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Old 21st January 2012, 08:59 PM   #1
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Default TSE breadboarded, making music, LED question

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The 100mA meters have blue LED backlights, and I believe (no documentation) they need 6-12v AC or DC (DC preferred to avoid flicker). Quick question, what is the best way to achieve this?

1) Simply wire a cheap transformer in parallel with the main transformer?
2) I have a spare 50V tap on the transformer - any way to reduce this to 12V and use that?
3) The green output wires on the transformer are the 6.3v / 6A input used to drive the regulator which generates the F+. Can I tap this for the blue LEDs?
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Old 22nd January 2012, 03:48 PM   #2
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From Bottlehead forums ...

An LED plus 1000ohm resistor in series from 6.3v tube heaters will draw about 20mA, and should cause no problem.

Will try this.
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