LEDs off heater leg of mic psu.

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TheGuitarist

TheGuitarist

Well-known member
Joined
Apr 5, 2009
Messages
495
Location
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Thought if ask before I did anything stupid, but had anyone tried this or know if it would introduce noise into the circuit?

Love to have some fun if I can make it work.
 
I powered an LED off the AC heaters in this guitar amp I built:

http://www.frontiernet.net/~jff/pipsqueak_pentode/pentode.pdf

I couldn't hear the LED
 
I would worry about noise; the impedance of the head amp is several gigaohms. Powering an LED directly with AC creates large spikes. I would recomment to rectify and filter before the LED. Even then, the diode's threshold could be a problem.
 
i'd assume the heaters are already rectified to dc if it's a microphone and (speculating) uses a single cable... can't imagine anyone wanting to run ac filament wire parallel to audio at all, much less for the length of a cable run  :eek:.

abbey road d enfer said:
Even then, the diode's threshold could be a problem.
Click to expand...
as in a noise problem, or just that the led would have to have a threshold voltage lower than the filament voltage in order to light?
 

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