Klon Centaur issue

[frusciante89]

Hi guys, I've just finished a Klon but I have issues with the output: although all controls seem to work, the output I get is around 30% of the dry signal (that is, when the pedal is off)... I double-check all connections and wiring but couldn't find anything wrong. Hope you can help me out

The voltage readings seem to be ok:

IC1
1: 4.37
2: 4.37
3: 3.46
4: 0
5: 4.35
6: 4.37
7: 4.29
8: 8.72

IC2
1: 4.37
2: 4.37
3: 4.36
4: -8.31
5: 4.35
6: 4.35
7: 4.32
8: 15.75

IC3
1: 8.7
2: 4.35
3: 0
4: -4.14
5: -8.3
6: 4.27
7: 6.61
8: 8.69


For now I've just wired the battery clip, not the DC plug (that's why it's not wired in the pics). Also left out the LED for now.
Also, these are some pictures:

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[antonis]

Presuming IC3 is MAX1044, voltages on IC1 & IC2 look normal (although IC1 pin 3 is loaded by your multimeter..)

Perhaps, a resistor on DPDT switch is miswired..

[Boner]

(although IC1 pin 3 is loaded by your multimeter..)

Is that the noninverting input on the TL0072 in the first stage? Should that be 4.5?

[antonis]

Is that the noninverting input on the TL0072 in the first stage? Should that be 4.5?

Sure but only for sharp +9V, absolutely equal divider resistor values, absolutely zero input current and multimeter of infinite ohms impedance.. 

[vigilante397]

Maybe I'm used to my nice voltmeter with a high internal impedance, but I've never seen a whole volt lost from meter loading, especially when the other pins are reading higher, including another of the same opamp. Some of the other pins are reading 4.36, is it possible 3.46 is a typo and was also supposed to be 4.36?

Another question for OP, do you have/know how to use an audio probe? When voltages all look good but it's still not working you can get a lot of information from actually listening to what's happening in the circuit and find out where you're dropping the signal.

[Kipper4]

Klons don't get no love here.
You won't find many threads about them. Something to do with an agreement between Aron and the FSB.

Having said that. Seems weird to have a charge pump and neither op amps is using it.
Check the schematic. I think you'll find ic2 volts are all wrong.
How do you get 15v on pin8?


Google up Klon voltages.

I'm out.

[Kipper4]

Maybe something here for you.

https://www.diystompboxes.com/smfforum/index.php?topic=116779.msg1082638#msg1082638

[italianguy63]

Delete-- posted in wrong place.

[pinkjimiphoton]

 check the orientation of your diodes and electros. i had a similar problem to italian guy's years ago, some of them voltages are wack...