This simple signal generator with transistors was published in Radio Electronics magazine in November 1957. The circuit generates signals determined by the coil and modulation by the transformer.
This circuit was found in an American documentation from the 90's. The circuit can use almost any...
This circuit triggers a relay when light strikes a sensor. The sensitivity is adjusted in the...
We found this circuit on the internet, but it has some problems. It will be convenient to limit the...