It is based on on this PCB layout. http://effectslayouts.blogspot.com/2021/12/devi-ever-hounds-tooth.html Are you using metal can or plastic 2N2907s? The layout is using the metal can transistor pinout since thats what Devi used.
I tried both actually! I figured they were metal can, being Devi pedal. I'm not sure if my transistors are out-of-spec (got 'em both from Tayda) or what, but I'm getting a real farty, heavily-gated fuzz sound. I've got to hit the strings pretty hard to make any sound. And I saw someone on Effects Layout had the same problem.
Do these voltages look normal? It's what I'm getting across all the transistors. E 0.0 B 0.62 C 1.11
I did notice, almost on accident, that if I remove Q2 it starts sounding a lot closer to the demo videos. When I remove Q2, the collector on Q1 jumps up to 2.6. Bias issue maybe?
Hello. I noticed that Mask Audio Electronics posted some gutshots and a trace of this one recently at FSB. https://www.freestompboxes.org/viewtopic.php?t=31796
Hi, is anyone able to confirm that this layout matches the trace from AZX309 in the above link? Sorry, I am terrible at visualizing schematics in the context of stripboard.
just peeked at AZX309's schem and compared it to the layout. looks perfect to me. assuming that schematic is correct, might just be that newer components are out of spec?
After checking out the two links listed in these comments - one from the Effects Layout post about this circuit and the other from Mask Audio posting about it on FSB - it looks like this stripboard drawing is most likely correct. But it also looks like you may have to socket and test a bunch of different transistors as opposed to just plugging in the MPSA18 + 2n2907 combo listed here in order to get this one sounding like the youtube demos. The majority of Devi's designs from the late 00's are variations on the same theme and kind of follow the same circuit design path for the most part. Good luck!
Went ahead and built it with the listed parts. I used a 4001 for D1 as I saw that on another site. I'm getting a decent likeness in tone but I have to really dig in on the strings. It's gating quite a bit. Also oscillating at full gain. I will try different transistors and report back...
Just tried all Mpsa18 and it's very close. Everything works. It's very loud! But you get a lot of control on the guitar volume and tone for more overdrive type sounds. I'll try match the hfe and see what happens...
do you have a schematic for this one? built it just now but something isn't quite right.
ReplyDeleteIt is based on on this PCB layout.
Deletehttp://effectslayouts.blogspot.com/2021/12/devi-ever-hounds-tooth.html
Are you using metal can or plastic 2N2907s?
The layout is using the metal can transistor pinout since thats what Devi used.
I tried both actually! I figured they were metal can, being Devi pedal. I'm not sure if my transistors are out-of-spec (got 'em both from Tayda) or what, but I'm getting a real farty, heavily-gated fuzz sound. I've got to hit the strings pretty hard to make any sound. And I saw someone on Effects Layout had the same problem.
DeleteDo these voltages look normal? It's what I'm getting across all the transistors.
E 0.0
B 0.62
C 1.11
I did notice, almost on accident, that if I remove Q2 it starts sounding a lot closer to the demo videos. When I remove Q2, the collector on Q1 jumps up to 2.6. Bias issue maybe?
Hello. I noticed that Mask Audio Electronics posted some gutshots and a trace of this one recently at FSB. https://www.freestompboxes.org/viewtopic.php?t=31796
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteHi, is anyone able to confirm that this layout matches the trace from AZX309 in the above link? Sorry, I am terrible at visualizing schematics in the context of stripboard.
ReplyDeletejust peeked at AZX309's schem and compared it to the layout. looks perfect to me. assuming that schematic is correct, might just be that newer components are out of spec?
DeleteAfter checking out the two links listed in these comments - one from the Effects Layout post about this circuit and the other from Mask Audio posting about it on FSB - it looks like this stripboard drawing is most likely correct. But it also looks like you may have to socket and test a bunch of different transistors as opposed to just plugging in the MPSA18 + 2n2907 combo listed here in order to get this one sounding like the youtube demos. The majority of Devi's designs from the late 00's are variations on the same theme and kind of follow the same circuit design path for the most part. Good luck!
ReplyDeleteWent ahead and built it with the listed parts. I used a 4001 for D1 as I saw that on another site. I'm getting a decent likeness in tone but I have to really dig in on the strings. It's gating quite a bit. Also oscillating at full gain.
ReplyDeleteI will try different transistors and report back...
Just tried all Mpsa18 and it's very close. Everything works. It's very loud! But you get a lot of control on the guitar volume and tone for more overdrive type sounds.
ReplyDeleteI'll try match the hfe and see what happens...