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 Forum index » DIY Hardware and Software
Maplin voice changer kit
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LektroiD



Joined: Aug 23, 2008
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PostPosted: Mon Oct 13, 2008 9:37 am    Post subject: Maplin voice changer kit Reply with quote  Mark this post and the followings unread

I've just built one of these, apart from the instructions assuming you're a numb skull, it's quite interesting.

http://www.maplin.co.uk/Module.aspx?ModuleNo=220042

http://www.maplin.co.uk/Media/PDFs/N40FL.pdf

I'm wondering what modifications I can make to make it usable within a synth? I know I need to put a resistor at the input stage to bring it to line level, but I wonder if there are some tweaks I could do to it which would make it more interesting.
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EdisonRex
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Joined: Mar 07, 2007
Posts: 4552
Location: London, UK
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PostPosted: Wed Oct 15, 2008 2:47 am    Post subject: Reply with quote  Mark this post and the followings unread

I had my son build one of these last year. Unfortunately the HT8950A is a one trick pony, and other than possibly doing some circuit bending with it, it pretty much does what it says it can do on the datasheet.

To make this into a module (and I thought about this too) would require some mods, first off, it's only a 4V max supply. Second, you'd have to desolder the onboard switches to carry them to panel mount switches. Third you'd need to deal with the mic level, and you'd need to deal with the speaker level out, and remember that if you hooked it up to a +-12 or 15 based module with 10V signals you'd have a lot of issues.

It's a cute project, but there are other more useful projects in that particular kit collection (the function generator for example).

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vtol



Joined: Sep 25, 2008
Posts: 14
Location: russia

PostPosted: Wed Oct 15, 2008 12:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

i have made a synth with this chip - http://samoletuvvp.narod.ru/vto/diy/sun.html
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vtol



Joined: Sep 25, 2008
Posts: 14
Location: russia

PostPosted: Mon Dec 08, 2008 12:44 am    Post subject: Reply with quote  Mark this post and the followings unread

and one more ht-8950 based project

http://samoletuvvp.narod.ru/vto/diy/guitar.html
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fluxmonkey



Joined: Jun 24, 2005
Posts: 704
Location: cleve

PostPosted: Mon Dec 08, 2008 9:20 am    Post subject: Reply with quote  Mark this post and the followings unread

also check DH Pitch Shifter at general guitar gadgets. PCB available; you'd need something like one of ken stone adapter boards to adapt it from/to modular levels
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synthmonger



Joined: Nov 16, 2006
Posts: 578
Location: flada
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PostPosted: Thu Dec 11, 2008 1:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

I breadboarded a few different designs of this. My finalized design incorporated my vcovr to control the pitch and I replaced the switches with electronic switches.

There is a drawback using electronic switches though. When lowering the pitch the electronic switches don't register as quickly. Also, the e-switches don't register very well at high frequencies. They're fastest switching rate is just above lfo speeds.
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vtol



Joined: Sep 25, 2008
Posts: 14
Location: russia

PostPosted: Sun Dec 21, 2008 7:40 am    Post subject: Reply with quote  Mark this post and the followings unread

http://samoletuvvp.narod.ru/vto/diy/8bit.html another one machine made using HT-8950
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jjj



Joined: Feb 28, 2008
Posts: 129
Location: Chile
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PostPosted: Fri Oct 02, 2015 5:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

Big question:
Can its vibrato be adjusted as to provide a slow frequency shift (of max. 5%) and thus, be useful as a how-round stabilizer to eliminate Mic feedback problems in audio setups?
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