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 on: April 16, 2019, 09:04:06 PM 
Started by Barcode - Last post by kragg
Congratulations for your working build.
I built mine a couple weeks ago, and i'm still working on mods.
My advice would be to take time to tweak and experiment.
Bassdrum Decay is easy.
Rimshot mods are very interactive : changing one value can impact other rimshots mods, so again experiment (i ended up not keeping the decay mod, as along with tuning, it could go into self-oscillation too easily).
Snare decay is easy, too, and quite effective.
I also put several capacitors on a rotary switch, so i can have several hi-hat tune/filter setings, which i like.
I didn't manage to find a nice hi-hat decay mod.

 on: April 16, 2019, 06:20:31 PM 
Started by Barcode - Last post by bodster
Hi people,

First post on here, so apologies in advance for any duplication or repetition on my part.

Has anyone got a definitive list of all the mods for this groovy little machine? I've built a really nice fully-working model, with switched separate outputs and no hum or crackle or anything like that. I also now have a rather smart looking Eurorack front panel for it when finished. I'm currently controlling it very nicely from my Beatstep Pro.

I'm sure I wouldn't be the only person who would really benefit from a good, solid list of mods. If I can get them all to work I might even produce a basic updated version of the 'build manual' schematic for them...

I also have a rather shambolic list of possible mods for it, none of which I am 100% sure about yet... I am relatively new to DIY building so I still have some huge gaps in my basic knowledge, so what may seem simple to you guys might be completely new to me.

Here is the list I've compiled with my basic queries afterwards:

Bass drum decay:
Replace R33 with a 1kb pot and a 500R trimmer

Bass drum pitch:
Replace R31 with a 1mb pot and a 2m trimmer

Snare drum pitch:
Replace R50 with a 1mb pot and 2m trimmer

Rimshot pitch:
Replace R43 with a 1mb pot and 2m trimmer

To all of the above mods I have the same basic question - replace the resistors how? In what order/sequence? Using which pins to which ends of where the resistors where exactly?

I've also seen that some people have made mods for snare drum decay and colour, as well as the possibility of an 'open' hihat trigger...

Has anyone successfully performed these other mods?

Also, one final question. I have got separate outputs working fine, but I am such a newbie to this that I am not really sure even how to go about adding a level control for each sound. I understand that this must be by adding a pot for each sound, but what value should I use?

Sorry for all these questions and please feel free to tel me to f**k off, but the only way I know to learn is by asking others with more knowledge than me!



 on: April 16, 2019, 02:01:54 PM 
Started by Circuitbenders - Last post by kragg
I would be curious to know if anyone managed to add individual volume pots in the end ?
I used a dual gang pot for the hihat (wiring J2 & J4), but i am struggling with the snare (wiring J1 to a pot affects the snare, but also rimshot and hihats, and wiring J4 doesn't give me much results).

 on: April 07, 2019, 08:37:26 PM 
Started by Jonaht - Last post by Jonaht
I had my first go at modding and did the MDK mod on my Korg Poly 800 (mk1) . I was having trouble reloading the sound banks and all the noises that would come out were the same swishy swish noise so decided that there wasn't much to loose on doing the MDK mod and trying to sysex my way to a better place.
So did the track cuts with a dremel  and then soldered on the wires, changed the chip and put it all back together.
Powered up ok. I then went to try and load the midi and set the midi channel on the synth. I then realised that none of the programme setting buttons responded.
It displays programme 1.8, Parameter no 50, value 01 constantly. It also briefly flick ups something that looks like a Y and another character for a millisecond before it displays the error.
I've found a few threads that imply the error is related to the coin battery dying. I have this lithium coin battery mod already and it has been fine for a few years with it. I have change the battery again for a fresh one but its made no difference,
Is it likely I've just not put everything back together quite right or have i like broke something whilst dremeling/soldering?
Any suggestions welcome as I'm not sure where to start of f this is recoverable.
May thanks

 on: April 03, 2019, 12:41:26 AM 
Started by Caravandal - Last post by Caravandal

 on: March 23, 2019, 10:28:49 AM 
Started by Invalid - Last post by Invalid
I tried the search but did not find what I needed.
I am looking for information on modifying a Fostex de 1 effects unit, like the one found on the home page.
My big question is, can the small green pcb be lifted off the brown main pcb for access to the underside?

If anyone has a link to information, or experience, your help would be appreciated.


 on: March 19, 2019, 08:29:09 PM 
Started by RabGee686 - Last post by RabGee686
Hi, I'm having difficulty finding replacement slide potentiometers (volume & select) for the Alesis HR-16 drum machine. I've seen vastly overpriced replacements show up occasionally, so i thought i'd contact the U.K. company 'Mouser Electronics' as they seem to carry a huge amount of stock. I send photos with measurements and a copy of the service manual. This was the reply :
5:57 PM (2 hours ago)
to me
Good Afternoon,
Thank you for this enquiry, with the information that has been given we are unable to provide a full match, with potentiometers we would need a few key specifications that aren't given below, the power, voltage, tolerance etc.

If anyone knows the full specs ;    Resistance   Power Rating, Voltage Rating,Tolerance, Taper, Length   Width, Height this would be Extremely helpful ! Thanks.


 on: March 18, 2019, 09:11:04 PM 
Started by gmeredith - Last post by gmeredith
Thanks for the heads up, Paul, I was considering getting some.

Cheers, Graham

 on: March 18, 2019, 01:18:46 PM 
Started by gmeredith - Last post by Circuitbenders
For everyone looking for UMR2. Check for it. I bought 5 of them for my 2 sk60's, Philips PMC100, Yamaha VS200 and for.... I'll find something :)

We've had people send these in with kit they want them fitted too, and on at least 3 or 4 we've had problems that meant the same note on every octave wouldn't respond, or similar issues. This always seems to be down to bad SMD soldering on the PIC chip.
Once you reflow the joints they work fine, but its something to consider if you have any problems.

 on: March 18, 2019, 01:10:34 PM 
Started by johnny_dub - Last post by Circuitbenders
Are you sure you eliminated every positive power rail pin? If i recall correctly theres more than one.

Unless you have an unstable HR16, you should be able to use almost every patchbay point simultaneously before it crashes!
I have a vague recollection of similar behaviour on an HR16 i had a while back that had suspect leaky filter caps up by the the power input

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