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.
Found in a Westinghouse Silicon Power Handbook from the 60s, this circuit makes use of period...
We found this circuit in a 1964 Electronic Design. The components are from that time, but the...
This 2.5 A power supply was found in a 90's QST magazine. The power transistor must be mounted on a...