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This variable frequency oscillator was found in an old American documentation. Transistors allow more modern equivalents and coil data are found next to the diagram for several frequency bands.
This circuit uses a 4020 counter that divides the frequency up to 210, being found in a former...
In the figure we have the simple way to use a low current switch or sensor to drive a high power...
This circuit can be used as a shield. Its purpose is to detect the positive front of a signal...