Maplin voice changer kit

LektroiD · Posted: Mon Oct 13, 2008 9:37 am Post subject: Maplin voice changer kit

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.

EdisonRex · Posted: Wed Oct 15, 2008 2:47 am Post subject:

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).

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

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

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

and one more ht-8950 based project

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

fluxmonkey · Joined: Jun 24, 2005 Posts: 708 Location: cleve

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

synthmonger · Posted: Thu Dec 11, 2008 1:49 pm Post subject:

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.

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

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

jjj · Posted: Fri Oct 02, 2015 5:07 pm Post subject:

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?