This circuit can detect static charges or extremely low voltages. The circuit was found in ancient American documentation and makes use of a JFET. A BF245 which is a more modern transistor can be used.
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...