This seems cool! i built it and i can tell its trying to do things, ive messed around with mixing and matching 072,4558,and 5532's. and im stuck with 2n5457's. so who knows could be an issue there. do you have a schematic link for this?
I could be wrong, but I think the 1M on column five needs to connect to Pin 3 on IC1? I built it earlier but all I'm getting is clean signal. Haven't had a chance to troubleshoot it yet, but I'm pretty sure it's my build and not the layout.
Yes, that 1M resistor should connect to pin 3. Layout is updated. Here is the schematic: https://www.diystompboxes.com/smfforum/index.php?topic=48809.0
I checked over the layout/schematic a couple times and couldn't spot an error. So I started swapping out ICs. I had NE5532, OPA2134, TL072, JRC4558, and TL062s on hand. NE5532 in IC2 and almost any other IC in the first spot gave me the bit crushing effect but also an insanely loud whine. after a LOT of swapping, the best I could get is 2 TL062s. The whine is still there, but it's not nearly as loud. Still unusable tho :( looks like this circuit is just very particular about the specs of the IC or maybe the tolerances of each part. Not sure, but I feel pretty confident it's not an issue with the layout.
Did some reading on the op amp selection and it appears that it is quite finnicky in that regard so some testing is nessecary. However, it seems that TL072 works fine for IC1 and usually op amps with BJT inputs works better for IC2. So I guess 1458, 4558, LM358, NE5532, etc. is the ones to start with... For the bleedthrough whine from the oscillator it is just the natureof the beast and no one have come up with a solution for it. :-/ But Freppo at Parasit Studio did an improved and extended version with no oscillator bleedthrough a few years ago, called Sonic Reducer. A highly recommended build! https://dirtboxlayouts.blogspot.com/2020/12/parasit-studio-sonic-reducer-v2.html
So, I built this yesterday and at first it didn't work. No ring mod. I used (2) TL072. Looking at the above comments as a guide I used a tl072 for IC1 and NE5532 for IC 2 and it works. Musically, it's really only useable the first 25% of the turn on the Frequency pot. After that it's a bit hard to tell which note is which. Anyways, you can mark this one verified.
I've encountered similar pitfalls with this design, as I tried to build the tagboard layout and got way too much whine. I second the Parasit Sonic Reducer recommendation. It's a solid circuit. I just built one up and love it.
This seems cool! i built it and i can tell its trying to do things, ive messed around with mixing and matching 072,4558,and 5532's.
ReplyDeleteand im stuck with 2n5457's. so who knows could be an issue there. do you have a schematic link for this?
I could be wrong, but I think the 1M on column five needs to connect to Pin 3 on IC1? I built it earlier but all I'm getting is clean signal. Haven't had a chance to troubleshoot it yet, but I'm pretty sure it's my build and not the layout.
ReplyDeletehttp://experimentalistsanonymous.com/diy/Schematics/Fuzz%20and%20Fuzzy%20Noisemakers/Analog%20Bit%20Crusher.gif
Is this the schem you used?
Yes, that 1M resistor should connect to pin 3. Layout is updated.
DeleteHere is the schematic:
https://www.diystompboxes.com/smfforum/index.php?topic=48809.0
Same for me, just a clean signal.
ReplyDeleteI checked over the layout/schematic a couple times and couldn't spot an error. So I started swapping out ICs. I had NE5532, OPA2134, TL072, JRC4558, and TL062s on hand. NE5532 in IC2 and almost any other IC in the first spot gave me the bit crushing effect but also an insanely loud whine. after a LOT of swapping, the best I could get is 2 TL062s. The whine is still there, but it's not nearly as loud. Still unusable tho :( looks like this circuit is just very particular about the specs of the IC or maybe the tolerances of each part. Not sure, but I feel pretty confident it's not an issue with the layout.
DeleteDid some reading on the op amp selection and it appears that it is quite finnicky in that regard so some testing is nessecary. However, it seems that TL072 works fine for IC1 and usually op amps with BJT inputs works better for IC2. So I guess 1458, 4558, LM358, NE5532, etc. is the ones to start with...
DeleteFor the bleedthrough whine from the oscillator it is just the natureof the beast and no one have come up with a solution for it. :-/
But Freppo at Parasit Studio did an improved and extended version with no oscillator bleedthrough a few years ago, called Sonic Reducer. A highly recommended build!
https://dirtboxlayouts.blogspot.com/2020/12/parasit-studio-sonic-reducer-v2.html
that's funny-- sonic reducer is literally next on my build list.
DeleteAm I crazy or should the drain of the FET be connected to +? Should it be flipped around?
ReplyDeleteOh sorry it is connected to power. My bad my bad.
ReplyDeleteSo, I built this yesterday and at first it didn't work. No ring mod. I used (2) TL072. Looking at the above comments as a guide I used a tl072 for IC1 and NE5532 for IC 2 and it works. Musically, it's really only useable the first 25% of the turn on the Frequency pot. After that it's a bit hard to tell which note is which. Anyways, you can mark this one verified.
ReplyDeleteI've encountered similar pitfalls with this design, as I tried to build the tagboard layout and got way too much whine. I second the Parasit Sonic Reducer recommendation. It's a solid circuit. I just built one up and love it.
ReplyDelete