Mechanical TV Troubleshooting, Part 4

Mechanical Television Troubleshooting

Negative pictures. Your amplifier is producing the wrong phase at your display. If your transducer is a diode, you can sometimes correct this problem by inverting the diode. If you use a phototransistor, then you'll need to alter your input circuit. Switch from a common-emitter to a common-collector circuit, or vice versa. Alternately, apply the same principle to the display circuit. A third way to achieve the necessary phase shift is to add a one-transistor inverter to your preamplifier.

•URL: http://www.hawestv.com/mtv_trouble/mtv_tsneg.htm • Webmaster: James T. Hawes • Revised -- November, 2004
•Created by the author primarily in HTML & Notepad •Also used: Word 98, Explorer & FrontPage 98 •Disclaimer: The author assumes no responsibility for your success or failure in using methods described on these pages. Further, the author neither makes nor implies any warranty or guarantee as to the accuracy or effectiveness of these methods. Proceed at your own risk.