Quote:
Originally posted by airspirit
Okay, I'm looking at the following power plug:
http://www.allelectronics.com/cgi-bi...513&type=store
This is a regulated one, so it SHOULD be good, methinks. I'm ordering a 10K pot for the contrast and a 1K on/off pot for the brightness (it uses 4.2V IIRC, this allows me to turn it off if I don't want it on). I'm going to fuse out the PSU like you did (500 mA or so). So, this leaves me with the following parts that I'll need, right?
Momentary switch
10 Ohm/1W resistor
12K Ohm/.25W resistor
100nF capacitor (regular type, I assume)
That sound about right?
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The PSU seems OK, but it uses a not very common connector on the DC side (for PSU's I mean).
The 10K pot for the contrast is OK.
The 12K/.25W should be 10K/.25W (you probably inversed the numbers of the 2 resistors)
100nF is OK.
For the 12 Ohm/1W we don't know for sure since we don't have the specs for the current draw of the BL. The forward voltage only doesn't mean anything.
I disagree for the 1K luminosity pot. I tried a 1K and yes you can turn the luminosity down to 0%, but the practical use of the pot resides only within the first one or two tenths of a turn.
I use a 100 Ohm and I can regulate the luminosity from 100% to about 25% (or less, it's difficult to judge) over a complete turn of the pot. Maybe a 500 Ohm (or 470) value would be better for you.
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