Suggested by a 1990 book for amateurs, this circuit makes use of an integrated component that is not common today. It converts signals from one band to signals in a 10.7 MHz band below.
This circuit is from a technical documentation from the 70s. It makes use of married transistors in a...
This strobe light circuit with incandescent lamp was found in a 1978 publication. We can mount it with...
This circuit produces a square wave signal with the frequency determinated by R1 and C1. The upper limit...