This indicator or logic probe was found in the April 1979 Radio Electronics magazine. The integrated circuit is the 555 and the FET can be any general-purpose type.
This circuit was found in a 90s European documentation. The circuit already includes a powerful...
This circuit outputs a signal modulated by a unijunction oscillator. The circuit is from a Radio...
This configuration, which uses a transistorized circuit in the feedback, provides a logarithmic response...