555 Code Oscillator (CB26324E)

Found in a 1990s Popular Electronics, this circuit produces a tone on a small speaker. The keyer directly controls the power supply.

| Clique na imagem para ampliar |

Triac Dimmer 1 (CB20703E)
Found in documentation from the 1980s, this circuit is used for resistive loads (incandescent...
Three-decade VCO (CB20829E)
We found this circuit in a documentation from the 90s. The integrated circuits are from the time,...
AC Inverter Amplifier LM3900 (CB25166E)
The figure shows how to implement an inverter amplifier with a Norton operational amplifier. The...