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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

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Radio Frequency (RF) Oscillators

175Khz Inductive Pulse Receiver  -  This circuit is discussed in more detail in the Experimenters Journal. The receiverís six inch diameter coil detects the ring signal from the above transmitter and use a single NPN transistor to provided enough amplification for the signal to be easily viewed on an oscilloscope . . . [Circuit by David Johnson P.E.,  06/29/00]


240VAC to 5VDC Power Supply  -  This is simple way to power some 5v logic from a 240vac source.  If a 120vac power adapter is used, the circuit will also work for 120vac power lines . . . [Circuit by David A. Johnson P.E.,  02/12/02]

CMOS Inverter Parallel LC Oscillator  -  I have used this parallel resonant LC oscillator circuit countless times.  The oscillator frequency is determined by the inductor and capacitor values.  I have shown an adjustable inductor to make it easy to set the frequency to a specific value . . . [Circuit by David Johnson P.E.,  03/12/02]


Inductive Pulse Receiver (175Khz)  -  This circuit is discussed in more detail in the Experimenters Journal. The receiverís six inch diameter coil detects the ring signal from the above transmitter and use a single NPN transistor to provided enough Amplification for the signal to be easily viewed on an oscilloscope . . . [Hobby Circuit designed by David Johnson P.E.,  06/27/00]


Parallel LC Oscillator with CMOS Inverter   -  I have used this parallel resonant LC oscillator circuit countless times.  The oscillator frequency is determined by the inductor and capacitor values.  I have shown an adjustable inductor to make it easy to set the frequency to a specific value . . . [Hobby Circuit designed by Dave Johnson P.E.,  03/12/02]


More  Radio Frequency (RF) Oscillators

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The circuits on this site are designed by David A Johnson - unless otherwise noted.  David A. Johnson & Associates.  All Rights reserved. 
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