DIY Poly ARP

robsol · Posted: Tue Oct 15, 2013 6:09 pm Post subject:

Amazing music and hardware! Shocked

paulstone · Joined: Apr 14, 2013 Posts: 23 Location: ITA

fantastik DIY

paulstone · Joined: Apr 14, 2013 Posts: 23 Location: ITA

Hi Tim and guys
sorry i'm not english native so hope to write in a understandable way Smile

Tim your vco working well the first time i've powered it on , also the
calibration procedure it is comes in a fast way .
now i want build others 3 vco for think in poly like your build , but i've to waiting that the 2N5459 arrive ( bought 50 pics on ebay) and other some miss stuff .
For this first build i've use the 2n3906 instead of the 2n5910 , 4,7pf instead of the 5pf and 2k tempco 3300 ppm instead of the 1.87k 3500 ppm , yeahh work fine equally , but i want use the rigth stuff for the others three vco
for hear if it change some or not .
I've tryed also to replace the CA3086 with CA3046 seems the same
result but i've not dept the change , therefore back with the CA3086 just for respect the original circuit .
In the pcb layout i've change just some pad for add the screw terminals (love this terminals) and the IDC connection because i prefert it .
will post updates when I get the material to build other vco .
Again many thanks Tim for your work Smile

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THeff · Posted: Thu Nov 14, 2013 6:33 pm Post subject:

Thanks for the kind words Muied Lumens! Smile

paulstone,

Nice looking PCB, glad it's working for you. Cool

I will be posting the PCB and build info for the sub oscillator divider soon.

-Theff

paulstone · Joined: Apr 14, 2013 Posts: 23 Location: ITA

THeff · Posted: Tue May 06, 2014 6:55 pm Post subject:

Hi paulstone,

I will try to post the info in the next couple of weeks. I have been out of town and super busy a work. There hasn't been much interest in the subosc divider so I have not been very motivated to post it.

-Theff

skylab76 · Joined: Dec 30, 2007 Posts: 38 Location: Austin

Is there a single strip board version of the Poly Arp? Laughing

isak · Posted: Sun May 11, 2014 9:42 pm Post subject:

Hi THeff.

I finally manage to complit the vco build.
I must say...I love it!
The square sounds very very good, specially with a bit of PW.
As you said it was easy to tune.
I have one thing with the Tri, the top of the Tri is not spiky like it should be, the spike of the Tri is in the opposit way arround, and I actually can hear this, do you have Any idea why it happanes?

Again, I thank you for this amazing vco.
Cheers,
Isak E.

paulstone · Joined: Apr 14, 2013 Posts: 23 Location: ITA

THeff · Posted: Wed May 14, 2014 7:13 pm Post subject:

Hi paulstone,

I'm glad you got the osc divider working, it's a great little circuit.

Isak,

I'm not quite sure what you are seeing with the triangle output but, it sounds like it is folding back on itself. I have never seen this on any of the eight boards that I built so I'm not sure what would cause it.

I can only suggest that you double check the components in the triangle section and make sure there are no solder splashes shorting the PCB traces since they are pretty close together.

-THeff

isak · Posted: Sun May 18, 2014 2:13 pm Post subject:

hi Theff.

thank you for your reply.
i'll do my best to find the problem and let you know.

cheers,
isak E.

isak · Posted: Tue Jun 10, 2014 6:35 am Post subject:

Hi THeff.

i didnt manage to fix the issue yet.
i thought maybe a pic of the tip tri wave shape will help?
this is what i see:

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and the top it is not steady, it always moves.
any ideas? Confused

cheers.

elmegil · Posted: Tue Jun 10, 2014 7:52 am Post subject:

Is there any trim for the triangle? I've seen sort of similar things in other VCOs where the up ramp and down ramp sides of the triangle didn't meet correctly, normally there's a trim to line them up....

isak · Posted: Tue Jun 10, 2014 8:35 am Post subject:

Yes, there is a trim, but when I trim it to be centered the top of the Tri is going inside and it's hearible!

Have a look!

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THeff

Greetings all,

I haven't posted anything in a very long time so I thought I would drag out the PolyArp and see what I could do today. I found a MIDI file lurking on my computer with no name, just a number. It has a lot of cool arpeggios so I made a recording of it. All of the sounds are from the PolyArp, except the drums.

Since it didn't have a name, I called the song ArpAmbience. If you recognize it, please let me know.

Cheers and Happy New Year!

THeff

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Broadwave · Posted: Mon Dec 28, 2015 1:09 am Post subject:

isak · Posted: Mon Dec 28, 2015 1:13 am Post subject:

Cheers Andy Smile

paulstone · Joined: Apr 14, 2013 Posts: 23 Location: ITA

Hi guys
happy new year !

W arp clone thanks again to Theff for the vco and also Andy for the 4023 filter , love both !!

if you have others DIY pcb clone (any type) for the arp world , please posted here Smile

ciao
Paolo

stringsthings · Joined: Feb 07, 2015 Posts: 11 Location: US

THeff,

this is some awesome synthy stuff !! Very Happy

I was searching around for Bergfotron info and ran across this thread. Love the demos. And that synth is so impressive. I'm just getting into synth DIY ( pretty experienced in general electronic DIY ) and Im putting together a few VCO's and power supplies to get started.

Maybe someday in the future, I'll borrow one or more of your ideas here ! Very Happy

THeff · Posted: Sat Jan 02, 2016 6:00 pm Post subject:

Thanks stringsthings,

I wasn't sure how playable it was going to be due to the pitch drift of the four analog VCOs, but I am very pleased with the results. I made an attenuation patch cord so that I could plug a guitar tuner into the Sine output of each oscillator and that makes tuning fast and easy. I hope you build a cool synth in the near future.

Regards,

-THeff