Tone Vendor - completely silent

[skrattadu]

Hey guys, I just wired up a the Tone Vendor MKI and it's not working. I've built many pedals before so I know the basic checklist to go through... check for shorts, re-flow solder joints, check the switch, etc. This one just isn't working. I'm thinking maybe it's the transistors?
Also, I subbed a 22uf electrolytic for the 25uf since I don't have any 25s laying around, could that be it?
Bypass works, when I hit the switch, it's dead silent.
Any help would be appreciated!!

 

[Betty Wont]

Are you sure of your transistor pinout. Some of the russian transistors are different.

 

[skrattadu]

I just put them in there so they matched the holes... how can I tell which is which?

 

[Betty Wont]

Datasheets and multimeter/transistor tester. Look up the models of transistors you have.

 

[skrattadu]

Found the diagram for it.
Base
Collector
Emitter
now... how do I know which leg goes where on the PCB? I tried following the schematic and I still got nothin'.

 

[skrattadu]

Nevermind, I figured it out! Pinout was wrong. Thanks!

 

[music6000]

This is Pinout for PCB

 

[skrattadu]

Thanks, got it! One more question: I had to change an electrolytic and now there's a high pitched squeal... did I fry that capacitor? What else could cause that noise?

 

[Coda]

Thanks, got it! One more question: I had to change an electrolytic and now there's a high pitched squeal... did I fry that capacitor? What else could cause that noise?

Is it constant? Or just with the gain control up?...

 

[skrattadu]

Update: I figured out it's only when I have the power connected to the daisy chain with the rest of my pedals. It's fine when I connect the 1-Spot directly into it. It goes away if I turn the gain all the way down but right as soon as a nudge it up to about 8:00 it starts again and doesn't get any louder as I turn it up. I know that tone benders usually have problems when connected in a daisy chain, but PedalPCB says this has an onboard voltage inverter so it shouldn't be a problem...
edit: when using an isolated power source, it gives off a really high pitched dog whistle type sound... it's so high it's almost above the range of my hearing.

 

[music6000]

Update: I figured out it's only when I have the power connected to the daisy chain with the rest of my pedals. It's fine when I connect the 1-Spot directly into it. It goes away if I turn the gain all the way down but right as soon as a nudge it up to about 8:00 it starts again and doesn't get any louder as I turn it up. I know that tone benders usually have problems when connected in a daisy chain, but PedalPCB says this has an onboard voltage inverter so it shouldn't be a problem...
edit: when using an isolated power source, it gives off a really high pitched dog whistle type sound... it's so high it's almost above the range of my hearing.

Did you have to twist C & B Legs on your transistors, make sure they are not touching!

 

[giovanni]

Did you try with a battery?

 

[skrattadu]

So I went through and took the transistors off and re-soldered them and added a low pass filter to the output jack and that fixed the super high frequency ring. Still getting that squeal when hooked up to the daisy chain, and I figured out that it only happens when hooked up to other pedals. I hooked it up to the daisy chain for power and went guitar--->bender--->amp and it worked fine, but when I put it on my board with all my other pedals, it squeals.

 

[music6000]

So I went through and took the transistors off and re-soldered them and added a low pass filter to the output jack and that fixed the super high frequency ring. Still getting that squeal when hooked up to the daisy chain, and I figured out that it only happens when hooked up to other pedals. I hooked it up to the daisy chain for power and went guitar--->bender--->amp and it worked fine, but when I put it on my board with all my other pedals, it squeals.

See if you can get a 7660SCPAZ & swap out the TC1044SCPA, it's the only one I use & never had an issue!
I should ask where you got your TC1044SCPA, alot of members have had trouble with them from different vendors squealing.

 

[skrattadu]

Update: Hooked it up to a battery and put it on my board and the same thing happened.

 

[music6000]

Update: Hooked it up to a battery and put it on my board and the same thing happened.

See if you can get a 7660SCPAZ & swap out the TC1044SCPA!
Mr PedalPCB has never had an Issue with TC1044SCPA .
I should ask where you got your TC1044SCPA, alot of members have had trouble with them from different vendors squealing.
7660SCPAZ, it's the only one I use & never had an issue!

 

[music6000]

Can you show a Picture of your Soldered side.
If your Board is not clean, it may be causing your issue!

 

[skrattadu]

I got it from Tayda. I will clean off the solder side and see what happens.

 

[skrattadu]

Cleaned the board, still squealing. I'll try one of those new chips!
What is it about the chip that might cause squealing when hooked up to other pedals?

 

[skrattadu]

Swapped out the chip and it works perfectly! Thanks!!