2 effects both powered by "center negative" can cause a SHORT shutting down a daisy c

[Toner]

Re: 2 effects both powered by "center negative" can cause a SHORT shutting down a dai

Re: 2 effects both powered by "center negative" can cause a SHORT shutting down a dai

Sounds simple, sure. Put some circuits run on positive ground. Like said, you cannot just go in and switch wires and expect it to work all hunky dory. Components can get fried doing that.

Can someone explain to me how something would get screwed up, how power being on the tip instead of the sleeve matters? I'm trying to understand how this makes a difference because I've done it at least 15 times, never had a problem (I mean, I don't recommend attempting this if you don't know what you are doing. maybe if you don't know how to solder and screw things up inside, switching 2 wires is so easy of a task I DONT want to do it, hehheh, ohh great, I have to take 5-10 mins taking apart and putting back togeather a pedal for swapping 2 wires that takes 30 seconds). How can something get fried, it's power and ground, doesn't matter if it's tip or sleeve as long as you stay at voltage requirements. I can throw 2 6V batteries in my car and wire them up to run to run 12V, It will work fine if everything stays at requirements (voltage and CCAs).

v847 put one in
electro harmonix big muff
electro harmonix small stone
like 5 old DOD pedals

to name a few.

 

[devastone]

Re: 2 effects both powered by "center negative" can cause a SHORT shutting down a dai

Re: 2 effects both powered by "center negative" can cause a SHORT shutting down a dai

Those you listed are IC or NPN transistor based circuits with negative ground. If you do it to an original Fuzz Face type circuit with PNP transitors with positive ground, it won't work, and may fry some expensive transistors, or maybe pop some electrolytic caps.

It's not a conspiracy, as said, the manufacturers, like Chicago Iron apparently, have supplied a plug for a standard adapter, but you have to have a dedicated adapter for it, or it can be daisy chained with other positive ground pedals, but not with standard negative ground pedals.

Besides, the plug is apparently wired correctly on the original poster's pedal, it is just apparently a positive ground pedal (have to make this assumption since he hasn't told us what pedal it is yet).

Take a valium, it's not worth getting so worked up over, and some of us here really do know what we are talking about.

 

[GoldenVulture]

Re: 2 effects both powered by "center negative" can cause a SHORT shutting down a dai

Re: 2 effects both powered by "center negative" can cause a SHORT shutting down a dai

As referred to before;It sounds like your overdrawing the power supply;Not enough power output to feed all your pedals!If they are all centre negative and they work individually,that is most likely the cause.

 

[ErikH]

Re: 2 effects both powered by "center negative" can cause a SHORT shutting down a dai

Re: 2 effects both powered by "center negative" can cause a SHORT shutting down a dai

Those you listed are IC or NPN transistor based circuits with negative ground. If you do it to an original Fuzz Face type circuit with PNP transitors with positive ground, it won't work, and may fry some expensive transistors, or maybe pop some electrolytic caps.

You hit the nail right on the head. This is exactly what I was going to say.

The Dallas Rangemaster is another PNP transistor circuit with positive ground.

 

[Toner]

Re: 2 effects both powered by "center negative" can cause a SHORT shutting down a dai

Re: 2 effects both powered by "center negative" can cause a SHORT shutting down a dai

I guess I've either never come across a PNP positive ground pedal I wanted to switch, or according to this information, when I did it was one of the times it didn't cause any concerns. Looks like if you really wanted to switch it, you could with some extra parts (which I would totally go through, I'm ocd when it comes to a mountain of power supplies in my live rig, too many problems too many time with things going out and having to trouble shoot on the spot).



taken from http://fuzzcentral.ssguitar.com/faq.php

What about PNP Negative Ground Wiring?
I personally do not think that wiring up PNP transistors (Silicon or Germanium) as negative ground is one of the best ideas. The PNP transistors are simply not meant to function with a negative ground and osciallation and "motorboating" sounds are common results of wiring a Fuzz Face with PNP transistors as such. Here's some more information from R.G. Keen:

While in theory, the negative ground conversion for FF and other PNP circuits ought to work every time, there are a significant number of times where it causes oscillation, motorboating, etc. Sometimes you can clean this up by putting a big freaking capacitor across the power leads, sometimes you also need a low-impedance 0.1µF ceramic, too, and sometimes you need divine intervention. Try it if you want, but be aware that there are conditions and layouts that will not be trouble free if you flip power and ground.

So, in my opinion, I would always leave PNP transistor-equipped circuits as positive ground. A circuit like the Fuzz Face will use such a small amount of current that a battery will last a very long time, even with heavy use...as long as there's not an LED to increase current draw. If you're absolutely determined to use a negative ground Fuzz Face, I would suggest that you go through the extra trouble of getting some NPN Germanium transistors which will work properly with a positive power supply and negative ground. Small Bear Electronics has NPN Germanium transistors.