This circuit appeared in Amateur Radio Today in an issue and was found in a 1995 issue. The circuit is for the AM band up to 3 MHz. The transistors are general-purpose.
This code key uses a PLL and an oscillator that generates two frequencies that must be recognized for...
This circuit was used to regulate the speed of small DC motors of cassette recorders. However, if the...
This circuit turns on the relay 12 seconds after S1 is closed. The time is given by C1. The...