This electronic Morse Key for telegraph message transmission was found in an American 1980s amateur radio documentation. The circuit uses TTL technology and must be powered by a 5V voltage.
This interesting sound effect circuit that produces the sound of bulls or Bull Horn was found in...
April 2017 - The new MEMS DSC600 oscillators with Microchip technology are in stock at Mouser...
This page shows a crystal oscillator for 2 MHz. Other frequencies can be produced depending on the...