DIY 4ms SMR

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dalhasumai
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Post by dalhasumai » Wed Mar 23, 2016 4:51 pm


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dalhasumai
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Post by dalhasumai » Wed Mar 23, 2016 4:56 pm

Apparently those pots should be good cheap replacement for the trimmers (also good for many mutable builds) http://fr.aliexpress.com/store/product/ ... 28063.html

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Post by Dogma » Thu Mar 24, 2016 7:46 am

that looks like a reflow oven job...is that what most people are doing?
look up!

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dalhasumai
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Post by dalhasumai » Thu Mar 24, 2016 9:16 am

I'm only using my iron and some flux at the moment on some mutable builds

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d.simon
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Post by d.simon » Thu Mar 24, 2016 9:34 am

Dogma wrote:that looks like a reflow oven job...is that what most people are doing?
I haven't gotten into reflow ovens yet. I'm thinking of getting a hot air station. My friend has a special dispenser for (flux?) or maybe solder. (instead of using a stencil).

with hot air station, I think you don't have to place all the parts. not so sure on ovens?

also I'm pretty sure I'm going to need hotair at some point for any rework.

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d.simon
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Post by d.simon » Thu Mar 24, 2016 9:51 am

another thing I'd like to get is some soldering tweezers.
but at the same time I'm trying to avoid buying too much equipment

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dalhasumai
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Post by dalhasumai » Wed Apr 13, 2016 8:53 am

someone shared an in-progress mouser cart :
https://www.mouser.fr/ProjectManager/Pr ... 0a9e03c5ea

missing :
* jacks
* pots
* mom switches
* submini spdt
* rotary encoder

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HipDestroyer
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Post by HipDestroyer » Wed Apr 13, 2016 9:01 am

deleted.
Last edited by HipDestroyer on Fri Apr 15, 2016 2:46 pm, edited 1 time in total.

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dalhasumai
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Post by dalhasumai » Wed Apr 13, 2016 9:39 am

yes, thanks :)

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HipDestroyer
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Post by HipDestroyer » Wed Apr 13, 2016 11:16 am

Does anyone know what the deal is with the spdt mini switch??? The Eagle BOM says:

SLOWFAST-SW submini-3T SPDTT SPDT-SUB SPDT Switch


:hmm:

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HipDestroyer
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Post by HipDestroyer » Wed Apr 13, 2016 11:55 am

I changed the stm to STM32F427ZGT6 in the cart

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Post by webboy » Wed Apr 13, 2016 3:03 pm

I'm damn near positive the "official" SMR toggle switches are E-switch 200 series. I don't know *exactly* which ones, but the MSP-1 (on-none-on) and MSP-3 (on-off-on) look like the right models. The red plastic bodies look identical to the SMR side photos.

If someone can confirm, or if they want to sort out the exact model from the datasheet, please do!

datasheet - https://www.e-switch.com/system/asset/p ... 31/200.pdf

Photo of SMR switches -

Image

Photo of E-switch 200 series toggle switch (wrong terminations in this pic, they should be solder pins)-

Image

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dalhasumai
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Post by dalhasumai » Wed Apr 13, 2016 3:06 pm

looks good ! :)

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Post by webboy » Wed Apr 13, 2016 3:09 pm

HipDestroyer wrote:Does anyone know what the deal is with the spdt mini switch??? The Eagle BOM says:

SLOWFAST-SW submini-3T SPDTT SPDT-SUB SPDT Switch


:hmm:
Those are the on|on and on|off|on switches marked on the PCB. The submini-2T (x5) and submini-3T (x1) respectively.

SPDT = Single Pole Dual Throw (Toggle)

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Post by webboy » Wed Apr 13, 2016 3:13 pm

dalhasumai wrote:looks good ! :)
I just noticed you can even see the side clip if you look very closely in the shadow of the SMR photo. I'm sure now. ;)

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Post by webboy » Wed Apr 13, 2016 3:15 pm

Jacks are thonkiconns - next.

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Post by webboy » Wed Apr 13, 2016 3:24 pm

Pots are also easy. Song Huei "Tall trimmers" at Thonk. Also from the Thonk product page:
These are direct drop in replacements for the common Alpha 9mm vertical trimmers and metal shafted potentiometers. They are also directly compatible with many other 9mm pot footprints from Bourns, Panasonic and others, see the datasheet for footprint details.

These pots are more ergonomic due to the longer shaft and they are easier to read than the competitive offerings due to the white marker line. These pots also have a 15,000 cycle lifespan compared to the Alpha 9mm pot 10,000 cycle lifespan.
Note also that a BOM generated from the SMR in Eagle says "POT-9MM-SONGHUEI"

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Post by Bamboombaps » Wed Apr 13, 2016 3:30 pm

EDIT: thanks! 8-)
Last edited by Bamboombaps on Wed Apr 13, 2016 3:42 pm, edited 1 time in total.

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Post by webboy » Wed Apr 13, 2016 3:34 pm

So all that is left is the encoder. Only detail the Eagle file provides is that it's "12mm." Given that there are 20 LEDs, I will assume that we need a 20PPR encoder. I'll bet the Bourns PEC11L series is the correct one. I have some PEC11Rs at home, so I will check if the footprint is the same in the PEC11L and if so, I can try to snap in into my PCB. ;) Bourns PEC*11* series are 11mm, but I bet it fits. ;)

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Post by HipDestroyer » Wed Apr 13, 2016 3:41 pm

Great job!!! I'll update the cart tomorrow and we should be set after scrutinizing the whole thing an extra time ;)

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Post by webboy » Wed Apr 13, 2016 3:59 pm

webboy wrote:So all that is left is the encoder. Only detail the Eagle file provides is that it's "12mm." Given that there are 20 LEDs, I will assume that we need a 20PPR encoder. I'll bet the Bourns PEC11L series is the correct one. I have some PEC11Rs at home, so I will check if the footprint is the same in the PEC11L and if so, I can try to snap in into my PCB. ;) Bourns PEC*11* series are 11mm, but I bet it fits. ;)
OK, so the Bourns PEC11 series will fit if you modify the board clips. They are slightly too wide for the holes. Should be easy to compare the Bourns PEC11 footprint from the datasheet to an alternative and find one that fits out of the box. (I recently went through this on another build, so I'm confident it's no big deal.) The clips could just be made to fit somehow, which shouldn't be so difficult, or simply cut off *carefully at board level* and soldered in place. I only say that because some may already have 20PPR + push Bourns encoders which they could easily make use of on an SMR.

Thonkiconns I already knew were correct, but I had one in hand so I just popped it in the PCB to be 101% sure.

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Post by webboy » Wed Apr 13, 2016 4:16 pm

Last one for tonight. The Res (Q) pot (front panel name) marked "QVAL" on the PCB says "Song Huei 9MM" in the Eagle - generated BOM I made, but in Eagle Layout view it has a D-shaped shaft, so note that while the rest of the 4 pots are naked, plastic shafts with markers (the Thonk "tall trimmer" style,) that one is a D-shaft meant to wear a knob. The pots values are another thing to sort, but that info is in the schematic - easy peasy.

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Post by Altitude909 » Wed Apr 13, 2016 6:50 pm

here, I'll make it simple for you guys:



That is what I used for my build

The only issue is the 47 uF parts are the wrong size

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Post by webboy » Thu Apr 14, 2016 1:40 am

Altitude909 wrote:here, I'll make it simple for you guys:



That is what I used for my build

The only issue is the 47 uF parts are the wrong size
Thanks Detroit homie! :bananaguitar:

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dalhasumai
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Post by dalhasumai » Thu Apr 14, 2016 3:36 am

Altitude909
thanks a lot !
and thanks everybody, let's build :)

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