This longwave signal booster circuit was found in the 1995 Encyclopedia of Electronic Circuits Volume 5. Note the dimensions of the board. The transistor is a general-purpose transistor.
This circuit consists of a speed regulator for direct current motors. The integrated circuit used...
When the sensor of this circuit is cut for a moment, the second 555 produces a tone for a time...
This circuit for generating precise reference signals was found in the April 1973 issue of Radio...