almost done w/ my ge fuzzface, one more thing tho; its a +ve gnd circuit. how do i add a external power supply socket that stops the transistors from being fried if someone puts a plug in of the wrong polarity?
The Max 1044 chip will convert a positive currnet to a negative. I used this for a positive ground octave fuzz. That way I only have to use a negative ground power source for all my effects. :D
You're probably wayy better off NOT putting any kind of power supply on a Fuzz Face.
I would try it before you start installing any DC connections for a PS
Pete, why do you say that? not to use a PS on a FF.
I ask because I have a FF circuit on my bench currently and power it from a regulated 9v PS, I see/hear no negative issues with using it, but there might be something I'm missing in this topic.
(standard LM7809 circuit)
Quote from: RedHouse
I ask because I have a FF circuit on my bench currently and power it from a regulated 9v PS, I see/hear no negative issues with using it, but there might be something I'm missing in this topic.
Try it with a carbon battery into a tube amp and see if you hear a difference when A/B'd with a PS. The impedance of the battery is said to factor into the whole FF mojo, so even Alkaline vs. Carbon makes a difference. I don't have a PS jack on mine (Ge PNP/ pos. gnd) , so I've never tried it, but I'm pretty sure I can hear the Alk. vs. Carbon in my not so scientific tests. The battery life with carbon batts. in a FF is so long, I have found it's not worth hassling to try and get it to work with my power supplies.
Kerry M
I tried it with some different PS's, ...rediculous.
Maybe I am missing something, the resistance of the battery is part of the original circuit.
Maybe more Ppl should try it, and find out it isn't always critical about the battery resistance.
I still recommend trying it first though,
I am not sure how much you have to worry about frying your pos gnd ff with negative power supply. I think it just wont work. I have a '69 that I didn't know what pos gnd (before I got into this stuff) and used my neg gnd adapter. I had it plugged in for a while before I realized I was stupid. I put a battery in and nothing was wrong with it at all? Looking at the curcuit now, I don't think Fultone puts any special protective components in there.
I may just have gotten lucky though :?
I reverse polarized lotsa GE's and Si's way back when...I have some transistors that don't work and some that make noise...I don't know exactly why...lol
Ok I tried it ...in my opinion it didn't make positive (discernable) difference, slight at most, but not enough to offset the value of the PS.
(I'm using a LM7809 based PS)
I'm going with the PS on my stuff.
(I use the PNP negative ground circuit)