While stuffing a BOM with Mouser part numbers for a prototype order I found that pretty much all the multi-turn trim-pots were in stock. Except for the transparent ones. None, zip. Arrgh.How can that be? I was wondering why anyone would want to use a non-transparent trim-pot where you cannot see the position it is in. So the demand for transparent ones should be a lot higher.-- Regards, Joerg

"So rare. So rare."Wasn't that a top ten tune hit from the late '50's ?:-) ...Jim Thompson-- | James E.Thompson, P.E. | mens || Analog Innovations, Inc. | et || Analog/Mixed-Signal ASIC's and Discrete Systems | manus || Phoenix, Arizona Voice:(480)460-2350 | || E-mail Address at Website Fax:(480)460-2142 | Brass Rat || | 1962 | I love to cook with wine. Sometimes I even put it in the food.

This is frustrating. I'm on a dynamic IP, so every time I reboot I have tolog onto and change the IP number, which is71.103.105.212 , and stick it in the apache file, but I don'tknow what else I can do - it's always worked before. )-;FWIW, I've just restarted apache, 6 PM PST, Thur, 12/14/06.Thanks,Rich

Why are transparent trimpots so rare?

Dec 10, 2006 61 Replies

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Rich Grise 19 years ago

This is frustrating. I'm on a dynamic IP, so every time I reboot I have to log onto

formatting link

and change the IP number, which is

71.103.105.212 , and stick it in the apache httpd.conf file, but I don't know what else I can do - it's always worked before. )-;

FWIW, I've just restarted apache, 6 PM PST, Thur, 12/14/06.

Thanks, Rich

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Chris Jones 19 years ago

If you make ladder attenuators e.g. R-2R ladder for ~6dB steps, there is another pair of integers which gives nice attenuation steps: R-75R. (you could use e.g. 15R and R/5 since that can be more convenient, or 5R and R/15 if that suits you better.) The steps you get are even closer to 1dB than the R-2R steps are to 6dB. You need a funny value on the last stage to terminate it, but at least there is only one of those (or two if you need to terminate both ends for some reason).

Chris

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