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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.
Using the well-known SAA1027, this circuit serves as interface for PC. No English documentation was found...
This speed control for small DC motors can operate from 6 to 12 V sources. The motors can drain...
We found this transformer-isolated control circuit in a June 1995 Electronics Now. The triac must...