[IN STOCK] DTM: Moog CP3-type discrete mixer PCB, Euro panel

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negativspace
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[IN STOCK] DTM: Moog CP3-type discrete mixer PCB, Euro panel

Post by negativspace » Sat Aug 24, 2013 4:19 am

Having worked with this circuit block as part of my upcoming VCF and remembering this recent thread we had about it, I thought there might be some interest in a standalone PCB for the Moog CP3 mixer. I've just finished building a prototype and everything works, so unlike most of my projects this one is already all set to go.

The PCBs are 1.5" x 3" - virtually identical in size to the CVP. Like the CVP this one includes 2 holes for mounting on standoffs as well as a split Euro/MOTM power footprint. It will run on 12 or 15v supplies as it includes an onboard regulator for both the +12v and -6v rails. It's therefore suitable for use in any format.

Image

BOM

Resistors:
[2] 100R
[1] 200R
[1] 240R
[2] 560R
[1] 6.8k
[2] 15k
[3] 22k
[1] 47k

Capacitors:
[2] 10/22/47uF electrolytic
[2] 0.1uF ceramic
[1] 3.3nF poly
[1] 10uF electrolytic [SILKSCREEN REVERSED ON V1.2 PCBs]
[1] 10uF electro; optional for +12V regulator

Pots:
[3] 10-50k audio, 9mm Alpha or similar
[1] 25-50k linear, 9mm Alpha or similar
[1] 2k multiturn trim
[1] 100R multiturn trim

Transistors/ICs:
[1] LM78L12; optional for +/-15V supplies ONLY
[1] LM337LZ - be sure to get the one in the TO-92 package [SILKSCREEN REVERSED ON V1.2 PCBs]
[2] 2N3904 (or similar NPN) - Matched pair (optional)
[2] 2N3906 (or similar PNP) - Matched pair (optional)

Misc:
[1] 10-pin .100 header, male (Euro power) OR 4-pin MTA-156 header (MOTM power)
[2] Ferrite bead (can substitute 10R resistor)
[2] PTC resettable fuse (.050 hold, .100 trip) - can replace with wire link
[2] 1N4001 diode
[4] 3.5mm jack, 16PJ138 or Erthenvar/Thonk style
[4] Davies 1900H-style knob, or any other ~12.5mm-diameter knobs you prefer.

TRIMMING
1) For use with +/-12V supplies, jumper pins 1 and 3 of the 78L12 and omit the adjacent cap.
2) Adjust the 2k trimpot until the output of the LM337 is -6.0V.
3) Adjust the 100R trimpot until the output has no DC offset with the output knob at 12:00.
Last edited by negativspace on Mon Sep 04, 2017 4:45 am, edited 19 times in total.

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negativspace
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Post by negativspace » Sat Aug 24, 2013 4:19 am

Payment
The PayPal address for payment is jcoates42@gmail.com.
PLEASE include your username here at Muff's in your payment notes. It's difficult to manage the orderlist if I can't match names to payments.

Prices
Circuit Board: $10/ea
Eurorack Panel: $15/ea
Shipping: $3/USA, $10/International, one charge per order.

Order List (blue indicates paid, red indicates shipped)

negativspace [20] [20]
woodster [2] [2]
bernd.wender [2]
Cheradenine [4]
Lofi Junglist [1] [1]
Steffensen [2] [2]
regenbot [1] [1]
nikmis [2]
kbo [1] [1]
rosch [2] [2]
monobass [1] [1]
logicgate [2] [2]
thebot [2]
EMwhite [2]
analogdata [2] [2]
wavehead [3] [2]
lazerkind [2] [2]
baszline [1]
cyklopljud [1] [1]
Rigo [2] [2]
Glacial23 [2] [1]
pre55ure [1] [1]
hsimonis [2] [2]
moogah [2] [2]
reggiechacha [2] [2]
dogmeat [2] [1]
diablojoy [2]
Stab Frenzy [4] [4]
Norman Phay [2]
msprigings [1]
Luka [2]
carynrich [2]
mono-poly [2] [2]
Dubka [1] [1]
oootini [1] [1]
monstrinho [2] [1]
mush [1] [1]
lordofthebored [2]
nickster [1] [1]
sinemod [4] [4]
onlyHzwhenI... [3] [1]
kcr [1] [1]
limpmeat [2] [2]
freeyerheel [4]
bensaddiction [1] [1]
Morbid [1] [1]
jgb [4] [4]
gbiz [2] [1]
Synthsense [2] [2]
oberkorn [6] [6]
gde [1] [1]
jflower [3] [3]
frozenkore [2] [2]++
ThecureForSin [2] [2]
analogdigital [2] [2]
modelo [1] [1]
Mig27 [10] [10]
raisinbag [3] [2]++
M-circus [1] [1]
incekt [2] [2]
bananeurysm [4]
cane creek [2] [2]
tony d [2]
samih [1] [1]
Funky40 [5] [3]
twospartans [3]
spotta [2] [2]
aladan [4] [2]
filterstein [2]
synthnut [8]
ben_hex [2] [2]
thetwlo [1] [1]
defenestration [1] [1]
hv0190 [2]
JasonMichener [2] [2]
Karl_Joseph [1] [1]
Dogue [1] [1]
DannoGeeRay [2] [1]
Dego [1] [1]
xpmtl [1] [1]
grilojoe [2]
dropmotif [2]
numan7 [2] [2]
pulse_divider [9] [4]
ezehagar [2] [2]
LexTron6k [1] [1]
Juxwl [1] [1]
ossi_fx [2]
nangu [6] [6]
sammy123 [1] [1]
Bakeneko [1] [1]
desdinova [2] [2]
lessavyfav [2] [2]
demian [1] [1]
rove74 [2] [2]
tds [1] [1]
mattrick [4] [4]
NV [2] [2]
Isaiah [2]
Paradigm X [2]
cillianjohn [1] [1]
cleahy [2] [2]
spunkytoofers [2]
mxmxmx [2] [2]
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Last edited by negativspace on Thu Jan 23, 2014 4:52 pm, edited 156 times in total.

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woodster
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Post by woodster » Sat Aug 24, 2013 4:30 am

I'd take one.
Is there a big difference between this and the MA Mix ?

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woodster
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Post by woodster » Sat Aug 24, 2013 4:30 am

double dip :doh:

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bernd.wender
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Post by bernd.wender » Sat Aug 24, 2013 4:46 am

I'd be interested in the PCB only. Anybody interested in building an MOTM panel for this little guy?

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negativspace
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Post by negativspace » Sat Aug 24, 2013 5:20 am

woodster wrote:I'd take one.
Is there a big difference between this and the MA Mix ?
In function, no. Pretty much the same thing.

In execution, yes, very different. This is a discrete transistor circuit known for its interesting clipping behavior where the mix is an opamp-based circuit with an emphasis on a clean, transparent audio path.

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Cheradenine
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Post by Cheradenine » Sat Aug 24, 2013 5:24 am

Would be a nice change from opamp-based mixer !
So I'm interested for at least 4 PCBs, maybe more depending on final price.
Last edited by Cheradenine on Sat Aug 24, 2013 5:25 am, edited 1 time in total.

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Post by Cheradenine » Sat Aug 24, 2013 5:24 am

:roll:

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Joe.
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Post by Joe. » Sat Aug 24, 2013 5:29 am

I'd like 1.

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woodster
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Post by woodster » Sat Aug 24, 2013 5:32 am

Many thanks for the info negativspace.
I'll take two!
Have your Mix module and use it all the time, having a mixer with some character in the same size panel would be cool.

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woodster
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Post by woodster » Sat Aug 24, 2013 5:32 am

:bang:
Duplicate post again.

Any new news on the SVF ?

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steffensen
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Post by steffensen » Sat Aug 24, 2013 5:42 am

1 PCB & 1 Panel thanks. :)

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negativspace
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Post by negativspace » Sat Aug 24, 2013 5:45 am

Yeah, bad night for double posts I guess.

SVF is coming along, but I have some building to do so it's on the back burner for a couple of weeks. Aiming for a finished prototype by the end of next month. :tu:

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Post by regenbot » Sat Aug 24, 2013 6:04 am

i'll take one set :tu:

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Post by nikmis » Sat Aug 24, 2013 6:21 am

I would like two PCBs but no panels, please. I was just going to perf-board a transistor mixer, but I am very lazy.

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kbo
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Post by kbo » Sat Aug 24, 2013 7:11 am

One set please ! :sb:

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Post by hexinverter » Sat Aug 24, 2013 7:45 am

Two for me! (panels and PCBs)
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rosch
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Post by rosch » Sat Aug 24, 2013 8:39 am

i'll take 2 (pcbs and panels)

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Post by Thonk Support » Sat Aug 24, 2013 8:47 am

1 set for me please.
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logicgate
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Post by logicgate » Sat Aug 24, 2013 8:47 am

This is like the STG mix?

This would be a nice companion for the Minimoog filter clone!

I'm in for four pcb's and panels!

Cheers!

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thebot
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Post by thebot » Sat Aug 24, 2013 9:00 am

Two pcbs for me please!

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EMwhite
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Post by EMwhite » Sat Aug 24, 2013 9:13 am

I'd like two mix boards minimum;
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analogdata
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Post by analogdata » Sat Aug 24, 2013 12:06 pm

want two.
pcbs+panels

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Post by wavehead » Sat Aug 24, 2013 1:56 pm

3x pcb/panel

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Post by lazerkind » Sat Aug 24, 2013 2:06 pm

Yay, one set please. :yay:

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