This circuit was found in an English publication from the 70s, an article that teaches how to calculate instruments. The circuit is still current and can be built with an analog indicator of 100 uA.
This circuit produces a single pulse whose duration depends on the capacitor. The circuit is from an...
This circuit shows how a simple one-transistor stage can be used to Power high current loads from...
Using the well-known CK722 and also the CK721, this signal follower or tracer was found in Radio...