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Old 1st September 2008, 01:53 AM   #1
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Thumbs down Where Can I Pick Up Neutral

Hi,
I have just finished making my simple se from www.tubelab.com. This is my first foray into making anything electrical/electronics in twenty years so please be gentle with your answers.
I have kept my amp simple (because I don't know any better), there is a volume knob and a power switch on the front. I wish to add an led to show when power is on (I know the tubes/valves will be iluminated), I will be taking the +ve voltage from either the 5v or 6.3v taps to a resistor and then further on to the led.
Right now the question, can I simply use the neutral on the input side of the transformer (sorry if the terminology is wrong), I cannot see any reason why I should not do this, however I thought I would ask people in the know.
Cheers in advance

Brian
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Old 1st September 2008, 02:12 AM   #2
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First off, do NOT make any connection to the 5 volt winding. It is connected directly to B+ and caries over 400 volts. No connection to the primary side of the power transformer should be made either.

Connect your LED with a resistor in series from one of the green power transformer wires to the other green power transformer wire.
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Old 1st September 2008, 02:34 AM   #3
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George,
Thank you for your help. I would also like to thank you for the pcb, I am extremely impressed by the sound quality. I was never fully sure what everyone was raving on about, it has impressed even my wife and she is the ultimate critic.
Regards

Brian
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Old 1st September 2008, 02:42 AM   #4
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I like to use Mouser part number 103-R13-135B-02R-EV

It has a SPST switch with a built in neon lamp. You just wire the lamp in parallel with the power transformer's primary winding. When the power transformer is energized, so is the lamp. The lamp runs off 120VAC, so there's no additional circuitry required.

If you don't like them in red, they have green ones too.
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