I will do as you suggested, appreciate the link stmllr and grateful for the cooperative guidance 
It turned out that the schematic for the 4011 modulator comes from the Korg MS-20. I managed to shrink the stripboard layout to a 12x12 board but I am hesitating to post my version here as I am not 100% sure that the circuit works as intended. Here are the issues:
- I assume that this circuit only works with square waves at the inputs, with no output when the inputs are anything else?
- I did try inputting the square wave outputs of a test oscillator (based on the CD40106) and it worked as expected, and so did when I tried any combination of the 40106 outputs, a 555 clock (in the audio rate), and the square LFO out of a Behringer Crave (again, in the audio rate). However, I get no output when I try the oscillator pulse wave output of the Crave. Both LFO and oscillator outputs are supposed to be in the +/-5V range. I am missing something?
Perhaps those who are more familiar with the circuit and its operation can advise, before I post my version as a working module!
I haven’t finished the panel yet, but it’s connected and working, so you can consider this verified. I got the idea to make a Boss CE-2 (it’s that famous chorus guitar pedal) LFO from @benjiao who has his own CE-2 project. My version is closer to the service manual schematic with a single triangle out through a 2SC945 transistor buffer and the Depth 1 lug connected to 4.5V. I adjusted the output to get a, roughly 0-5Vpp output, added an LED indicator, and a switch in between the rate capacitors (for which I used sockets to change them if need be). The original called for 100nF, but I found that 47nF and 1μF give a more useful range (@benjiao used 1μF and 10μF). As usual, the stripboard layout is tight and can fit behind a 2.5cm Kosmo panel.
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Plug this into the cutoff CV input of a lowpass filter and you get an instant Karn Evil 9 (1st Impression Part 2) sound 
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I’m after a simple vero board layout for amplification. I need a module that will provide at least 10x non-inverting amplification.
I know I just need an Op Amp and can design my own amplification circuits (inverting and non-inverting)
Do you lot have a verified one? I’ve only ever soldered PCBs before and am nervous about getting the power supply stuff correct.
If you can draw a schematic, I’ll put together a stripboard layout for you.
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wonderful, thankyou! A mate’s helping me out with some bits this evening which may give me the confidence to push on.
If not I’ll prod on here once I’ve drawn it… Thanks!
I wanted a buffered multiple with three outputs, so I put together this one, which combines the design of Analog Output Buffered Multiples (output resistor in the loop) and the +/- voltage indicator from Skulls & Circuits Buffered Multiple. Unless @analogoutput tells me that there is something wrong in combining the resistor in the loop design with the LED indicator of that “spare” op amp, I’ll label this as verified as I’ve built one and works fine as far as I can see.
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Hey K.ostas! I’ve just finished editing a veroboard layout for a Dual Boost module. I’d love it you and others could take a look and let me know if I’ve done anything crazy!
MORITZ KLEIN Kick Drum.
EDIT updated transistor id.
well ,its in my rack and working . Ripple police yes I`m guilty.
havent tried the cv inputs …dont need more patching but should be correct.
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CGS60 line to eurorack level.Stomp box adapter simplified.
EDIT . just tried with unboosted guitar signal into MS20 vcf clone and sounds just about spot on. enough ,but not too much gain.
ok while Im at it, a very simple but useful
utility. Needed something to raise mixer levels to sample into SQUID salmple.
very basic iteration , but seems to do the job.
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4 INPUT panning mixer.
needed another submix for the rack.
bare bones and easy. You`ll have to use your noggin and repeat the other 3 inputsof course but does the job anyway.
probably sourced from MFOS.
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Amazing @Unauthorised_service … I might well have a go at the kick drum when I’ve debugged my dual boost board.
How are you lot getting the little compact 3-pin power connections? Are there cables I can buy that come from Eurorack power to those connectors?
Also what editor are you using for stripboard layouts?
Yes indeed. thanks man!
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ok
something like this worked for me.
and then to save more pennies I purchase a metre perhap of broad ribbon cable and tear off in strips of three. I spent (more than) a couple of hours redoing all my power and modules .
just used pliers for crimping but others may be more professional in their methodology !
stripbpoardCAD on the app store is still live, and has been a godsend for most of my modules .
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Ah ok… ive only got 16 pin headers on my power supply… so a three pin header added at the other end of that would just give me a negative and two grounds… looks like im sticking to big headers for now?
I’ve verified my build of Benjiao’s Dual Boost! It brings external gear up to modular level and can add a nice fat bit of distortion if cranked.
Discussion here: Benjiao Modular Dual Boost on stripboard - #16 by tristan
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Hello 
I’ve gleaned much from this thread… In the spirit of giving back, here is my verified layout of a PT2399 Delay, based on MiniDelay · benjiaomodular
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