Liquid Crystal Watch (CB19860E)

This watch uses a liquid crystal display. The circuit is from the 80s and the module used is uncommon nowadays. Power is provided by a single cell.

| Clique na imagem para ampliar |

1-Transistor Amplification Stage (CB19877E)
This stage with polarization of only one resistor can use any general-purpose transistor. The...
Optical potentiometer (CB22159E)
This voltage-controlled potentiometer using an LDR was found in an English documentation. LDR is...
Spy Detector (CB25214E)
This interesting sensor for RF signals was found in an article in the June 1989 Radio Electronics...