50 kHz optical receiver (CB20690E)

This circuit for light modulated in frequency (FM) was found in documentation of the 90s. SUS is uncommon today, but transistors admit equivalents.

| Clique na imagem para ampliar |

Signal injector (CB21554E)
The CK722 transistor used in this circuit is one of the first commercial types in the world. The...
Automatic Dimmer (CB18864E)
This automatic dimmer for incandescent lamps was found in a European publication from the 1980s. The...
Voltage doubler with 555 (CB1230E)
This traditional doubler configuration with the 555 can be found in other articles on the author’s site....