Micro amplifier (CB23672E)

This three-transistor circuit was found in Radio Electronics magazine from May 1969. The circuit is for hearing aids and has earphone listening.

| Clique na imagem para ampliar |

JFET Sample and Hold (CB5955E)
The operational amplifier is old. The circuit is from an 80's documentation but can be designed...
Multiple delay pulse generator (CB8200E)
This configuration, explored in other applications of this section and website, was found in a 90s...
Rain Indicator (CB12392E)
The sensors can be screens having porous tissue between them. When the water moistens them, the...