Darkness Monitor (CB21019E)

Found in Popular Electronics this circuit triggers an SCR and lights an LED when the location of the sensor is dark.

| Clique na imagem para ampliar |

Balance indicator for stereo (CB9107E)
This circuit was found in Electronics Today International of the 80's. The circuit uses still...
FM Oscillator with Varicap (CB21143E)
Found in an Electronic Design, this circuit is intended to produce signals in the VHF band. The...
15 W Amplifier using the TDA3000 (CB430)
This circuit uses a not easy to find IC these days. The circuit sources 15 W to a 4 ohm load and...