bscur Posted February 17, 2008 Report Share Posted February 17, 2008 I've got an old Twin Reverb and I made a basic on/off footswitch for the vibrato effect. It works fine, but I'd like to add a battery powered LED to show when it is on. How do I do that? Quote Link to comment Share on other sites More sharing options...
aidlook Posted February 17, 2008 Report Share Posted February 17, 2008 What type of switch are you using for the footswitch? Quote Link to comment Share on other sites More sharing options...
digi2t Posted March 31, 2008 Report Share Posted March 31, 2008 You need a DPDT switch. One half for the vibrato switching, the other for the LED. I don't know about Twin Reverb, but about 2 weeks ago I made a double foot switch for a clients Fender 75. The LED's in this instance are powered by the amp. In your case, if you go with a 9V battery, create a loop with the other half of the switch. One pole of the switch to + pole of the battery. The other pole to a 1.5Kohm resistor, to your LED, to the - of the battery. Don't forget, LED's have polarity. If you LED doesn't light, switch the leads around. If you you look closely at the LED, you'll notice 2 elements, one larger than the other. The larger element goes to negative or ground. In any case, you'll have to remember to turn off the LED when your done with the pedal, or you'll run down the battery. Cheers. Quote Link to comment Share on other sites More sharing options...
al heeley Posted January 20, 2009 Report Share Posted January 20, 2009 Not always correct - for most LED's the long leg is actually the + (anode) and should go to the + of the battery. Most will have a slightly flat section at their base which is the - (cathode) - this leg should go to ground. Quote Link to comment Share on other sites More sharing options...
borge Posted January 20, 2009 Report Share Posted January 20, 2009 also, different value resisters can be used to adjust the brightness, just make sure you're still within the limits of the LED. Quote Link to comment Share on other sites More sharing options...
al heeley Posted January 29, 2009 Report Share Posted January 29, 2009 ...remember to turn off the LED when your done with the pedal, or you'll run down the battery. A Stereo jack is essential with battery powered pedals, the ring normally goes to the -, then when the jack is inserted, it makes the circuit from ring (and battery) to earth. Unplugged - the battery is saved. Quote Link to comment Share on other sites More sharing options...
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