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 Forum index » DIY Hardware and Software » Thomas Henry designs
The Thomas Henry Mega Percussive Synthesizer
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01012k7



Joined: Aug 31, 2013
Posts: 18
Location: England

PostPosted: Thu Apr 10, 2014 1:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Decided to build another MPS after some one giving me a board so its going into my euro rack so far here a few pictures


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P.S Installing a second power supply 15- ov 15+ for mps, Oakley little LFO,ETC
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jpjsenior



Joined: Jan 04, 2014
Posts: 3
Location: Bristol, UK

PostPosted: Thu Apr 17, 2014 3:30 pm    Post subject: Additional power inputs question
Subject description: MPS J12 and 19 unsure how to wire
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Hi there,

I'm about to embark on building a couple of these and I have a question about something I've not come across before that is a bit basic I think, but as it's concerned with something on the MPS boards I thought I would post it here.
Back on page 24 of this thread kkissinger has kindly made a list of the wiring on the board. It shows J11 as where the main power comes in from the power supply. J12 and J19 also are listed as bringing + and - V in. I'm unsure how this works. From looking briefly over the schematics I'm assuming these additional voltages would be 15v. Am I right in thinking that? Would there need to be separate connections from the PSU for these? Or are they something else and if so can anyone guide me towards some info on how to get everything set up power-wise? I have a +/-15V PSU with a distribution board assembled ready for this project. This issue is the only thing stopping me getting on with the soldering at present so any help would be much appreciated,

Thanks,
Jon
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elmegil



Joined: Mar 20, 2012
Posts: 1445
Location: Chicago
Audio files: 14

PostPosted: Thu Apr 17, 2014 4:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

J11 is power in

J12 is power out to the various pots that need it.

Not sure what 19 was for, mine is in the basement and not convenient at the moment; I could check it out later if you need.
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jpjsenior



Joined: Jan 04, 2014
Posts: 3
Location: Bristol, UK

PostPosted: Fri Apr 18, 2014 8:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks man, that makes sense. Gonna spend a bit of time studying the schematic against the boards I reckon before getting started.
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qfactor



Joined: Jul 19, 2010
Posts: 5
Location: Singapore

PostPosted: Sat May 31, 2014 8:39 am    Post subject: Reply with quote  Mark this post and the followings unread

elmegil wrote:
J11 is power in

J12 is power out to the various pots that need it.

Not sure what 19 was for, mine is in the basement and not convenient at the moment; I could check it out later if you need.


I believe if you have version 107 PCB, there is no more J19,20 and 21, right?
So there's no need to hook those up.
My question is Similar to defog's on the use of +-12V instead of 15v. Do I need to change any resistor/cap values for this, or can I go ahead with everything unchanged?

Thankie!
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01012k7



Joined: Aug 31, 2013
Posts: 18
Location: England

PostPosted: Sat Jun 14, 2014 1:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

I would like to take full credit for this project but I cannot my friend wired the thing up and got it working I did make the front panel and drill the holes and solder the parts on the board with I guess some errors Smile


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