Battery Charger (CB6394E)

We found this circuit in a 1968 Electronics World. The potentiometer should be set to trigger the SCR when the battery is fully charged.

| Clique na imagem para ampliar |

FET Tone Control (CB14142E)
This tone control with high impedance input was found in the Linear 1994 Applications Handbook by...
TTL Who is the fastest (CB4884E)
This 4-competitor TTL speed game was obtained in a 1980s documentation, but can still be easily...
Light transmitter (CB8786E)
This receiver for an audio link by modulated light was found in a 90s Elektor. Transistors are common...