This circuit detects changes in the active cycle of the input signal. The circuit was obtained in a 1966 EEE. Transistors are general purpose types of the time.
This configuration is from a 1964 US documentation valid for any FET. The range of power voltages...
We found this circuit in a Popular Electronics of the 90s. The circuit uses a touch sensor formed by...
This circuit was found in a 1967 Electronics World. We can design it with a BF245 for the FET and a...