Posted: Thu Mar 31, 2011 3:44 am Post subject:
PCBs for Thomas Henry's X-4046 VCO Subject description: re-ordered a few spares...
Hi all,
quite some time ago Thomas asked me to do a test built of his X-4046 VCO. on this occasion i made some proto PCBs for the VCO core + expo current source (tri/saw outputs). Later on i made a 2nd PCB with the waveshapers (tri2sine/pulse/PWM + rampoid).
All worked out very well and i built a Dual VCO module from it (refer to pictures and sound samples below). The VCO pleases me very well and it now the bread-and-butter VCO of my system. BTW i calibrated it using my 12V rig, now i use it with 15V without any changes...
building docs for the fonitronik PCBs can now be found here:
TH X-4046 VCO doc 5/30/2011 (rev2)
old documentation had an error: R2 must be 390R (NOT 100k)
now the good news: Thomas gave me his GO for doing a PCB run for this project. so i would offer a PCB for the VCO core + expo current source and a 2nd PCB with the waveshapers (which you could use independently) - as long as there is enough interest. so just indicate your serious interest in this PCBs.
the PRICES (revised for low quantity re-order)
7.- EUR/10.-USD for the VCO core PCB (saw/tri)
and
5.- EUR/7.-USD for the waveshaper PCB (tri2sin/pulse/PWM)
PCB measurements:
_________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source Last edited by fonik on Wed Aug 08, 2012 4:40 am; edited 11 times in total
Joined: Jun 27, 2007 Posts: 50 Location: Stockholm, Sweden
Posted: Thu Mar 31, 2011 5:55 am Post subject:
4 of each PCB for me! I must keep the collection of TH and Fonik thingys growing in order to grow the modular in progress thus attaining moar patchcord pasta.
Joined: Oct 11, 2006 Posts: 271 Location: Far in the north
Audio files: 1
Posted: Thu Mar 31, 2011 8:32 am Post subject:
NOOOOO!!! Another project... And I think I have most if not all the parts in stock already. Just when I thought I had to stop building electronics stuff (at least for some time, after finishing my studio rack project) and my modular enclosures have been full for a while....
Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD
Posted: Thu Mar 31, 2011 12:03 pm Post subject:
TekniK wrote:
Damn,why 2 pcb's when you simply can merge both on one and manufacture it for the same price...
Probably 'cause some people (like me) intend to order some of the waveshapers separately so that they can use them elsewhere. I hate building PCBs from scratch so if there's a waveshaper that'll take a tri and convert it into sine/pusle/pwm...why the heck not order some for use in other projects? _________________ Looking for a certain ratio since 1978
Damn,why 2 pcb's when you simply can merge both on one and manufacture it for the same price...
Probably 'cause some people (like me) intend to order some of the waveshapers separately so that they can use them elsewhere. I hate building PCBs from scratch so if there's a waveshaper that'll take a tri and convert it into sine/pusle/pwm...why the heck not order some for use in other projects?
You have to quote my whole post not just a part of it,then there is no reason..
<snip>,why 2 pcb's when you simply can merge both on one and manufacture it for the same price
You could have done the shaper on one pcb and the full vco on another pcb
there is no logic into it,sorry
the PCB designs are already tested, since i made them for test-build purposes. they require no additional prototyping. a re-design would have required a complete prototype build again.
i asked for opinions on the 1 vs 2 PCB issue, and got almost no response, despite a few people saying they prefer two PCBs, or they don't care.
even logic depends of piont of view. _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
i tried an ON Semiconductor MC14046BCP first and could not get it scaled correctly. it fell short of about 1/4 tone per octave.
i then tried the NXP part and scaled the VCO within 5 minutes using an LFO and a quantizer.
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