Using a 4046 PLL this circuit generates rectangular signals in three wavebands that depend on the capacitors used. The circuit is from a Radio Electronics from December 1989.
This transmitter for the FM band was found in a 1993 spy documentation. The coil consists of 2 + 4...
This circuit charges a battery to power a flashlight at night. The circuit is from an English...
In the proposed circuit, each pulse of light or infrared radiation that hits the photodiode...