This TTL circuit was found in the December 1990 issue of Radio Electronics magazine. The circuit has a 50% duty cycle. It must be powered by 5 V.
This oscillator, with an old operational from the 80's, was found in an American publication of the...
This 1965 Philips circuit uses old company transistors like the BFY51 and BFY50. The circuit is...
This is the receiver for the earlier system published in the August 1988 Radio Electronics...