This simple circuit causes an LED to flash at times whose active cycle is determined by C1 and C2. Transistors can be BC548.
In the figure we have a typical polarization circuit for MOSFETs with a high impedance...
This equalizer was found in the May 1978 issue of Radio Electronics magazine. The component values...
Found in a 1980s American documentation, this crystal-controlled oscillator generates 100 MHz...