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S-Meter repair?
KR6LP - Lake Perris QRP Society
Another approach using Paint Shop Pro http://www.qsl.net/kr6lp/meter.html Backlighting with an LED (S-meter) http://www.pan-tex.net/usr/r/receivers/elrsmeter.htm |
S-Meter repair?
W9GB wrote:
KR6LP - Lake Perris QRP Society Another approach using Paint Shop Pro http://www.qsl.net/kr6lp/meter.html Backlighting with an LED (S-meter) http://www.pan-tex.net/usr/r/receivers/elrsmeter.htm I find LED backlighting an interesting topic in itself. When attempting to replace the burned-out grain-of-wheat lamps in my Kenwood TS-120S with LEDs, I found the dispersion angle such that it didn't illuminate the entire scale -- only a spot in the middle. A friend (service manager for a local pro sound dealer) then mentioned, "just grind or file the lens on the LED, and the dispersion angle will increase a lot". The next time I need to replace lamps, I'll do that. Also in regard to LED backlighting, I learned that not all white LEDs are created equal. Most emit a bluish-white light, and are rather pricey compared to other colors (even compared to blue LEDs). Just this week, in refitting a ring light for a microscope with white LEDs where I work, I found a pretty good lamp that's handled by Mouser (http://www.mouser.com/). It's called a "warm white" LED, T1¾ package, and is only $1.00/ea. Search for stock #889-LM560. Vy 73, Bryan WA7PRC |
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