fuzz face LED dropped collector voltage

[eddie83]

Hi guys,

This isn't much of a problem, but i wanna know whether my fuzz face's on or off when i'm not playing  :twisted:  :twisted: . Thus i wired a 2K2 resistor and a LED from the batt -ve (i've PNP/+ve gnd fuzz face) and to gnd. Everything works perfectly, but the only thing i realised was that after the LED was included with the circuit, the fuzz was a little bit lesser. I measured the collector voltage, it dropped a bit...

Should i re-bias the collector voltage with the LED in the circuit? I've heard that wiring a LED into a fuzz face will reduce some quality in it or something like tat, but i i wire it in, and re-bias the collector voltage, wun i get back the original sound, and all else is back to normal? juz some sharing, thanks in adv!

Ed

[petemoore]

With the Battery running the LED, the supply voltage should drop a bit, measure with/without, with a small subtraction equation you can figure the amout it dropped.
 Every other point where you read voltage should change, with some kind of ratio to the PS Voltage difference.
 Put the effect on, with the LED, measure supply voltage at circuit, then set the Q2 collector resistor to get around 1/2 supply voltage.
 If this is no good IYO, pull the LED, or get a battery that's putting out more voltage so the drop is compensated for.
 Sufficient supply voltage should be obtainable when running the LED i think, whatever the difference between supply voltage when LED is on and off, you're batteries will drop too low for 'proper' FF operation 'that much sooner.