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Ampotor, need help

PostPosted: 16 Apr 2011, 12:34
by 7dust
Hi folks,

I just finish Ampotor from TONEPAD, i'm testing it sound's great very good clean sound, and when i connect to the DC jack it works fine, true-bypass works fine also, the problem when i use 9v batery it doesn´t work.. I also use tonepad offboard wiring nº 5..

Any help would be great, thanks

Re: Ampotor, need help

PostPosted: 16 Apr 2011, 12:53
by mysticwhiskey
Got a photo of your DC jack / battery wiring? Check that the correct pins have been wired to the battery. Also, make sure you're using a known good 9V battery - that's caught me out before :slap:

Re: Ampotor, need help

PostPosted: 16 Apr 2011, 13:00
by mysticwhiskey
Also, what DC jack are you using? Got a multimeter? Check the continuity between the battery snap terminals and the end of the wires to see if there's a break there.

Re: Ampotor, need help

PostPosted: 16 Apr 2011, 13:21
by 7dust
Hi thanks

I check continuity between bat and terminal, i also use the multimeter, i notice that i have on DC JAck, 9,50 volts i saw connection betwen jack ( red bat) to tip of Stereo Jack.

Re: Ampotor, need help

PostPosted: 16 Apr 2011, 13:37
by 7dust
But the red of DC jack ( 9 Bat ) and the sleeve of jack stereo is 0 volts.. with 3 pdt on and off

i just ceck that the DC jack (9 bat ) and the tip stereo as 9,5 volts.. with 3PDT on and OFF

Re: Ampotor, need help

PostPosted: 16 Apr 2011, 13:42
by 7dust

Re: Ampotor, need help

PostPosted: 16 Apr 2011, 13:50
by 7dust
Hummm, when i plug power on jack dc i get 9,05 on circuit and 9,05 on ground of circuit,

when i use bat i get 9,50 on circuit i have 0 volts on circuit, i think the problem is the DC JACK... that works with power and not work with battery 9v

Re: Ampotor, need help

PostPosted: 16 Apr 2011, 14:14
by mysticwhiskey
Are you using a metal enclosure? If so, those DC jacks will ground the power connector's barrel to the chassis. If you're using a negative-center power supply then that will cause problems. If you're using a center-positive supply then that will work, but you need to make sure you're wiring up the terminals correctly.

Edit: Just noticed you said you've got +ve voltage on the ground. You're better off buying a different type of DC jack. Get one that's isolated from the chassis (get a plastic one). Then you can wire it up like this:

StompboxBatteryDCJackWiring.png


This wiring diagram applies to negative-center power supplies, and with these types of DC jacks:

http://www.pedalpartsaustralia.com/imag ... C_jack.jpg

Re: Ampotor, need help

PostPosted: 16 Apr 2011, 15:00
by 7dust
Grateful Thanks,

Yes, my enclosure is metal, and the problem is the metal dc jack is not isolated... :)

I'll try difent dc jack...

Re: Ampotor, need help

PostPosted: 22 Apr 2011, 12:25
by 7dust
Hi finally the battery problem is resolved, the problem was that i was used mono input jack, and i change it to a stereo jack and it work well.. :mrgreen:

thanks, hope