The Thomas Henry Mega Percussive Synthesizer

[Floppy]

until the wiring i just used the BOM to build the MPS.
now i have no clue how to proceed with all the J´s.
is there a manual where the wiring is explained ?

[kkissinger]

Note that pin #1 is denoted with a square pad.


J11

1) +V
2) Gnd
3) Gnd
4) -V

J12

1) -V
2) Gnd
3) +V

J13

1) unusued
2) R84 Top

J14

1) Impact Send
2) R97 Center
3) R96 Center
4) R38 Top
5) R95 Center
6) R37 Top
7) LP/BP switch - Pole
Noise Send

J15

1) R80 Center
2) R80 Top
3) LED - Cathode
4) LED - Anode
5) R38 Center
6) R84 Center
7) R39 Center
R85 Center

J16

1) R83 Top
2) Shell Send
3) R81 Bot
4) R81 Center
5) LP/BP switch -- BP
6) R78 Top
7) R78 Center
R78 Bot

J17

1) R82 Bot
2) R82 Center
3) R40 Center
4) R41 Center
5) R42 Center
6) R43 Top
7) (Snth?? -- not sure, not using it)
R83 Center

J18

1) R36 Bot
2) R36 Top
3) R36 Center
4) Trigger In
5) R79 Bot
6) R37 Center
7) R79 Center
R39 Top

J19

1) +V
2) Gnd

J20

1) Gnd
2) Gnd

J21 (not on my board but may be...)

1) Opt Noise CV
2) Opt impact CV

R78, R79, and R81 do not connect to ground instead they connect to V+

R80 and R84 do not connect to ground -- they connect to V-.

Note that the three decay pots: R95, R96, and R97 only use two pins... the outside pin to ground, and the middle as noted above.

Hope this helps.

[Floppy]

thank you kevin.

[Eraser127]

Maybe a worthless kick but two post above is stated for the potmeter lugs top/center/bottom. I'm into wiring the pots now, but can't figure out which wire onto which potmeter lug. Does top/center/bottom have to do with the orientation of the pots in the schematics (sheet 1 to 4)?

Thanks,

[kkissinger]

The "top" is the leftmost lug when viewed from behind the panel.

[Eraser127]

Ah ok, so the orientation of the pots is all with lugs down and viewed from behind? Or is your list specifically for a certain panel?

[kkissinger]

[jumunius]

Hi, I'm building the MPS right now and am seeking a power supply. I know there was the Power One discussed here, but it is out of stock everywhere (?) and Mouser predicts it won't be shipping until September.

I want a pre-built power supply if possible, as I am somewhat new to DIY (have built PAiA but you don't have to shop for those!). Any suggestions?

Incidentally, I am somewhat wary of Mouser's data, as they claim the Power One HAA15-0.8-AG that people suggested is +/-12v. http://tinyurl.com/2angxtg What gives?

[BananaPlug]

If you Google for HAA15-0.8-AG you'll get the data sheet which explains that this supply may be wired for +/-12V or +/-15V.

[jumunius]

[BananaPlug]

Having that choice makes it kind of the perfect option for modulars. Covers all the formats.

[jumunius]

Oh rub it in, why don't you! 15v or not, nobody lists any as ready to ship.

[BananaPlug]

There's some promising offers on ebay. Just put HAA15 in the search box.

[jumunius]

Thank you! I don't remember what my search criteria was, but I came up wildly different results.

[Eraser127]

I've made the power-supply from this site on a piece of pcb with "3-hole" strips. I just changed the 7812 and 7912 for the 7815 and 7915. It works excellent I get a nice +15V, GND and -15V.

Here's my drawing of the print (every "thick" pencil square is 3 3-hole strips stacked)

On the left side you connect the AC adapter and on the right side you have the +, _ and GND output

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[Eraser127]

I assume all the V+, V-/GND to the potmeters can be wired thru from one point of the pcb? I'm into wiring now, what a job

I also found a fault in the kkissinger scheme:

it says:

J18

1) R36 Bot
2) R36 Top
3) R36 Center

But when I look in the schematics I see that the wiper from R36 is connected to switch S1. And the pole from that switch should be connected to J18/3.

Am I correct?

[kkissinger]

Eraser,

I'll have to take a look. There are a few options for wiring and switches and in some cases I just followed the schematic.

Indeed, you can use a single point to connect the +/- voltages and ground from the panel to the PCB.

[Eraser127]

Ah ok, i followed your guide and did the rest thru the schematics, it makes sound now I only wired some pots wrong like rotate cw is off instead of on

[jumunius]

Hi, I am in the home stretch of my MPS board and had to buy one last .01uf ceramic to fill in C8. I accidentally ordered 20% tolerance, and it lead me to wonder what tolerances were acceptable for this projects, and what are acceptable in general. My other .01uf ceramics are 10% tolerance on here -- are those tolerances ok? I don't know how precise this needs to be.

I hope this is ok, because I am so ready to finish this and use the darned thing!

[Col]

Almost finished with my MPS, just need to wire it up.

I have a rev 107 board. Ive gone through the many pages of this thread and found:
mps_connections_v1_133_2_335.pdf
mps_connections_v1_133_877.pdf
mps_layout_111.jpg

It looks like these are for rev 106 boards.

Ive noticed J20 and J21 have been removed on rev 107 (lucky for me, id already done my panel based on the block diagram, so no noise cv)

Are all the other connections the same on rev 107 boards - e.g. can i just wire it up as per one of the pdfs and drop the additional 100kB CV pot and jack?

Oh which of those two pdfs is more recent?

Thanks - C

[oneoff]

this is actually the second version..
the first one was this:


more pictures and info in my blog:
http://noisedesign.blogspot.com/

[Eraser127]

Alright, finished my MPS in a temporary housing :

[img]http://www.synthforum.nl/forums/attachment.php?attachmentid=58155&d=1273059660[/img]

I'm trying to add midi so I found a simple pic project (midi to pulse):

http://chip.aeug.org/midi4_0.asm

The thing is that this is for the PIC16c84. I have the PIC16F84, I converted the .asm with mplab to hex for the 16f84 but it gives a message:

[blue hell]

The messages just mean that you need to check if the bank bits are set up correctly, looking at :

[blue hell]

oops ... the config should be arranged for with

[Danno Gee Ray]

Oneoff, Nice build. Would it be possible to post a full on photo of the faceplate? Just curious how you configured it.

Thanks,

Danno