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 |

Unijunction Metronome (CB12281E)
This circuit is from a 1991 publication, but it can be assembled with more modern components. We...
Precision Current Source (CB14078E)
This circuit provides a current given by the components calculated according to the formula next...
Audio Booster (CB23540E)
Published in Radio Electronics in October 1963, this circuit increases the audio output of a small...