Simply not taking the MAX1044. Takes the LTC1044 or LTC1054 or TCA962 for this. This chips have not Problems.
WormBoy wrote:At the risk of hitting that nerve again .... I build a FSH for a friend of mine, with a MAX1044 in there (TonePad PCB). It worked fine at my place, fine at his place until he took it to a rehearsal, where it died last week. My autopsy confirmed that MAX has passed away. Rounding up the usual suspects ... the FSH was powered by a 1Spot at the time of death. I know this does not prove anything beyond reasonable doubt (might still have been a flaky MAX, an error in the layout, or my soldering), but it does not make me feel entirely confident about the safety of the 1Spot, at least in combination with the MAX ...
jakehop wrote:... Good job R.G.!
R.G. wrote:We each have to go with the numbers we see.
soulsonic wrote:I'm convinced that these MAX1044s used in DIY projects are getting killed by static damage. I think static protection on the power input should be mandatory with a 1044 or any other CMOS-based voltage converter. I see that the Tonepad FSH layout does not include this protection.
Deric wrote:I've since changed to a 7660S and so far, so good.
Deric wrote:I haven't noticed any difference in tone but since I have a few 1044's left I'll swap it out and listen when I get a chance.
eggstein wrote:TC7662BCPA is a good alternative.
Deric wrote:I've wondered about static with the Max1044. I use a 1 Spot to power around 10 pedals including a PT-80 with a charge pump. I've measure the output of the 1 Spot with a supply voltage of 115VAC - 120VAC and between zero and 10 pedals and always get 9.4VDC. I have also measured the output while connecting and disconnecting other pedals from the chain to see if the voltage spiked. It never does.
Deric wrote:I have somehow fried 3 Max1044 chips in my PT-80. The last one popped when I added another pedal to the chain with everything powered up. I've since changed to a 7660S and so far, so good. I haven't noticed any difference in tone but since I have a few 1044's left I'll swap it out and listen when I get a chance.
Deric wrote:Does the VV 10th Anniversary pedal have any other "protection" for the Max1044?
Deric wrote:FWIW, I have sold the 1 Sopt at retail for several years and have never heard of one frying a pedal. We did see a very high failure rate with the 1 Spot itself when we first started selling them but they have been extremely reliable for the last few years.
WormBoy wrote:But if its static that's killing the chip, than the 15V or so that the 7660 can stand is still not very much.
WormBoy wrote:I would suspect that the 1Spot is sometimes producing a little over 9.5V temporarily, and since that voltage is already close to the max of the MAX ... Has anyone fried a MAX with another power supply than the 1Spot?
WormBoy wrote:So far, my Boss PSA has not given me problems, but I have only played my MAX-pedals at home, and not under more "extreme" conditions.
and one subtle layout trick that I came up with that I think protects it in some very esoteric cases
Deric wrote:It's important to note that I have no idea what has caused 3 Max1044's to go bad in my PT-80. It just so happens that I use a 1 Spot - I do not know if that has anything to do with it. This also happened over a long period of time - about 2 years. Although it's been a while, I MAY have been using a PSA-120 when the first one went bad.
I stumbled across the 7660S at DIYStomps and figured it was worth a try. I made no changes to the circuit - simply un-plugged the 1044 and plugged in the 7660S. It's only been a couple of weeks so..........
Tonight I swapped the 7660S and 1044 back and forth and listened for noise issues. I could hear no difference in noise or tone/performance with either one. Out of curiosity, I also measured the output of a PSA-120 and it was higher than the 1 Spot ( 9.56vdc vs. 9.4vdc ).
Deric wrote:Care to elaborate?
is no wider than 1.44 gigahertz
jakehop wrote:Change your MAX1044's to LT1054's - they can put out 10 times the current, and have a max of 15V supply!
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