The Thomas Henry Mega Percussive Synthesizer

[Uncle Krunkus]

I felt like I should have responded with a resounding "yes it is" (seeing as how I laid it out! )
But the fact was that I double guess myself so much that I quickly convinced myself that I just wasn't as sure as I thought I was!

[Funky40]

I'm very confused about the shell CV in and the optional CV ins ( impact/ Noise )

my shell CV in is definitly not working.
looking to Bugs wiring table it looks now to me as the switch should be a on-on-on and not on-on as i have.


I also messed up my panel while building the module because i added a CV input for the noise,
but then there was no J21 connector on the board....
buit now i remember that there was some disscussion somewhere back in this thread, and CV for noise and impact was omitted,
but then again i don't understand the lettering of the switch.
Is this switch thought to change the destination where that CV input goes to ?
i'm confused



the module sounds great, just wish to have a second one.
another faceplate is donne, another board too, but i have no connectors.......forgot to order those, shit ( must take them now over musikding )


thanks to Thomas, uncle K, Bugs and all the others involved in this project !

[Uncle Krunkus]

There is only one CV in on the final board.
However, the "CV Source" or "shell modulation type" switch, lets you send the impact or noise signal into the CV summer for the shell. It's normaled to the Shell CV input jack.

[Funky40]

so i indeed need just a single pole switch and i just have to connect the center of the switch to the switch of the jack ?

[Uncle Krunkus]

Yep

[Funky40]

switch is replaced/rewired.
thanks


i had bleedthru from the impact to the noise mix when i tested the module.
now, placed in the sYnth i hear nothing. works again fine

only thing what is not running is the impact to CV shell modulation.
noise is working as modulation.
Have to check that wire......
great, happy that this 18 Pot module is running.

[Thomas_Henry]

Hi gang,

It's been ages since I posted. Due to various impedimenta, I wasn't able to broadcast a lot of new stuff this summer as in the old days. (Five new projects never made it beyond North Mankato). So not to spin my wheels, I went back to finish up some old projects.

I finally concluded my permanent MPS unit. Here's a pic of the unit. It's the top module in my new cabinet.

It's been a couple years since I heard it on the breadboard. Wow (if I do say myself)! The noise source and filter are pretty ordinary, but the impact tone generator and ring modulator really blew/blow me away. I can sense a new song on...

Thomas Henry

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[mosc]

Welcome back, TH. Great to have you here. Hope to hear that new song that coming on...

[droffset]

Hi Thomas, good to see you.

I purchased the electronic drum cookbook and am about to embark on a MPS build(or four), thanks for releasing this stuff, lots of possibilities to play with.

[rudypoochris]

Where are you all ordering reasonably priced potentiometers and corresponding knobs from (P/N's appreciated if available)? Thanks! =]

I just can't seem to figure out which knobs have "D-Hole" shafts and which don't.

[Funky40]

My MPS Eurorack panel.
messed it up with that additional Noise CV socket

thanks again, i like it !


for best adjustments i suggest to use "something" Multiturn. Trimmers for example instead of pots.
Especially for those who like to build several units.
Shell Pitch and RM pitch have lots of sounds within very small amounts of turning the Knob. ( Or the expensvie multiturns )
also Impact pitch could be donne multiturn, but not really important.

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[dnigrin]

I'm considering building an MPS as a tabletop unit, as a standalone synth. I can get triggers/CVs to it from my other gear, but I'll need a power supply. I saw the previous post from Uncle Krunkus about using a Power One supply, but it seems those are ~$50 which is too expensive for me.

Could someone recommend a good power supply design that I could find online that would give me the +/- 15V necessary to power the MPS?

Thanks...

[creatorlars]

[dnigrin]

Excellent, thanks!

[hobgob_inc]

Hey yall

Just looking for some feed back on my panel design for the MPS. Thanks to all others who have posted theirs as inspiration.

I'm building two of these probably on blue anodize in a nice wooden casing. The size of the holes is actually representing the size of knobs, jacks etc. to give me an idea of the spacing, not the actual size of holes.

The main thing i've considered changing is dropping the send/receives. Any feedback would be great


Thanks, Luke[/img]

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[hobgob_inc]

Not sure how to have the image showing on the page....

[rudypoochris]

I am trying to figure out what the 1/4" jacks (J1-J10) connect to on the PCB? Any help would be much appreciated, sorry if this is a silly question, this is my first build. =]

http://electro-music.com/forum/phpbb-files/mps_layout_111.jpg

Additionally, are the NC jacks 2 conductor/3 contact like this:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=SC1089-ND

Thanks!

[rudypoochris]

Eeek got another question, what is the difference between all the different grounds? There is an A-Gnd a D-Gnd and a P-Gnd on the board. Can these all be tied together? If not is A-Gnd AC ground and D Gnd DC ground? If that is so, does the unit have to be grounded to the AC wall outlet? Thanks for any support.

[creatorlars]

A-Gnd is analogue ground, D-Gnd is digital ground and P-Gnd is panel ground (wire to jack sleeves). I can't comment on the details of the wiring, but my guess is they are probably all connected on the board already at certain points.

[Uncle Krunkus]

Yes,
AGnd and DGnd are for systems which have separate Analogue and Digital ground run from their power supplies, so if you have only one ground from your PSU, just run it to the AGnd connection and leave J20 just as it is. (separate grounds need the link under J20 to be cut)
PGnd is just a termination I included for the wire which delivers ground to your front Panel.

[rudypoochris]

Ah okay got it, so leave J20 unsoldered since AGnd and DGnd will be joined?

Thanks for the assistance!

[hobgob_inc]

Thanks for doing that statemachine....

now anyone got any feedback for the MPS above??

Luke

[janvanvolt]

creatorlars: are you able to provide a 1:1 mask for the MOTM design or even able to provide a panel ?

[creatorlars]

Sure, attached is a 1:1 PDF for printing directly to transparency film.

The holes are spaced .875" apart horizontally and 1" apart vertically.

Unfortunately unless I have the panel here and ready to print when I'm doing mine, it's very impractical for me to do additional panels since it requires remaking the screen, etc. So I'm unable to provide a panel. ID Mark photosensitive aluminum may be a good option if you don't want to silkscreen.

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[janvanvolt]

Thanks! Can you outline where holes need to be made ? I'm still guessing on some of those..