JFET VCO (CB21133E)

This circuit was found in a Popular Electronics from the 90's. The frequencies depend on the components indicated in the table next to the diagram.

| Clique na imagem para ampliar |

Dual trace for oscilloscope (CB5438E)
This circuit shows on the screen of an oscilloscope two signals alternately at a frequency that depends...
Shield for isolated motor (CB25494E)
This circuit is from a Radio Electronics from August 1992. The transistor used allows the control of...
Audio voltmeter (CB22308E)
This circuit measures the strength of audio signals. We found it in an American publication from...