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 Forum index » DIY Hardware and Software » Circuit Bending
casiotone 401
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mimsey



Joined: Apr 04, 2009
Posts: 13
Location: Los Angeles

PostPosted: Wed Jul 01, 2009 7:26 am    Post subject: casiotone 401 Reply with quote  Mark this post and the followings unread

Anyone have any info / schematics on the chips and layout? I've got one and swapped the tuning pitch resistor so I could mount it on the top, but I want to modify more, I just don't want to break it. I see a few vari-resistor on the main pcb, I'm looking for a schematic so I can find out what these are for. I found this which is a great resource, but I'd like to dig deeper.

http://weltenschule.de/TableHooters/Casiotone_401.html

Thanks!
aj
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Lofi Ninja



Joined: Oct 25, 2008
Posts: 143
Location: Jupiter

PostPosted: Wed Jul 01, 2009 1:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Oceanus have modified one. It's on utube. Very nice piece of gear ! I just found a Casiotone 701 in the trash today ! It just need some refurbishment..
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mimsey



Joined: Apr 04, 2009
Posts: 13
Location: Los Angeles

PostPosted: Wed Jul 01, 2009 2:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

nice find on the 701! I got my 401 on ebay for $20 a while back, one of my best deals to date.

Yeah that guy Oceanus is a wizard. I'll have to look for it.

thanks
Aj
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Lofi Ninja



Joined: Oct 25, 2008
Posts: 143
Location: Jupiter

PostPosted: Thu Jul 02, 2009 2:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's a pic of it.. It's in a pretty decent shape !

http://farm3.static.flickr.com/2470/3681946575_ef920a0fae.jpg?v=0

My Flickr photostream

http://www.flickr.com/photos/lofininja/

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reve



Joined: Feb 23, 2008
Posts: 149
Location: USA

PostPosted: Sun Jul 12, 2009 9:50 am    Post subject: Re: casiotone 401 Reply with quote  Mark this post and the followings unread

mimsey wrote:
Anyone have any info / schematics on the chips and layout?


Hi Mimsey. I have the 403, which judging from the pictures is extraordinarily similar. I've poked around and while I've seen stories of people who've done mods, I haven't found anything genuinely useful on doing my own -- so if you find anything, please post it here.

On the 403, the trim pots on the main PCB adjust the decay time time of the ringing oscillators on the analog drums. So these would be worth bringing out to front panel controls, particularly if you could figure out which components control the PITCH of the drum oscillators. IIRC, the right hand third-to-half of the right hand side is pretty much drums.

I've located viable trigger ins for drums if you're interested in triggering them externally, but wasn't planning on doing anything until I'd figured out what controlled the drum pitches.

I couldn't find any bends to significantly affect the timbre of the synth section beyond some boring distortion. Because of the organ-like voice architecture, I don't really think I will. :/
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abelovesfun



Joined: Dec 17, 2012
Posts: 40
Location: Portland, OR

PostPosted: Thu Sep 26, 2013 6:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

I would love info on adding triggers in and individual outs - i think these drum sounds are awesome.
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