B21126E)
This circuit was taken from an old Popular Electronics. The circuit can have its frequency changed from an external signal. The center frequency is given by C1.
Found in a 300 Circuits from the 90s, this circuit can deliver a maximum current of 50 mA. The...
In the figure we have the way to control a triac with a low current and low voltage switch,...
This circuit generates sinusoidal signals that depend on the input oscillator. The circuit is from...