator uses 3 inverters of a 7404 integrated circuit. The circuit is from a Popular Electronics from the 90s.

| Clique na imagem para ampliar |

LED Binary Counter (CB4345E)
This circuit came out in an American magazine that no longer exists. It's the Electronic...
Code Switch (CB10287E)
This circuit originally came out in a Budget Electronics from 1981. The American magazine no...
LM382 Preamplifier (CB15083E)
This is the traditional audio preamp configuration with the National Semiconductor LM382. The...