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Hi

I've completed my Dirtbaby and it's amazing, everything works fine, but I've some questions about the final result ...

1.- When feedback is up, I can to hear the sound of the oscillator, is this normal? is there any solution in that aspect?
2.- Modulation works but I think it has little presence, it's like if that had low volume respect to delay. Is there any improvement in this aspect?
3.- What other mods recommended to achieve a better result?


I've built the 2015 v. 1, the R40 and R41 was removed and I use a jump on the pads of tails

Thank you guys

Are you sure the LED is conencting to ground? Also, the voltage on pin3 of IC3 is looking fairly low. With a measured supply of 8.4v it should be more like 4v, not 2.4v. So, have a look again at R22, 23 and make sure they are right. If so, pull IC3 from its socket an remeasure pin3 without the IC to see what you get.

I've building other pcb and now the effect doesn't tremolo effect but if the volume pot is high in my amp, I can hear the sound from the oscilator, but the tremolo effect doesn't appear, could be the vactrol ? I've reflow again and I've checked bridges and both is ok.

Are you sure the LED is conencting to ground? Also, the voltage on pin3 of IC3 is looking fairly low. With a measured supply of 8.4v it should be more like 4v, not 2.4v. So, have a look again at R22, 23 and make sure they are right. If so, pull IC3 from its socket an remeasure pin3 without the IC to see what you get.

Yes, is connected to the ground, but I've measure the voltage between R13 - Led+ and the voltage is 1,9v
I've measure pin3 in the socket of IC3 is 2,6v , the same voltage in R22 - R23 (I've measure again)

Are you sure the LED is conencting to ground? Also, the voltage on pin3 of IC3 is looking fairly low. With a measured supply of 8.4v it should be more like 4v, not 2.4v. So, have a look again at R22, 23 and make sure they are right. If so, pull IC3 from its socket an remeasure pin3 without the IC to see what you get.

Yes, is connected to the ground, but I've measure the voltage between R13 - Led+ and the voltage is 1,9v

I've measure pin3 in the socket of IC3 is 2,6v , the same voltage in R22 - R23 (I've measure again)

Which LED is not working...the one after R13? If so, the LFO seems to be the issue and your vactrols might be fine. You should take some voltage measurements on IC2 and IC3 to see if they are operating correctly.

Yeah, that led after R13 .... I've taken some ICs measurements and these are:


Supply : 9.28 V

LF351 (IC2)

Pin 1 - 3,2v
Pin 2 - 2,2v
Pin 3 - 2,38v ~ 2,47v
Pin 4 - 0v
Pin 5 - 0,05v
Pin 6 - 1,64v
Pin 7 - 8,4v
Pin 8 - 7,39v

TL062 (IC3)

Pin 1 - 2,9v ~ 3,2v
Pin 2 - 0,65v
Pin 3 - 2,4v
Pin 4 - 0v
Pin 5 - 2,4v
Pin 6 - 2,4v
Pin 7 - 2,4v
Pin 8 - 8,4v

In pin 3 of IC2 and pin 1 of IC3 the voltage varies between those two values

Hi guys,

I've build the double flush following this doc

http://www.madbeanpedals.com/projects/DoubleFlush/docs/DoubleFlush.pdf

However, pedal doesn't nothing, volume pot works, I can raise and lower the level but the other 3 seem to not work, the vactrol I've used is that of the image



They've sold as VTL5C1, but I think that it is not, could this be the problem? LED does not work, check the connections, there's no bridge or bad connections, the values are correct and already build 3 different PCBs and the same problem happen.

Any suggestions? do the same thing happened to someone?