Tachometer with feedback control (CB9350E)

This circuit was found in Philips documentation from 1965. No information was given about the transformer. Transistors are from the era.

| Clique na imagem para ampliar |

Headlight Time Relay (CB6378E)
This circuit is from an Electronics World of 1967. The circuit slows down the activation of a...
Simple Metal Detector (CB5335E)
This metal detector circuit uses an AM radio as an indicator. The radio is placed off-station and tuned...
a Photodiode Amplifier with Trigger (CB4579E)
In the figure we have a sensor circuit that makes use of common transistors and a photo diode as...