This circuit is from the 1990 Motorola Data Databook. The circuit can be implemented with equivalent transistors. The power supply must be symmetrical.
This circuit converts pulse frequency to current, which is indicated on an analog instrument. The...
This relay circuit with a dual channel MOSFET (not very common today) was found in an old American...
In the figure we have a simple signal tracer circuit to be coupled to the volume control of an AM...