This power source for Gas Laser was obtained in a 90’s Electronic Design. The circuit uses a switched regulator from the time. Equivalents can be used.
We found this circuit in a 90's Radio Electronics. The low power circuit activates a 12 V relay...
This circuit was found in a Hands On Electronics from the 80's. The circuit emits an audible alert...
This is a voltmeter with high input resistance. The transistor is germanium. We found it in an...