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Wave-Shaping Circuits
Last Updated on:  Saturday, August 30, 2014 10:28 AM


Circuits Designed by Dave Johnson, P.E. :
  • 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 donít 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.

  • 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%. 

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
Edge Detector Runs off of Single Supply -  12/04/97 EDN-Design Ideas....You can use a single-supply circuit to generate a pulse on both the rising and the falling edges of a signal for use with counters or similar devices that require only a rising edge to trigger (Figure 1a]. R1 and.Ö [Design Idea by Mike Nelson, Polaris Communications Inc, Portland, OR]
Minimum Mass Waveform Capture & Display -  The result was a project that includes a waveform capture circuit, a graphic LCD (Liquid Crystal Display) and a control panel with LED indicators. The details of the Graphic LCD display unit, composed of the LCD module, a serial interface, and bias supply were published earlier on this site,....(schematic / circuit added 6/07)

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%.... [Designed by David A. Johnson]
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 donít 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. Ö. [Designed by David A. Johnson]
Waveform Conversion -  sine to square and square to sine / The system designer is often called upon to convert a sine wave from an oscillator, power splitter, or other RF device into a square wave suitable for driving a logic device. There are numerous acceptable techniques and the best choice will depend upon several factors including the operating....

Wave-Shaping Circuits

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