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Found readymade synth modules

Posted: Tue Jul 10, 2018 6:02 am
by timdrage
Seen a couple of nice ideas and am now on the lookout for premade electronic boards or other things which run off 12v / 5v and can be made into eurorack modules with little or no modification :)

Error instruments had the genius idea of cutting the wire off a string of fairly lights and using it as a CV source! (tho it's a bit cheeky to then sell it for so much money considering they're like $3 on alibaba)
https://www.errorinstruments.com/a-4829 ... mander-v2/

+ this kareoke echo board can run off +/-12 rather than the advertised 12v AC (Is this true of all 12v AC circuits!?!?!) so can make an almost instant module, just need to replace the jacks with 3.5mm and maybe add vactrol CV or other mods
http://www.synthanatomy.com/2018/04/diy ... ss-15.html

These kits are nice and can be found cheap, would make a good LFO, not sure yet if they could be modified for voltage control but probably considering the chip they use can be made into a VCO
https://www.ebay.co.uk/itm/XR2206-Funct ... ave-9-12V/

more suggestions please!

Some other hifi tone control/eq boards etc on ebay look promising but not too thrilling too

Re: Found readymade synth modules

Posted: Tue Jul 10, 2018 11:58 am
by WhiteWarlock
voltage regulators are your friends for such Eurorack projects
BTW
you may want checking this out for DIY PCBs
http://nonlinearcircuits.blogspot.com/

Re: Found readymade synth modules

Posted: Thu Jul 12, 2018 8:35 am
by diurnalburdens
I made one of these recently. I made mine as a table top half rack and it runs on 9v but it can be made to run on 12v.
https://www.circuitbenders.co.uk/forsal ... ptaxi.html

Re: Found readymade synth modules

Posted: Thu Jul 12, 2018 9:07 am
by timdrage
you may want checking this out for DIY PCBs
http://nonlinearcircuits.blogspot.com/
Yeah looks great, had seen already but thanks :)

ah yes that thing is great, built mine but not housed it yet. Considered building it as a module but would be too big for my setup and it makes more sense to me in a pedal chain. Going to run it off 12v tho yeah

These look promising, EQ is not exciting but useful:
s-l1600q.jpg
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Stereo 15 Band EQ Equalizer Preamp Board 2.0 Channel Adjustable Audio Tone Board
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New Finished Low-pass Filter NE5532 VC best Process Circuit For Amplifer
Screen Shot 2018-07-12 at 18.07.22 copy.jpg
Screen Shot 2018-07-12 at 18.07.22 copy.jpg (190.43 KiB) Viewed 601 times


Trouble with modular is I just keep having more and more intrusive thoughts about electronics and high-concept setup ideas. :D Now i want to make a whole rack of mediocre ebay hi-fi boards

Re: Found readymade synth modules

Posted: Thu Jul 12, 2018 9:33 am
by WhiteWarlock
Please list some ebay links for those DIY kits!
Looks like some fun
plus very potentially useful

Re: Found readymade synth modules

Posted: Thu Jul 12, 2018 10:07 am
by timdrage
I didn't want to recommend any particular seller, there are 100s of these on there and i haven;t found best/cheapest yet. Search the titles i posted and things like 'preamp board', "PT2399 board" etc and you should easily find tho, let me know if you can't and i can paste some urls some other time soon

the attachments messed up, that last image is "New Finished Low-pass Filter NE5532 VC best Process Circuit For Amplifer"

Re: Found readymade synth modules

Posted: Thu Jul 12, 2018 10:24 am
by WhiteWarlock
Thanks
eye will search sometime soon when have extra time
then order multiple for helping fill new DIY modular case
expect slow boat from china delivery

Re: Found readymade synth modules

Posted: Fri Jul 13, 2018 4:37 am
by timdrage
no probs.

Polyphonic barking dog synth anyone? :chin: https://www.banggood.com/5pcs-3-4_5V-So ... mds=search

Also there are some neat and small phono preamp boards out there, could be good for interfacing turntables (or better still, disembodied record player arms on long cable :D) with synths?

Re: Found readymade synth modules

Posted: Fri Jul 13, 2018 8:57 am
by Bipolar Fucking Joe
Lads, I dunno anything about building modular shit, would you reckon this PSU is a decent starter for some DIY modular shits?

https://www.errorinstruments.com/a-4395 ... -eurorack/

Re: Found readymade synth modules

Posted: Fri Jul 13, 2018 9:25 am
by WhiteWarlock
let me dig you up some "easy" power supply design
also keep in mind you can make some things work with single sided wall wart
look at the old electronics for musicians PDF posted in schematics/circuits

Re: Found readymade synth modules

Posted: Fri Jul 13, 2018 9:25 am
by timdrage
I think it would be OK but I've never used one like that. Plenty of people do tho. You might be able to get one cheaper on ebay/aliexpress tho without a synth shop markup.

I built one of these kits - http://musicfromouterspace.com/analogsy ... SUPPLY.php and then a 2nd one on stripboard.

I made the same ridiculously dumb mistake BOTH TIMES :wall: sneaky circuit, everything is symmetrical except for two near-identically-numbered regulators which of course i got the wrong way round :doh:

Re: Found readymade synth modules

Posted: Fri Jul 13, 2018 9:36 am
by WhiteWarlock
Image
this old book can help get you get started
good starting with comprehending "basics"
viewtopic.php?f=2&t=1537&start=135
MFOS PS is also highly suggested modular PowerSupply design
started DIY modular by building these:+9/-9 +18
lost count of how many have anymore
thus still sometimes design for oldschool DIY voltages filling custom cases
Image
can you post your stripboard PS design for him?
maybe we should start thread for stripboarding?!
looked at those circuits on ebay
said to myself can stripboard them way faster than the shipping time
stop being lazy ass
you have the components in bulk :P
yet instead sitting around in front of computer trying to make LFO/SH/Random do BPM sync midi CC & program changes....

Re: Found readymade synth modules

Posted: Fri Jul 13, 2018 12:32 pm
by timdrage
I built it loosely based on the stripboard layout from http://electro-music.com/forum/topic-35373.html. I made some extra cuts tho in order to add the full Doepfer pins, future proofing so I can add the 5v supply (found some nice pre-made board for that too) and CV/gate or whatever those extra pins are

Image

could do with it being the other way around, as annoyingly my flying bus cable will have to bend awkwardly

Re: Found readymade synth modules

Posted: Fri Jul 13, 2018 2:14 pm
by WhiteWarlock
thanks
much appreciated
some grinch made "stolen" design PCB clone of that PS while ago
he had to eat the batch on muffwiggler
out of respect
since Ray Wilson had just died
dug up so old notebooks of synth designs
(paper/pencil drafted)
will make actual DIY stripboard layout files somewhat soon
after big batch of recording sessions
can start with some super low cost designs
man seriously don't want getting in back of some of my cases...
proto breadboards
that old method can be so fucking stressful
especially if you forgot what you originally did
maybe post that schematic also
just in case anyone is inclined building....
they will need component values

Re: Found readymade synth modules

Posted: Sun Jul 15, 2018 1:42 am
by timdrage
Best to look at the original MFOS for component valued as there are different options for different voltages etc. The component numbers on that stripboard layout are based in the original schematic
especially if you forgot what you originally did
Ha, know this feeling well