This NEC commercial amplifier was manufactured in Japan in the 1960s. The circuit uses 4 transistors from the time and was powered by a 9 V battery voltage formed by large batteries.
This application consists of a circuit that trips when the sensor resistance drops below a few...
A negative floating regulator capable of supplying an output voltage of -100 V with regulation of 20 mV for...
This circuit was found in a 1977 Radio Shack documentation. The circuit is TTL, which must be...