I found a few errors. The jumper at I2 should go up to H1 to connect to Gnd, The 470K at Z9 should connect to everything to its right as is but it should also connect to the 470k/470pf just below it. I lmoved the top of that 470pf over and then put a cut there and then made a jumper down, and the last mistake Ive see so far is the 680 ohm and 47 uF at the bottom should switch spots. I think there are more mistakes as it sounds right but is very attenuated. I will look some more.
I built this as to the new posted layout, as well as swapping the 680R and 47uF at the bottom, like markie said. I'm barely getting any signal through, although all the controls seem to work. When I touch the back of the TL072, I get volume. I don't seem to have missed any links or anything. I'm not really well versed in translating schematics to stripboard layouts, but the 10k and 1nf go between pins 6 and 7 on the layout, while on the schematic it shows them going between pins 1 and 2. Is it possible there's something going on there, or am I just reading it wrong?
I was checking the signal path and things definitely get funky at the 072. I'm a little rusty, haven't built anything in a long while, but it looks like pins 4 and 8 are correct but the others are off. Fuzzhead will get it sorted. Forgive if I'm mistaken, again... it's been a while.
Pins 4 and 8 are not shown at all in the schematic (unless I missed something?) or are they generally accepted to be ground and power, respectively?
And looking at it, it seems to me that pin 3 on the layout is what pin 5 is doing on the schem. Pins 1 and 2 are on the schem as 7 and 6 respectively... Again, unless I'm reading it wrong. I'm new at this. It doesn't seem like flipping the TL072 will fix it either...
Whew... Welp, I think I'm giving up on this one. I went so far as to isolate pins 1, 2, 3, 5, 6, and 7 on the TL072, then jump them around so they matched the schematic (I think). Pin 1 jumped to the jumper at pin 7, Pin 2 jumped to in front of pin 6 (had to move the 10k and 1n), pin 3 jumped to in front of pin 5, pin 5 jumped back to in front of pin 3 (had to move the 100k), pin 6 jumped to in front of pin 1, and pin 7 jumped to in front of pin 2.
Still didn't work until I tied pins 3 and 5 together... And it "works", i.e. the controls all function as they say, and the volume and gain is all there, but now there's a high pitched whistle. Dunno if it's because of all the jumping I did, or if it has something to do with the 1044...
Hello everyone, Has anyone had success with this schematic from PedalPCB?(https://www.pedalpcb.com/docs/Mofeta-PedalPCB.pdf)
I have a question: the bottom left corner has two points: a circled minus which is conneted to GND and a circled plus which is connected to pin 1 of D100.
The layout looks good to me other than the known 47 uF and 680 R flip from Q3's source. The IC arrangement is all connected as it should be per the schematic. I will definitely be breadboarding this before building.
Make sure to check your jfets and swap them out with others to gauge sensitivity. As always mind the pinouts.
Finally got around to breadboarding this one. Sounds really really good. I re-reviewed the layout and everything still looks good other than the Q3 source 680r/47uf flip in order. I'll give the layout a go as otherwise it is a work of art
Verified! No volume issue for me. I did a decently thorough job during construction given the size of the board and I still found some errors such as a small solder bridge and even one end of a link unsoldered(!). All good. Again, to be a broken record, make sure you swap the order of the 680r/47u network at the bottom of the board coming from Q3's source. Signal path should be -> Q3 source -> 47u -> 680r -> ground
I’ve been waiting to see what’s under the hood of this one for a while.
ReplyDeleteFuzzhead, I have a layout request. How can I contact you?
ReplyDeleteI found a few errors. The jumper at I2 should go up to H1 to connect to Gnd, The 470K at Z9 should connect to everything to its right as is but it should also connect to the 470k/470pf just below it. I lmoved the top of that 470pf over and then put a cut there and then made a jumper down, and the last mistake Ive see so far is the 680 ohm and 47 uF at the bottom should switch spots. I think there are more mistakes as it sounds right but is very attenuated. I will look some more.
ReplyDeleteThanksf or the catches.
DeleteThe layout is updated.
(Sorry for the late reply, are on vacation ATM...)
I built this as to the new posted layout, as well as swapping the 680R and 47uF at the bottom, like markie said. I'm barely getting any signal through, although all the controls seem to work. When I touch the back of the TL072, I get volume. I don't seem to have missed any links or anything. I'm not really well versed in translating schematics to stripboard layouts, but the 10k and 1nf go between pins 6 and 7 on the layout, while on the schematic it shows them going between pins 1 and 2. Is it possible there's something going on there, or am I just reading it wrong?
ReplyDeleteI was checking the signal path and things definitely get funky at the 072. I'm a little rusty, haven't built anything in a long while, but it looks like pins 4 and 8 are correct but the others are off. Fuzzhead will get it sorted. Forgive if I'm mistaken, again... it's been a while.
Deletehttps://i.imgur.com/3KoLO8h.png
Pins 4 and 8 are not shown at all in the schematic (unless I missed something?) or are they generally accepted to be ground and power, respectively?
DeleteAnd looking at it, it seems to me that pin 3 on the layout is what pin 5 is doing on the schem. Pins 1 and 2 are on the schem as 7 and 6 respectively... Again, unless I'm reading it wrong. I'm new at this. It doesn't seem like flipping the TL072 will fix it either...
4 and 8 are actually good to go. 4 is -9v and 8 is +9v. It's marked on the schematic down on the bottom left, next to the LED.
DeleteYeah, that's what I thought at first, maybe flipping it would get everything right but it's just kinda jumbled overall.
I'm just hoping I can jerry rig everything into its proper place, rather than having to cut a whole new board lol
DeleteWhew... Welp, I think I'm giving up on this one. I went so far as to isolate pins 1, 2, 3, 5, 6, and 7 on the TL072, then jump them around so they matched the schematic (I think). Pin 1 jumped to the jumper at pin 7, Pin 2 jumped to in front of pin 6 (had to move the 10k and 1n), pin 3 jumped to in front of pin 5, pin 5 jumped back to in front of pin 3 (had to move the 100k), pin 6 jumped to in front of pin 1, and pin 7 jumped to in front of pin 2.
ReplyDeleteStill didn't work until I tied pins 3 and 5 together... And it "works", i.e. the controls all function as they say, and the volume and gain is all there, but now there's a high pitched whistle. Dunno if it's because of all the jumping I did, or if it has something to do with the 1044...
tl;dr - It has issues around the TL072...
Hello everyone,
ReplyDeleteHas anyone had success with this schematic from PedalPCB?(https://www.pedalpcb.com/docs/Mofeta-PedalPCB.pdf)
I have a question: the bottom left corner has two points: a circled minus which is conneted to GND and a circled plus which is connected to pin 1 of D100.
Do they indicate the lugs of DC power jacks?
The layout looks good to me other than the known 47 uF and 680 R flip from Q3's source. The IC arrangement is all connected as it should be per the schematic. I will definitely be breadboarding this before building.
ReplyDeleteMake sure to check your jfets and swap them out with others to gauge sensitivity. As always mind the pinouts.
Finally got around to breadboarding this one. Sounds really really good. I re-reviewed the layout and everything still looks good other than the Q3 source 680r/47uf flip in order. I'll give the layout a go as otherwise it is a work of art
ReplyDeleteVerified! No volume issue for me. I did a decently thorough job during construction given the size of the board and I still found some errors such as a small solder bridge and even one end of a link unsoldered(!). All good. Again, to be a broken record, make sure you swap the order of the 680r/47u network at the bottom of the board coming from Q3's source. Signal path should be -> Q3 source -> 47u -> 680r -> ground
ReplyDelete