This circuit was found in an Electronics World of 1968. Its purpose in triggering a relay when the circuit receives signals from a vibration sensor. The circuit is used in emergency situations.
Designed for the audio track, this circuit was found in a Popular Electronics from the 90's. Other...
We found this circuit in Radio Electronics magazine from June 1960. The four-transistor circuit is...
This high gain circuit is from 1969 General Electric documentation. The transistors are of the...