TC1044 TO LT1044 SWAP

djmiyta

djmiyta

Well-known member
Is it possible to swap out a tc for an lt 1044? whats the difference between the two?
I built a caline englishman and the squeel is really bad
I took a stripboard layout and got rid of the jumpers and moved a component
This pedal sounds great from what I hear between the squeals.
I've read a bad layout , bad wiring and charge pumps can cause the squealing. and an option is to put a buffer before the pedal to eliminate the squeal .
Any ,I mean ANY ideas that I could look at would be a great help.
Thank you in advance
 
LT1044 = yes, compatible, but probably won't solve the whistling. For a real solution, try a TC1044SCPA / MAX1044 (high frequency) instead and check the wiring and decoupling capacitors.
 
Excellent thank you

edit : wanted to come back and say i had a couple of tc1044scpa the one I had in the socket was a 1044cpaz. Swapping the cpaz for scpa definitely helped (quite a bit) but didn't eliminate the squeal 100% maybe reduced it by 50 %. Maybe I gotta try several different ones kinda like sorting through pt2399 to find the right one for that circuit? just spitballin'. Is it possible the pots are quirky, out of range, or just bad and possibly the problem? So far I haven't found anyone else who've built it complain about squealing. It really is a nice sounding distortion. and cleans up really well with the guitar volume.
 
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Try moving your cable in away and in general to see if it changes intensity
Otherwise, audio probe
Being strip board.... Well. Yeah.
 
Yes twisting turning and moving the wires changed nothing except minor pitch changes in the squeal
And with the audio probe I am to probe until i come across a point where it's squealing then try to figure out what component and why? Basically how one would probe for anything else on a non working board only I'm looking for the squeal not where a signal dies am I correct?
Thanks for the help by the way
 
Does a buffer stop the squeal in your case?

What about turning your guitar volume all the way down?
 
Robert said:
Does a buffer stop the squeal in your case?

What about turning your guitar volume all the way down?
Click to expand...
i have not tried a buffer yet since I 'm using my test box to try the board out. I don't believe turning the guitar down stopped the squeal but I'll have to double check that. Does that happen to signify something in particular?
 
Robert said:
If either stop the squeal the issue most likely isn't the charge pump.
Click to expand...
Wiring would the next likely suspect I assume. All values check out. Maybe the other IC is bad? It’s a small circuit so not a whole lot to go wrong. Maybe the layout is not good I did move a couple of things around. I’d love to get this working it’s a great sounding circuit. Hint Hint Mr Pedalpcb.
 
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