VLF Converter (CB7326E)

Found in a 303 Circuits from the 90s, this circuit converts signals from the 10 kHz to 150 kHz band to the 4.01 to 4.15 MHz band.

| Clique na imagem para ampliar |

Relay Drive AC Stage (CB12182E)
With this circuit, a relay can be activated from an alternating signal with frequency up to a few...
Visually Impaired Electronic Guide (CB18123E)
With this circuit the visually impaired can easily locate important places inside the house, such...
Schmitt trigger (CB21475E)
In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The...