Suggested by Mullard in a1969 documentation, this circuit generates the erasure signal for tape recorders of the time. Transistors can be modern equivalents like BD136 and BD136.
The purpose of this circuit is to trigger an oscillator with the light of dawn. The tone of the...
We found this circuit in an English publication in 1976. The circuit is based on the use of a...
This interesting automotive alarm was found in a 90's Popular Electronics. The circuit uses...