TSE breadboarded, making music, LED question

Alan Hope · 21st January 2012, 08:59 PM

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?

Alan Hope · 22nd January 2012, 03:48 PM

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.

21st January 2012, 08:59 PM	#1
Alan Hope diyAudio Member Join Date: Nov 2004 Location: Glasgow	TSE breadboarded, making music, LED question 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? __________________ FLAC, Ethernet over Mains, SB3, GD Audio DAC 19, Tubelab SE 45, FE206eN in Scotmoose Sachikos with Fostex FT17h supertweeters 0.68uF cap.

22nd January 2012, 03:48 PM	#2
Alan Hope diyAudio Member Join Date: Nov 2004 Location: Glasgow	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. __________________ FLAC, Ethernet over Mains, SB3, GD Audio DAC 19, Tubelab SE 45, FE206eN in Scotmoose Sachikos with Fostex FT17h supertweeters 0.68uF cap.

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