ggg two effects in one box wiring problem

[ulysses]

i have not actually built the ggg wiring guide for 2 effects in one box

http://www.generalguitargadgets.com/pdf/two_in_one_wiring.pdf

but looking at it - am i correct in thinking that if you plug in a wall wart then the leds will light up and the boards will get power without the input jack being plugged in?

cheers
ulysses

[Meanderthal]

 Yes. If that bugs ya you can connect the ground on the dc jack to the ring(where the battery ground goes) on the input jack.

[MikeH]

That's actually the way almost all pedals work.  I had to think about it the first time too; but take any boss, Ibanez, or whatever pedal, and if you plug in a wall wart it will turn on even if there is no plug in the input jack.

[ulysses]

That's actually the way almost all pedals work.  I had to think about it the first time too; but take any boss, Ibanez, or whatever pedal, and if you plug in a wall wart it will turn on even if there is no plug in the input jack.

thats why i love diy - i can make it do what i want

Yes. If that bugs ya you can connect the ground on the dc jack to the ring(where the battery ground goes) on the input jack.

i didnt like the diagram much so i redrew it - modded it slightly - and built it - it works perfectly..

here it is - if anyone cares 



cheers
ulysses

[ulysses]

and here it is built



cheers
ulysses

[Meanderthal]

 If you start going thru batteries like potato chips you might want to consider swapping the ground connections between the sleeve and ring... but I see you've used insulated jacks, so maybe it'll be ok as is. With metal jacks and enclosure, the bat. would still be always connected as drawn...

[ulysses]

hey Meanderthal

i am not using insulated jacks - the batt neg. does go to the case permanantly - this wont drain the battery unless there is a complete circuit to the positive terminal.

i dont see one - could you tell me where it is.

thanks mate
ulysses

edit: i dont understand how swapping the sleeve and ring connections around would make any difference - could you please explain it to me

[petemoore]

  Say you have a neg gnd effect, and want to take the battery supply circuit out when input plug is removed.
  If you connect the battery Neg. to the ring, and nothing else, the battery will be disconnected.
  Connect the rest of the circuit ground to the Sleeve [using metal box and jacks only one wire need go to one jacksleeve].
  When a MONO phono 1/4'' plug is inserted into the STEREO jack wired this way, now the battery circuit is connected from the battery to ring, Through the mono plug [the 'longsleeve' of a mono plug length makes the sleeve/ring lugs connect] to the sleeve...rest of circuit Gnd.s.
  Pull the mono plug out and the sleeve is again floating with the battery '-'.

[Meanderthal]

 Yep, what pete said.

The sleeve is in contact with the enclosure. the battery is connected to the sleeve. Your pcbs will be disconnected when the plug is pulled from the input jack, but your led will still work. If you connect the bat to the ring, and the pcb ground to sleeve that won't happen. It's no big deal, but a way to drain a battery. Murphy's law and all.

[ulysses]

hey pete,

thanks for the reply. i agree with your logic, but in my diagram i have connected the (- neg) batt terminal to the sleeve (and case). i have connected the boards ground contacts all together connected to the ring.

so i have used you logic, but i put the ring / sleeve around the other way. this should not make any diffence i believe. (see above hand drawn diagram)

meaderthal,
if there is not a complete circuit from negative to the positive batt terminals then i dont see how the battery would drain..? the (- neg) battery is only connected to the sleeve of the input jack and the case. nothing else connects to the input sleeve or the aluminium case unless the input jack is plugged in. are you able to explain why i would get a flat battery please? where would the battery drain to?

cheers
ulysses

[slacker]

You're right the battery won't drain if you unplug the input, you've just done it exactly the opposite way to normal.
The only thing I would suggest is to connect the sleeves together with a wire. Grounding them together with the case can be a bad idea. For example if the output socket comes loose then it won't be grounded or might be grounded intermitantly, not something you want mid gig.