New Technics SP10 motor controller specification

[Steerpike]

This PCB layout is going slower that I imagined; but it IS going.

[Steerpike]

Its coming along nicely: slowly, but nicely.

A few important criteria for my layout, with a view to keeping it aimed at DIY and lowest possible cost:
single sided board; wide tracks and minimal tracks-between-IC-pads for easy etching, wide component spacing to allow substitute components of varying size, no surace-mount components.

This is a protoype board, so it contains component positions for all possible theoretical circuit arrangements. For instance, the op-amps can be configured as inverting, or non-inverting, by adding specific resistors and omitting others; filters can be 1st order, or 2nd order, depending on resistors & caps added, and so on.

If the board works OK, I will NOT redo the major layout to minimise size, or hole-count / component-position-count. Minor fixups, yes, but the board will remain like this so future experimentation and modifications can be tried.

[Brett]

Originally Posted by Steerpike

Its coming along nicely: slowly, but nicely.

A few important criteria for my layout, with a view to keeping it aimed at DIY and lowest possible cost:
single sided board; wide tracks and minimal tracks-between-IC-pads for easy etching, wide component spacing to allow substitute components of varying size, no surace-mount components.

This is a protoype board, so it contains component positions for all possible theoretical circuit arrangements. For instance, the op-amps can be configured as inverting, or non-inverting, by adding specific resistors and omitting others; filters can be 1st order, or 2nd order, depending on resistors & caps added, and so on.

If the board works OK, I will NOT redo the major layout to minimise size, or hole-count / component-position-count. Minor fixups, yes, but the board will remain like this so future experimentation and modifications can be tried.

This all sounds excellent to me. My plan was always to mount it external to the motor unit and a have a spare 19" rack case for it somewhere.

I will be speaking to someone next w/e regarding some CNC cutting of ply to make the plinth for mine, as well as for my 401, similar to Albert Porter's plinth.

[Steerpike]

I've added a page 6 to document the mechanical / physical prototyping - as distinct from the theory.

[rich121]

Been "away" for awhile... my home is "gutted" doing a complete remodel..replacing wiring, plumbing, sheetrock, flooring..and even changing room layouts.

Things are really looking good and looks like Steerpike has been quite busy...which is very very much appreciated!

Again, thanks for the effort! I will keep watching as this progresses...


Great Job!!!



Rick

[Steerpike]

I took a break from the controller and did the copper layout for the power supply board here: psu pcb.

This is 8.1" x 3.9" to fit exactly into the box I showed a few posts back. No doubt your favourite component supplier will have all manner of instrument housings in all kinds of styles, if you choose to use the board layout exatly as I have shown it. (it may have a few mistakes in it still, so don't copy & etch it just yet!)
The five TO-220-package regulators are all in a row - these are to be bolted onto an L-shaped aluminium flange to act as a heatsink.

Note that this power supply is NOT a drop-in replacement for the original SP10 with its factory electronics. It doesn't have the appropriate grounding system - although it could be modified to be compatible with the original.

[ckniker]

I took a break from the controller and did the copper layout for the power supply board here: psu pcb.

That's a very clean layout! If you don't mind me asking, what layout software are you using ?

I've been playing around with a couple of the free-bies (Eagle and 4pcb) and have had to do a huge amount of hand routing due to the difficulties of doing single layer boards with those tools.

[Steerpike]

Originally Posted by ckniker

That's a very clean layout! If you don't mind me asking, what layout software are you using ?

Tango PCB. By software fashion trends, it's ancient. But nothing newer (in the affordable categories) has impressed me at all.

I'll modify that board a little (a mark 2 version) that doesn't include the transformer on the PC-board, for people who want to use a more generic transformer and housing. Basically, that would amount to chopping off the left-hand half of the board.

[Steerpike]

Originally Posted by Steerpike

I'll modify that board a little (a mark 2 version) that doesn't include the transformer on the PC-board, for people who want to use a more generic transformer and housing.

Like a prophecy coming true....CLICK!

[Maxwell]

Hi
I just wanted to say that I will definitely be interested in whatever you produce - pcb, kit, whatever.
I have a motor with no controller, so this will be perfect for me
Really enjoying following this thread :-)