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.
In the figure we have the way to connect two high power operational amplifiers LM12 to double the...
This two-channel bargraph meter uses a single KAA2281 integrated circuit. Found in the January 1991...
This circuit was found in a Raytheon manual from the 60s. The transistor is the CK722, one of the...