This circuit with 4 transistors can receive signals in 6 shortwave bands. The circuit is from a Radio Electronics from May 1958. The output is for high impedance headphones.
This article is old, from 1994. But, for those who have an old PC and want to use a joystick from...
This flasher for power loads such as lamps and LEDs uses a 555 as an oscillator. The supply...
The output current is of the order of 100 mA maximum, but the transistor used can be changed for...