This circuit was found in 1967 Philips documentation. It uses transistors from that time. Transistors can be replaced with modern equivalents.
This simple CMOS touch switch was obtained in a 1987 publication. All components are common and the...
This circuit is from a current regulator up to 1 A, ie a constant current source. The LM320...
Found in a Popular Electronics from the 90s, this circuit reaches 100 kHz and battery power is...