[sdiy] Converting a Meng Qi voltage memory to banana FRAC format

Matthias Herrmann matthias.herrmann at fonik.de
Mon Jul 27 14:49:00 CEST 2020

But they will not hold the front panel to the PCB anymore. That is the reason i would prefer the Johnson type banana.

(not that there was'n a workaround for that)




From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of thresholdpeople via Synth-diy
Sent: Monday, July 27, 2020 2:18 PM
To: synth-diy at synth-diy.org DIY
Subject: Re: [sdiy] Converting a Meng Qi voltage memory to banana FRAC format


Yep, exactly. Those jacks used to also come in different colors, wasn't able to find any during my quick search on ebay, but I'm sure they're still out there. If the Johnson / Cinch jacks fit, it should be the same thing really.




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On Sunday, July 26, 2020 11:53 AM, Spiros Makris <spirosmakris92 at gmail.com> wrote:


So basically those are bananas that don't need to extend beyond the PCB? So I would pretty much have to screw them in the panel and solder a wire from their solder lug to the PCB?

That's good, I'll look more into those plugs.


On Sun, Jul 26, 2020 at 4:33 PM thresholdpeople via Synth-diy <synth-diy at synth-diy.org> wrote:

I'm not sure if anything's changed from the original module to the kit, but at least with the original the board was exactly the same for both the 3.5mm and banana version. 


Cinch/Johnson bananas won't fit without modification as Matthias mentions... the original used banana jacks which looked very similar to these (I don't have it anymore so I can't verify if the dimensions provided are the same, but I'd imagine so): https://www.ebay.com/itm/50pcs-Banana-Jack-Socket-Binding-Post-Test-Probe-for-4mm-Banana-Plug-Black-Red/264765586993?hash=item3da5423e31:g:Y0oAAOSwiX9e6I-9. 




‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Sunday, July 26, 2020 8:24 AM, Matthias Herrmann <matthias.herrmann at fonik.de> wrote:


When using the Johnson / Cinch Banana sockets from mouser you would need a 5.0mm/0.185 hole in the PCB for the solder lug.

Just be sure that you cut and bridge the traces that are running below the sockets.

The height should not be a problem with the Johnson type banana sockets.




From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Spiros Makris
Sent: Sunday, July 26, 2020 12:13 PM
To: synth-diy mailing list
Subject: [sdiy] Converting a Meng Qi voltage memory to banana FRAC format


Hello list,

I am asked by a friend if it is possible to get a eurorack Voltage Memory and covert it to fit with the rest of his rig, which is, mainly, a bugbrand synth voice.

The PCB pic I can see from modular addict, for the eurorack version, doesn't seem accommodating to bananas. I could widen the wholes already present for the 3.5mm jacks on the PCB, but I'm not sure if there's enough space...

I think widening the wholes on the Panel is very easy so it doesn't feel concerning at this stage.

Any kind of advice is greatly appreciated!






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