Messages

There is and I have some boards if you're interested.

I've built the dirt baby and it sounds great!  I've noticed that, like the classic DMM, the higher the Level control is set, the more the distortion.  So, would it be possible to add an output volume?  I'm thinking of replacing R5 with a 100K pot.  Would this give me better control over the output volume after the effect?

Ok, got it sorted out.  Basically my led for the optocoupler was for whatever reason way to bright.  I added a trim pot instead of the minimal resistance value in series with the depth pot and dialed the Led more dim.  This brought the thumping way down into the acceptable range.  I guess that's the risk you take when you make your own optocoupler! 

Yes, everything else works as normal.  It does get louder as you turn the depth up.  Overall its a very loud thumping, you can't use the pedal until I get this fixed.

I just completed a double flush build and everything is working fine, except for a loud low end thumping that matches the pulse.  Any idea what this is and how I can eliminate it?  It's not a ticking per se, but rather a low end thumping.

Yes, mine is boxed up.  I got the problem fixed though by replacing out one of the 10uf caps in the 18v side of the charge pump with a much larger cap 500 uf.  Chirp is completely gone.  I'm not sure if this was overkill but it fixed it using parts I had on hand.  Thanks!

Texas Instruments LT1054CP

The quadrovibe I just build sounds great except for the high pitch chirping that matches the effect speed.  I suspect it has something to do with the DC power filtering; I'm using the charge pump board that was included in the quadrovibe document.  It also goes away when I switch to battery operation.  Any ideas how to ditch the annoying chirp?

I went back and touched up all the solder joints and changed out the IC chip.  I think I might have used a bad one.  Thanks for the tips!!!

I'm having trouble with my T-bagger build.  The pedal makes no sound when hooked straight up bypassing any kind of switching.  Voltages are as follows:  Pin 1 - 8.98 volts, Pin 2 - 8.97v. 3 - 8.59. 4 - 0, 5 - 8.47, pin6 - 8.79v, 7 - 8.83 and pin 8 - 9.58.  This is all powered from a 9 volt. 

In another post, the expected voltages were as follows: "You should also take some voltage readings on your IC after doing all that. You should get about 4.5v on pins 1, 2, 5, 6 and 7, 0v on pin 4, 9v on pin8, and something around 3v on pin3. Any one of these that is significantly off is an indicator of an additional problem."

Anybody know why my voltages would be so high and if that would kill the output?

Does anybody know if a mod can be done to the loophole to have it play back in reverse?

Any idea if the Sabertooth can be run at 18volts, using 24 volt or greater electro caps?