Circuitbenders Forum

Please login or register.

Login with username, password and session length
Advanced search  


Pages: [1] 2 3 ... 10
 on: May 10, 2021, 08:36:18 AM 
Started by jamiewoody - Last post by wax+wire
a lot of graham's mods can be found here:

Generally they work on an SK1, but may need a little tweaking.

I've done the SLOW AD mod, Phat Filter mod, Memory Expansion, as well as the patch bay mods.

Also, I recommend trying capacitors/diodes/transistors/relays in your patchbay for more interesting bends.

 on: May 10, 2021, 08:32:01 AM 
Started by gmeredith - Last post by wax+wire
PCBs for the memory expander or the Phat Philterbank.

The answer to both is no. Sorry.

I was just down at the state library in my city. It has a fabrication lab (3D Printers, Lasercutter etc). Anyway, I was really impressed by how easy SMD soldering looked using a hot air gun.

If you are interested in doing up some PCBs I'm happy to help. I'd recommend using SMD and making them fit easily inside the casio.

 on: May 08, 2021, 02:01:22 AM 
Started by Circuitbenders - Last post by belzrebuth
Reviving this thread once again.
New user; first post and seeking for help with my MB33 II.
I have a strange issue with main OUT volume dropping as soon as I turn the distortion pot CW.
The volume drops a LOT as soon as I engage the pot and then goes to zero about 1/3 of the distortion pot's travel.
As I understand from the schematic there's some passive current mixing going on before the signal hits the main OUT opamp which seems like it's only a I-V converter from the sumed current  leaving the OTAs.
So far do good but I don't see any good enough reason for the volume to rapidly drop as soon as the pot is turned.
I get just a little bit of distortion before the signal vanishes.
I have a hunch that it's probably a DC bias issue at play which manages to collapse the whole 13700 but I could be wrong of course.
I haven't actually had a proper look on the circuit but thought to post here in case anyone might have any suggestions.
Possibly help others as well..

 on: May 05, 2021, 08:36:21 PM 
Started by jamiewoody - Last post by Critical Vibrations
in the interest of posterity, and since Yahoo doesn't care about posterity.....if anyone has the information from the now-defunct Yahoo group mentioned in this thread, would you consider posting it here? (or somewhere) thank you, all!!  :D

 on: April 21, 2021, 12:44:14 PM 
Started by gamahachaa - Last post by gamahachaa
Hi All,

I am new to circuit-bending.
I have an MR-16 and want to start to mod it,
I found this post
that shows what could be done.
Before starting and try (not to fuck it up) would any of you guys share some insights ?


 on: April 13, 2021, 04:25:30 PM 
Started by Bugish4567 - Last post by Bugish4567
Has anyone installed individual outputs to a Tascam portastudio? I have a couple models and Iím seeking help.

The models I have are the 488, 488 mkII, and the 414 mkII.

Schematics for all three can be found here:

Thanks for any help!

 on: April 06, 2021, 07:23:47 PM 
Started by elkcloner - Last post by elkcloner
Replying to my own post.  Bad crimp job on a cable was giving not so great (tm) power to the LTC.

Working like a champ now.  I'll post some info about my project once it is done.  The 4066 chip w/ the ROM bends is pure awesome when using with a modular synth.

 on: March 30, 2021, 06:58:43 PM 
Started by elkcloner - Last post by elkcloner
I'm having difficulty taming this combo.  I've cut the trace on the board (and pinned it out).  I'm getting 5V from the rectifier to the LTC and hooking the LTC up as described on the site and as I have in the past for other machines (like my Yamaha RX-5, which works a treat).

But this thing just won't cooperate.  I've tried all kinds of different pots and values, shorting B/C, etc.  Everything is super low pitch and it varies as time goes buy, and by a lot.  It's almost the same kinda behavior you get when a capacitor is charging up.  I'll get a low pitched sound, and then over a little bit of time it becomes unresponsive.  The only time I get something sorta resembling normal sounds is with NO resistance attached to the pot inputs and A/B/C not shorted at all.  It's just a little lower pitched than normal in this case, but it also fluctuates (although I'd kinda expect this, as maybe the pot inputs are floating, or is the trimmer in series?).

I've also tried 2 different LTCs and the exact same behavior, so it's most likely something I'm doing wrong, and probably pretty simple that I'm overlooking.

Anyone else using these in an HR16?

Any tips would be greatly appreciated.  This thing is almost done, I have all 3 chips broken out to sockets, a 4066 for CV control of the bends, a vactrol, all kinds of goodies.  But the part I thought would be easiest is proving difficult.    :'(

Here's a pic (I get an error w/ attachments, something about can't find attachment path)

 on: March 22, 2021, 10:39:48 PM 
Started by Able_Archer83 - Last post by samorave
any news on where do we patch in with those LTC1799s ?? :0

 on: March 20, 2021, 11:59:06 AM 
Started by lagoogy - Last post by lagoogy
Hi all, I wonder if anyone who knows about electronics can give a clue as to what could be wrong with my MD16R drum machine?

The display is not lit up and only displays a series of black blocks. It has had a new screen placed inside it, but the black blocks still display.
The drum machine plays sounds etc, and I cannot see any battery leakage(had a new battery put in).

Any help would be greatly appreciated.

Pages: [1] 2 3 ... 10