Manhattan Analog Discrete SV-VCF PCB/Panel

Manhattan Analog's Discrete SV-VCF is a multimode filter consisting of a State Variable Filter combined with a CP3 mixer.

This is a PCB/Panel set in the Eurorack format.

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Jason from Manhattan writes:

“It started life as the SVF design (based on the J. Haible discrete 2040 gain cell) which Scott Stites posted over at electro-music in April. I’d been wanting to work with another filter for a while and this one looked interesting, so I started playing with it. I lopped off the audio input section and grafted on the CP3 mixer (moar transistors!) and that’s what you’re hearing in this rather short clip. It’s definitely interesting! A very thick, rich-sounding filter with a lot of different personalities depending on how hard you drive the inputs. “

The Manhattan Analog Discrete SVVCF multimode filter consists of a State Variable Filter combined with the CP3 Mixer.

The CP3 Mixer is based on the old Moog Modular mixers that have a beautiful overdrive to them.

This combinations makes the filter very unique and capable of many different tones depending on how hard you drive the inputs.

• Cutoff Control
• Resonance Control
• CV1/CV2 Inputs & Attenuators
• Mix Phase Control
• 3 Audio Inputs
• 3 Input Level Controls
• Mix, Br, Hp, Bp, Lp Outputs

Specs & Downloads

Specs & Downloads

Manufacturer Manhattan Analog
HP 14
Depth 45mm
+12V 30mA
-12V 30mA
+5V No
Additional Resources Thread and BOM


Customer Reviews (1)

Unique Moog And Oberheim Hybrid Sounds!Review by Mr_Mojo_Risin'
This module is similar to Oberheim's SEM filter and the mixer is inspired by Moog's CP3 module... also built with transistors which gives it a distinct sound. Although this is a labor intensive build, the end results are worth all of your efforts. My best advice for this build is to take a little time and do some research before you start building. If you focus too much on some of the earlier posts at Muff Wiggler, you will be thoroughly confused because they deal with other PCB versions. I definitely got lost because of "too many" suggestions. I found only a few posts which were actually relevant for my build (v1.4/Main Board + v1.3/Jack Board). For calibration, you will need to check out the info at this thread posted by user "negativspace" (Manhattan Analog). Search for the phrase "Holy crap, this isn't hard" ;^)

My Build Notes:

1) I used Tayda 16mm pots with solder lugs as suggested by one Muff Wiggler. Big huge mistake. I was trying to save $$$ by using what I had in my parts kit. The amount of extra time I spent soldering these using solid wire was a giant hassle. Be sure to use right angle PCB mount pots which look like this: (they are the same price as pots with solder lugs)

- Right Angle PCB Pots -
[3] B100K - (CV1/CV2/Notch) Tayda SKU: A-1628
[1] B10K Dual Gang (Resonance) Tayda SKU: A-1997
[1] B10K (Frequency) Tayda SKU: A-1624
[3] A25K (IN1/IN2/IN3) Unfortunately, Tayda does not stock any of the A25K right angle variety. Search Mammoth for those

2) As suggested by the designer, I opted to use a 1K Tempco resistor at PCB silkscreen location R44*. This special resistor is available from Modular Addict. From what I've read about this, after being powered up for 2+ hours in the case, components tend to heat up and this Tempco is there to prevent temperature drift for that part of the circuit

3) I was unable to find a BOM or build docs at the Manhattan Analog website but I did find a good BOM at this link for reference:
There is also a Mouser Cart BOM at the Muff Wiggler link above but use that one with caution! Some of the transistors and other parts listed there are _quite_ expensive. The BOM total $$$ was _much_ higher than the parts I was able to source from Modular Addict and Tayda. With the exception of the Styrene Caps (P/N: 23PS210), Ferrite Beads and LM377, I was able to source all components from Modular Addict and Tayda

4) There are 13 SMD components. Two on the Main Board and eleven on the Jack Board. For the PCB versions listed above, the components are placed as follows:

Jack Board (Back)
(2) 0.1uf Caps @ Pad Locations Marked ".1"
(2) 22pF Caps @ Pad Locations Marked "C"
(2) 330R Resistor @ Pad Locations Marked "3"
(4) 47K Resistor @ Pad Locations Marked "4"
(1) TL072CDR IC @ Pad Location Marked "072"

Main Board (Back)
(2) 0.1uf Caps
Note that if you use a 1K resistor on the front of this board at PCB silkscreen location R44*, there will be two pairs of SMT pads which are not used and left unpopulated. One pair of pads is used for for a 1K SMD mounted resistor (I used a Tempco through hole resistor on the front instead) and the the other pair of pads have large holes in them and are used only as test points. Compared to these test pads, the pads I populated with the 0.1uf capacitors have very, very small holes drilled in them. Much smaller than the test pads. I don't like working with SMD stuff but found all of these components were very easy to solder by hand using a fine tip iron

5) Some of the BOM's floating around are showing expensive bipolar transistors. The designer pretty much says not to bother using expensive transistors. Standard 2N3904 and 2N3906 transistors will work just fine. Quote from the designer - "I couldn't justify $6 for 4 transistors - x4 per board - when 2N390x at $0.02/ea work and sound just as nice. As far as matching goes, I've built them with matched and unmatched transistors and couldn't really tell any difference. I recommend loosely matching them as a matter of best practice but it's not something you should worry about."

6) I socketed the resistor at PCB silkscreen location R13* on the Main Board. The designer mentions this value can be experimented with to fine tune the mixer/filter sections. I am currently using a 330K resistor here (the default value is 390K) and it sounds great. As another builder mentioned, this 330K value slightly tames the resonance. I will experiment with other values later on. Suggested values to tinker with here are between 270K and 470K

So far I'm really digging this module. I built two and am happy to report these make a good substitution for the Oberheim synth sound I've always craved but never owned. Here are some links with a good collection of demos: - (This video demonstrates a very cool effect similar to a track titled "905" on The Who's LP "Who Are You?". That track was played on one of the first multiphonic Polymoog synths way back in 1978. Another synth I've heard which comes close to this great effect is the Roland Super JX-10 / MKS-70 - Patch G-3: ROBODROID DELUXE 39 47) - (A very detailed overview and demo by DivKid) - (A collection of audio demo clips. Check out "Bendy Bandpass"... oh yeah!) (Posted on 6/20/2018)

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