Silent Alarm (CB6444E)

This circuit simply triggers an LED when the sensor is activated. The circuit is from a Popular Electronics of the 90s.

| Clique na imagem para ampliar |

LM3900 Buffer (CB14186E)
We found the configuration below, with unit gain, in the National Semiconductor Linear...
Proportional temperature controller (CB21277E)
This circuit is from an Electronic Design from the 90's. The main integrated circuit is uncommon...
Active Low Pass Filter (CB20091E)
This circuit appears on this site from different sources. This is from documentation from the...