Found in na 1980’s English magazine, this circuit produces a strong modulated tone reproduced on a speaker. The power MOSFET can be of almost any type.
With this luminous remote control, which we found in a 1990 publication, using a flashlight you...
We found this circuit in a 1967 Electronics World. The circuit can be designed to control other...
This circuit can be used in a signal level indicator with LEDs. The circuit is from an Electronics Now...