Earthquaker Devices - Chrysalis Overdrive [traced]
- ieatyouforbreakfast
- Breadboard Brother
GUTS!
Capacitors from left to right:
First Row:
.1uf
.022uf
100pf
.1uf
Second row:
.001uf
100uf
4.7uf
.0047uf
.1uf
Transistors:
MPSA18
The overdrive sounds great, reasonably priced, and well built. Would love to figure out what goes on in this one!
Capacitors from left to right:
First Row:
.1uf
.022uf
100pf
.1uf
Second row:
.001uf
100uf
4.7uf
.0047uf
.1uf
Transistors:
MPSA18
The overdrive sounds great, reasonably priced, and well built. Would love to figure out what goes on in this one!
Last edited by culturejam on 05 Jul 2011, 12:58, edited 1 time in total.
- culturejam
- Old Solderhand
Information
I like that layout!
It *almost* has a Jack Deville quality to it.
It *almost* has a Jack Deville quality to it.
- ieatyouforbreakfast
- Breadboard Brother
I'll try and get some trace side pics around Wednesday. It's on my practice board right now but I should be free to take it off and open it up sometime later this week.
- JOHNO
- Cap Cooler
It's going to be difficult to see much with the pots soldered on like that, unless your prepared to remove them. You might be able to bend them slightly to expose the traces.
Thanks for the pic.
Thanks for the pic.
- ieatyouforbreakfast
- Breadboard Brother
I wouldn't say it's too far off from Martin's Folk Driver in basic design. It definitely does have that "chewy" discrete sound.Lawnchair wrote:Looks pretty straight forward. MPSA18's are a interesting choice for a overdrive.
High gain transistors in an overdrive remind me of this.
- RnFR
- Old Solderhand
Information
the fact that the folk driver uses nfb as well as pfb makes it pretty unique. I wouldn't be surprised it was more along the lines of this-
https://www.freestompboxes.org/viewtopic.php?f=7&t=12875
most likely two BJT stages and assym clipping, or possibly with the clipping in between the stages by the way it looks laid out.
https://www.freestompboxes.org/viewtopic.php?f=7&t=12875
most likely two BJT stages and assym clipping, or possibly with the clipping in between the stages by the way it looks laid out.
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic
Blog-APOCALYPSE AUDIO
Blog-APOCALYPSE AUDIO
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- Posts: 2
- Joined: 04 Oct 2010, 04:10
so this was discontinued earlier this month. Maybe now's a good time to get a hold of this schematic?
- MoonWatcher
- Diode Debunker
In absence of replies, why not at least look at what is indicated on the pcb? I don't see any resistors of value 2m2 (red/red/black/green), so it's probably not built up from either an Electra or the Folk Driver. The caps look like they'd all be similar in value, and there are enough to indicate that they are needed for something like a Big Muff-type of sustain control. The b100k seems to reinforce this. For something adjusting gain off the emitter, you'd see either a 1k or 2k pot, or maybe a 10k pot, biggest.Mich P wrote:Anyone ?
Thanks,
Mich P.
So probably most caps are value of 100n, maybe with 22n or so. There's a diff cap type next to the clipping diodes - probably parallel to it, and probably a value Earthquaker didn't stock in the Panasonic-types. So maybe has a value of 1n or 2n2 - again very common if taking clipping diodes to ground off the collector of q2.
50kb pot - probably tone control either of a Big Muff-type, or maybe just a variation of stupidly wonderful tone control.
Resistor values seem to be standard things with transistors used like with a Big Muff or LPB-1 - I think I see 100r's, 470k, maybe 220r and similar. Also 1k and such, unless I'm just not making out a 3rd or 4th band correctly...
- Manfred
- Tube Twister
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I bought a second hand one and traced it.
It was hard to trace the circuit because it is an multilayer PCB.
The ground connections and some others are on internal layers.
I traced the clipping diodes,a comparison of the reference diodes traces gives BAT48.
The the semiconductor analyzer read HFE=784@5Milliamps for Q1 and HFE=HFE=736@5Milliamps for Q2.
It was hard to trace the circuit because it is an multilayer PCB.
The ground connections and some others are on internal layers.
I traced the clipping diodes,a comparison of the reference diodes traces gives BAT48.
The the semiconductor analyzer read HFE=784@5Milliamps for Q1 and HFE=HFE=736@5Milliamps for Q2.
- Manfred
- Tube Twister
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I designed a stripboard board for, but I haven't actually made use of it.
Print the PDF-files with the original size setting option.
Schematic with added potentiometer connection designations:
Print the PDF-files with the original size setting option.
Schematic with added potentiometer connection designations: