footswitch led question for peavvey

[frobro808]

I have a delta blues115 and I intend to build my own fs. I found a few schematics and whatnot but since it's me and I wanna be difficult, I decided to:

- build it in a standard 'B' sized box from small bear (not too bad)
- use spst switches (standard right?) for both channel and tremolo switching
- here's the kicker (?) I wanna use a white led and an aqua/teal led with the light plate cuz it looks kinda cool and I don't wanna drill more holes than I need to

Do I need to worry about voltage issues? And if so what resistor values do I need to get?

Forward voltage for the white led is 3.4v and 3.6 for aqua if that helps

Thank you!

[newey]

- use spst switches (standard right?) for both channel and tremolo switching

The standard footswitch doesn't have an LED, you'll need a pole to switch the LED on/off. Most stompboxes use a 3PDT footswitch (of the latching type); these are readily available, you may find these easier to obtain than a DPDT one.

And, the LEDs need a power source, which will presumably be a 9V battery.

Now, your choice is to trot out your knowledge of Ohm's Law and reach back into the dim recesses of your memory for some of the High School algebra you've probably forgotten . . .

. . .or, you can calculate the necessary resistor values using this handy calculator application, but you also need to know the forward current (in mA) of your LEDs, not just the voltage.

LED resistor calculator (for multi-LED arrays)

[frobro808]

hahahaha....hah oh yea?? think i forgot my alge.....
yeah you're right. i did forget

but the current for the white led is (according to the site ima purchase these from)
30mA
the aqua
20mA

i have read that the DB115 has power running out of the footswitch jack but i think i'll stick with what i know you know and use a 9v power supply.

in that case, how would you wire that up? i have never wired a dc jack to anything. this'll be my first pedal build of sorts.

..also thank you for your reply!

[flateric]

see here on beavis audio site: adding an LED to a switch
www.beavisaudio.com/techpages/Switches/
resistor: i normally go for 1 - 2 k for red, green, yellow, up to 3.3k for a blue one which seem to be a lot brighter (maybe I bought a 'superbright' blue) but as beavis says, anything fro 1 - 5k will be fine.
So there may be a slightly discernable difference in the relative brightness of the white one vs the aqua one. But does it matter?
Have a look at Beavis site section on powering pedals too, its a great little site I've used dozens of time for help on schematics.
www.beavisaudio.com/techpages/PedalPower/

[flateric]

more here.......
acapella.harmony-central.com/showthread.php?1717180-Footswitch-wiring-diagram.&p=23753924&viewfull=1#post23753924

[reTrEaD]

Apr 15, 2012 7:11:04 GMT -5 newey said:

The standard footswitch doesn't have an LED, you'll need a pole to switch the LED on/off. Most stompboxes use a 3PDT footswitch (of the latching type); these are readily available, you may find these easier to obtain than a DPDT one.

And, the LEDs need a power source, which will presumably be a 9V battery.

Sometimes this is the easiest way, but not always. In some cases, a footswitch activates relays. Often, an LED can be placed in series with the footswitch controlling the relay. The same current that energizes the relay, also illuminates the LED.

I haven't looked at the schematic for the Delta Blues, so I can't say if it can be done in this particular case.