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Circuits designed by David Johnson,
P.E.
Last Updated on:
Thursday, March 22, 2012 06:08 AM
Master Category List -
Dave's Circuits
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Wave
Shaping Circuits |
- VIDEO SIGNAL EDGE
ENHANCEMENTS
I designed this circuit many years ago, based on the claims that the
technique would improve the quality of standard TV images. The circuit adds
information to the edges of the objects and was reported to bring out more
detail. After building and testing the circuit, I could definitely see a
difference between it and a regular TV display but I don’t think most people
would go to the trouble of installing the circuit for only a marginal
improvement. Still, it is an interesting circuit with which someone might
experiment.
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- ULTRA PURE 125KHz
SINE WAVE SIGNAL SOURCE
For some RFID systems operating at 125KHz, a very low distortion signal source
reference is needed. The circuit shown on this page produces a 10-volt
peak-to-peak signal into a 50-ohm load, with a distortion of only 0.01%.
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