Positive ground input jack problem

[Atodovax]

hello everyone so i just realized that using a positive ground circuit will put 9 volts between The Ring and the Sleeve of the stereo input jack and when you plug the guitar, before completely inserting the cable , the tip will touch the ring tab puting 9volts between tip and ring into the guitar mics.. Is that normal?

[R.G.]

Normal? Don't know, but it's sure unpleasant if you happen to have an amplifier hooked to it when you do the plugging.

There are technical issues with the scheme of switching power with a mono plug in a stereo jack. This is one, there are others. I prefer to use the ground-a-contact scheme to turn on a transistor on the circuit board. The transistor then switches on the power to the circuit.

[Atodovax]

Normal? Don't know, but it's sure unpleasant if you happen to have an amplifier hooked to it when you do the plugging.

There are technical issues with the scheme of switching power with a mono plug in a stereo jack. This is one, there are others. I prefer to use the ground-a-contact scheme to turn on a transistor on the circuit board. The transistor then switches on the power to the circuit.

Thanks R.G i meassured this 9v floating voltage between the ring and the sleeve on all of my pedals that use batteries and i am wondering if taht could damage my guitar pickups or other pedals while im plugging in the 1/4 mono jack

[antonis]

Unless you use battery for power, there isn't any reason for stereo IN jack..

[Atodovax]

Unless you use battery for power, there isn't any reason for stereo IN jack..

Thats the reason.. Im only powering the pedal with a battery and positive ground conection. When there is no plug inserted i have 9volts between sleeve and ring and when i start pushing the mono jack in, i could have 9 volts between tip and Sleeve of the guitar jack

[willienillie]

If that was true, you would be shorting your battery out when the plug was all the way in.

Positive ground is no different than negative ground, other than polarity.  And don't daisy chain an external power supply between both types, or you actually will short it out.

[Atodovax]

If that was true, you would be shorting your battery out when the plug was all the way in.

Positive ground is no different than negative ground, other than polarity.  And don't daisy chain an external power supply between both types, or you actually will short it out.

Im just reading 9volts between RING and SLEEVE in any pedal when nothing is conected with the battery on.. So when i start pluging the cord, eventually i will get 9 volts between TIP and SLEEVE of the guitar cord ( Just when the tip of the guitar cable touches the RING of the TRS jack while the SLEEVE is touching the other SLEEVE. I hope you understand. Is my Multimeter crazy or am i being recieving this voltages for 20 years now without noticing it

[Atodovax]

It happens on both Negative or Positive ground pedals. not only mines, All of the commercial pedals i have tried are doing this...

[willienillie]

Yes you're right, I misunderstood somewhat earlier.  And yes, it has nothing to do with pos ground vs. neg ground.  So we've all been briefly putting 9 volts into our guitars for as long as we've been using battery powered pedals.  The guitars don't seem to mind, but I guess we should make sure we use appropriately rated tone caps.

[vigilante397]

Unless you use battery for power, there isn't any reason for stereo IN jack..

I for one like the satisfying *cl-click* the plug makes when plugging into a stereo jack, that's why I use them.

[antonis]

Is "cl-click" for your ear pleasure only or, maybe, for more stiff plugging, too.. 

[vigilante397]

Is "cl-click" for your ear pleasure only or, maybe, for more stiff plugging, too.. 

Little bit of both, of course Seriously though, I like stereo jacks because it's an extra contact holding the plug in, I've never had a plug fall out of a stereo jack.