Earthquaker Devices - Crimson Drive  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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RnFR
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Post by RnFR »

well, there goes the "original" thing! :lol:
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culturejam
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Post by culturejam »

RnFR wrote:well, there goes the "original" thing! :lol:
Hey, it's got a buffer!! That's pretty new.

At the very least, the build quality looks to be pretty good, and the prices aren't insane.

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mich
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Post by mich »

So based on the schematics here, I did a board mounted pcb layout. I included a partlst but I have to confess I'm not sure about the fractional-value capacitor listings
Layout.png
Layout.png
Parts list:
Part Value Package Library Position (inch) Orientation

+9V1 +9V(T) SQUARE gm-supply (1.45 0.7) R0
C1 100n 070X030_3 gm-caps-film-chicklet (0.5 2.45) R0
C2 1/50 050_020_2 gm-caps-electro-pol (0.2 0.6) R180
C3 100/16 050_020_2 gm-caps-electro-pol (0.3 1.35) R180
C4 100/16 050_020_2 gm-caps-electro-pol (1.7 0.8) R0
C5 10/16 050_020_2 gm-caps-electro-pol (0.9 2.45) R0
C6 100N 070X030_3 gm-caps-film-chicklet (1 2.15) R270
C7 100P 070X030_3 gm-caps-film-chicklet (1.65 1.65) R180
C8 100/16 050_020_2 gm-caps-electro-pol (0.7 1.5) R90
C9 1/50 050_020_2 gm-caps-electro-pol (1.25 2.25) R0
D1 LED5MM LED5MM gm-diodes (1 1.1) R90
D2 1N4148-3 DO35-3 gm-diodes (1.65 1) R0
D4 1N60P DO35-3 gm-diodes (1.45 2.05) R0
D5 1N60P DO35-3 gm-diodes (1.65 1.15) R0
D6 1N4001 DO35-3 gm-diodes (1.6 2.3) R270
GAIN 100kB POT gm-pots (0.5 2.65) R0
GND2 GND(T) SQUARE gm-supply (0.2 0.1) R0
IN SQUARE gm-supply (0.35 0.35) R0
LEVEL 100KA POT gm-pots (1.5 2.65) R0
OUT SQUARE gm-supply (1.5 0.4) R0
Q1 J201 TO92- gm-trans (0.8 2.1) R90
Q2 AC128 TO5 gm-trans (0.95 1.75) R270
R1 10K R0207/4 gm-resistors (1.2 0.85) R180
R2 2m2 R0207/4 gm-resistors (0.55 0.4) R90
R3 4k7 R0207/4 gm-resistors (1.3 2.45) R0
R4 1M R0207/4 gm-resistors (0.35 1.8) R90
R5 1M R0207/4 gm-resistors (0.4 2.15) R180
R6 4K7 R0207/4 gm-resistors (0.5 2.3) R180
R7 68K R0207/4 gm-resistors (1.3 1.45) R90
R8 470K R0207/4 gm-resistors (1.6 1.3) R0
R9 2K2 R0207/4 gm-resistors (0.55 1.8) R270
R10 15K R0207/4 gm-resistors (1.6 1.85) R0
STOMP 3PDTBLUE CHINABLUE gm-switches (1 0.4) R0
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300 dpi
300 dpi
PNP_transfer_RP.png (10.97 KiB) Viewed 3690 times

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RnFR
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Post by RnFR »

the "fractional value" is just value/voltage. thanks for the layout!
culturejam wrote:
RnFR wrote:well, there goes the "original" thing! :lol:
Hey, it's got a buffer!! That's pretty new.

At the very least, the build quality looks to be pretty good, and the prices aren't insane.
yeah, I like their stuff. I'm definitely a fan of the sounds that he focuses around, and the general aesthetic is very cool, too.
"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

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Post by Hides-His-Eyes »

Make sure those pads are big enough for 2mm drills.
Testing, testing, won too fwee

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RnFR
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Post by RnFR »

that's a good point. I've recently started doing some more iron on transfer etching, and I'm really not having fun. I've decided to start making the pads huge, even though I generally use #68 drill bits, and at least .05 traces for easier etching.
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Post by culturejam »

I've moved the etching methods discussion here:
https://www.freestompboxes.org/viewtopic ... 22&t=12971

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Post by Bastelfixx »

Please can tell me somewone, what a hFE ist the best value for the AC128

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Post by muskelproz »

Actually i can't, but here's a vero layout i did a while ago for practising purposes. ;)
I would be glad if someone could check this, its not verified yet.
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Post by IvIark »

Dirk, is the orientation of C3 and C7 correct? C3 with positive to input and negative to supply for C7? :?:
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Post by hazefuzz »

Can someone give me is voltage reading on J201 and ac128
thanks

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Post by hazefuzz »

Can someone give me his voltage reading on J201 and ac128
thanks

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Post by Manfred »

The AC128 transitor has a widely spread in DC-current gain,
if only because it is essential to know the gain of the used one to ensure the funktion of the device.
I would appreciate very much, if someone could measure the voltages on the transistor leads and Vcc as well at the original device.

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Post by Manfred »

Manfred wrote:The AC128 transitor has a widely spread in DC-current gain,
if only because it is essential to know the gain of the used one to ensure the funktion of the device.
I would appreciate very much, if someone could measure the voltages on the transistor leads and Vcc as well at the original device.
The Q2 stage is derived from the Dallas Rangemaster circuit, from there the gain range of the applied AC128 should be 80 - 100 for best sounding.

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Post by Manfred »

I took a snapshot of the Crimson PCB on a demo video.
EQD_CrimsonDriveShot.jpg
There are a glass Germanium transistor and two original 1N60 are applied.
Which PCB-type is built-in at the latest Crimson version.

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Post by Manfred »

The version with the OC139 NPN Germanium Transistor is definitely the last one.
Can anyone take a better photo of the PCB and excerpt the part values?
I would appreciate it very much.

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Post by Manfred »

I have seen that the device is not longer in the product range, I suppose the OC139 transistors are now very rare.
Here the the traced schematic of the OC139 version:
EQD_CrimsonDriveVersion2.JPG

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