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Depends on your circuit and what you want to show as powered. If you're trying to show the AC circuit, put an AC led in series with the circuit on the powered side.
If trying to use the DC side(battery) wire in the DC circuit.
Here's an discussion on LEDs on this site http://www.cigarboxnation.com/forum/topics/led-hookup
Make sure your LED is rated for the type of voltage you are wiring into.
Hopes this helps.
Most pedals run on 9v, even when AC powered. The trick is to find a clean DC source, or one that is live when the pedal is "HOT".
LEDs can vary in their voltage requirements, but most have a voltage drop of 1.7 to 2.1v, and blues in the 3.4v range... ok.. back up...
Get some cheap red or green LEDs. do NOT get the clear ones.. those are high-brightness LEDs, and it'll be like having a flashlight...
You'll need 680 ohm resistor. That'll work with red, yellow, or green led's and be close enough... you won't be running the full output of the LED, but it will be bright enough to see..
On the LED, there are 2 leads... The longer one goes to the Positive (+) power, the other to ground. Somewhere you will need the resistor, and it really makes no difference which leg you solder it to.
Make sure you put some heat shrink over the exposed wires to avoid shorting something out.
If you post a Pic of the pedal (opened) I'm sure we can identify where to get power from. The best bet is to use a digital voltmeter.
John
No worries... been there . . . a lot... sometimes the most obvious solutions stare us in the face...
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