In the figure we have a way of receiving ultrasonic signals of a single frequency using a PLL 567. The circuit is from Radio Electronics from November 1985.
April 2017 - Texas Instruments' new high-precision TMP468 sensor can now be obtained from Mouser...
We found this circuit in the September 1971 Radio Electronics magazine. The SCR can be any of the...
This 80's circuit uses germanium transistors like the AC125, AC151, AC163, 2N506 and others to...