Water Level Monitor and Control (CB6271E)

This circuit was found in an 80s Hands On Electronics. It senses the water level in a reservoir by driving a pump when needed.

| Clique na imagem para ampliar |

Solar Telegraphic Transmitter (CB4054E)
This telegraph microtransmitter for a frequency determined by the coil and the crystal was found...
6 or 12 V Sequencer Using a SCR (CB479)
Using this circuit the lamps glow in sequence in a speed given by the capacitors. The SCRs present a...
SCR Astable (CB6804E)
This circuit was suggested by a 1967 General Electric manual. The waveforms of the generated...