Originally recommended to give a tone of transmission in equipment of the 60s (tubed) this circuit is based on a neon lamp.
This 5 V x 8 A power supply was found in Siliconix documentation. The unit operates with a 24 to...
Found in a European magazine from the 90s, this circuit emits beeps that are several seconds apart to...
This circuit uses BCD switches to program the frequency to be divided. The circuit is from a Radio...