This circuit is from an article about operations in a Radio Electronics magazine from around 1968. The transistors are types of the time and the power is not the greatest.
Found in an Electronic Design from the 90s, this sophisticated continuity tester uses operational...
The circuit in the Multisim Blue simulation sources a regulated voltage to loads up to 50 mA. The...
Found in American documentation, this simple circuit activates a buzzer with embedded oscillator. A...