dead llama

[guitarzan25]

I have a circuit that just needs the ancillary parts and I wired them up today with no results. Here's the description of what I've done:



SWITCH:
looking at the 3pdt switch with the pins horizontally flat- and numbered like

1 2 3
4 5 6
7 8 9

I have:

1 and 2 jumpered
3 and 8 jumpered
4 goes to ground
5 goes to "input" on pcb
6 goes to tip of output jack
7 goes to short side of LED (which the long side connects to a 47k resistor and goes to the top hot pin on the dc jack/ the middle pin of that jack is unused since I have no battery clip)
8 goes to tip of input jack
9 goes to "output" on the pcb

DC JACK
ground goes to "ground" on pcb
top hot pin connects to 47k res. and long/hot side of LED and also goes to "+" on pcb
middle pin is unused since there's no battery clip being used.

INPUT JACK (mono, since I'm not worried about conserving battery power while it's unplugged.)
mono jack, tip to pin 8 on switch
sleeve to ground ("G") on pcb

OUTPUT JACK
mono jack, tip to pin 6 on switch
sleeve to ground on board

all ground is star grounded together and connected to pcb with a single lead.

I get a signal if the pedal is disengaged, i get nothing if the pedal is engaged (and the LED is not lighting either).

POTS
1M and 10k mounted as indicated, both linear taper.


I know for a fact that the circuit itself works. I just need to wire it into an enclosure with the extra stuff here.
Thanks for any help, fellas.

-corey

[Processaurus]

The LED not lighting up is your tip that somethings up with the power situation.  Either its not hooked up right to the DC jack, the adaptor is busted, or somethings shorting the power out so bad that theres not enough voltage to run the LED.  Check for shorts against the enclosure, and double check the DC jack pinout, one of the lugs goes (usually where the battery + lead is attached) to the other lug that is connected to the ring (+9v for pedals generally) and is disconnected when an adaptor gets plugged in.  I can never remember which is which and always have to beep it out.  Also check where you've star grounded everything, and check if thats a cold solder joint.  Seems like your switch wiring is layed out right.

Be happy, its actually a good sign that nothing works, instead of half working.

[MartyB]

Just a thought, but is it possible that you have the 3PDT turned 90 degrees?  The orientation of each individual switch 'throw' would be with the lugs parallel to one another, rather than in line with each other:

       _ _ _
       _ _ _
       _ _ _    throw is top-to-bottom


       l  l  l
       l  l  l
       l  l  l     throw is left-to-right

[Paul Marossy]

I accidentally installed a 3PDT switch rotated 90 degrees on my last build. It took me a few minutes to figure out why it wasn't working when everything was soldered to the switch, whereas before, it was! First time I've done that one... 

[MartyB]

Here's a wiring link that might be helpful:

http://www.generalguitargadgets.com/diagrams/switch_lo_3pdt_tb_dcjack.gif