STM PSU pricing poll

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Price would pay

£50-£100
11
85%
£100-£150
2
15%
£150-£200
0
No votes
£200+
0
No votes
 
Total votes: 13

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exxos
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STM PSU pricing poll

Postby exxos » Sat May 20, 2017 11:34 am

I had a idea to build a STM PSU. External, black aluminium box. Connectors for ST and 2 floppy drive, possible a aux to power ultrasatan etc.

Reason for the poll, is while the PCB itself is very time consuming to assemble, "metal work" plus various drilling wiring etc is also very time consuming.

I don't know if there would be interest in such a PSU, if there is, I need to have a idea on what people would pay as it would determine if its viable to buil them or not. Of course extra parts ramps the cost up a lot as well even without additional assembly work.
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Re: STM PSU pricing poll

Postby mzry » Sat May 20, 2017 3:07 pm

STM? What the jeebus is that exactly?
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Re: STM PSU pricing poll

Postby exxos » Sat May 20, 2017 4:45 pm

mzry wrote:STM? What the jeebus is that exactly?


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Re: STM PSU pricing poll

Postby itaboy » Sat May 20, 2017 4:55 pm

I would be interested, As for the price, what can I say... I am not an expert, but something int he order 50-70 euros would be fine

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Re: STM PSU pricing poll

Postby exxos » Mon May 22, 2017 8:48 am

itaboy wrote:I would be interested, As for the price, what can I say... I am not an expert, but something in the order 50-70 euros would be fine


Thats about the price the "PCB" is selling for currently. So with the case, extra connectors, wiring, drilling etc the price would likely be over £100 easily. I estimate depending on price of getting cables made, possible fabrication of the cases also, the price would be more around £130+. Looking at the poll so far, I can understand people don't want to pay more than £100 for it (I probably wouldn't myself) but its unlikely to be possible to build them for that price.

The only option would be to just go with a basic transformer and regulator like the original, would get hot of course, but would reduce costs. Though people don't really need me to wire up a 7805 to a transformer and put it all in a box. In which case probably just not worth doing when that is what the original is ( I think ?) .
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Re: STM PSU pricing poll

Postby Nimrod » Mon May 22, 2017 10:55 am

If you have a STM with 2 drives you have 3 separate power supplies + long cables. Getting rid of that is worth something.
AUX = +5v/2A USB plug? I would do 2x of these.

50-75 is a bargain.
75-100 is still fairly easy to sell.
100-125 is sounds expensive but if it looks good I would buy it.
+125 ... get another ST model? I would pay 125... 150 not so sure.

The ST(M) are probably not as popular as the STFM's and STE's so maybe the "market" is not big enough?
A new power supply would make this setup a bit more portable and convenient.

How about an external PSU that could also be used with STFM/STE with a extra power cord that connects to the STFM power in the MB?
Or even more simple. Retrofit a STM power plug to the STFM/STE case that connects to the motherboard.

Size of brick: Same height as STM and external floppy if possible.

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Re: STM PSU pricing poll

Postby exxos » Mon May 22, 2017 7:06 pm

There seems to be a lot of STM's about oddly. I already do lots of PSU options for the STFM's & STE, and Falcons anyway.

The PSU box would be pretty small actually. Not even sure if all the connectors would fit until its tried. Though I have to re-design my PSU board (again) as the cases are 1cm shorter than the STF/E's PSU :(
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Re: STM PSU pricing poll

Postby spiny » Tue May 23, 2017 10:50 am

would it be possible to offer a psu with all the outputs (STM, floppys, 12v for US maybe 5v for Unicorn etc) but unboxed ? As in just solder headers for the power, for end users to make their own cables / cases? Or does this open you up to the less skilled solder types breaking stuff then moaning ?

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Re: STM PSU pricing poll

Postby exxos » Tue May 23, 2017 10:59 am

spiny wrote:would it be possible to offer a psu with all the outputs (STM, floppys, 12v for US maybe 5v for Unicorn etc) but unboxed ? As in just solder headers for the power, for end users to make their own cables / cases? Or does this open you up to the less skilled solder types breaking stuff then moaning ?


People could do that already with the PSU board I already sell.

I did bulk but the cable sockets (maybe plugs cant remember) to make the cables ages ago so they could be sold separately.


This is the case I got.

IMG_1538.JPG
IMG_1537.JPG


Basically has PCB slots to hold the PCB in place (but 1cm to short for the current PCB :( ) The top comes off so I can drill and fix the regulators to the case, also fit feet to the bottom. The mains "hole" is pre-cut. The end panel would hold the ST side connectors (if they would all fit).

Of course "fabrication" of the case, plus all the connector wiring, cable wiring thats where all the time goes. Could be supplied as a kit, though probably 90% of people would manage to mess it up :roll:
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Re: STM PSU pricing poll

Postby Kubik » Tue May 23, 2017 11:18 am

One way to keep the price down would be to use standard PSU and just desing a case and cabling around it. If I paid something for Atari PSU, it would be for the look and feel, not the innards. Meanwell PSUs are pretty good and very reasonably priced - their 66W one (5V/12V) costs around twenty quids. I also assume those are CE certified. They also allow adjusting the 5V output voltage so you can compensate the cable losses.
(Just an example, I am sure there are many good quality PSUs around there, not just MeanWell).

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Re: STM PSU pricing poll

Postby exxos » Tue May 23, 2017 11:37 am

Kubik wrote:One way to keep the price down would be to use standard PSU and just desing a case and cabling around it. If I paid something for Atari PSU, it would be for the look and feel, not the innards. Meanwell PSUs are pretty good and very reasonably priced - their 66W one (5V/12V) costs around twenty quids. I also assume those are CE certified. They also allow adjusting the 5V output voltage so you can compensate the cable losses.
(Just an example, I am sure there are many good quality PSUs around there, not just MeanWell).


Yeah, I could go with a off the shelf PSU. But I'd rather build stuff myself and know its works properly. Even so, people could do that themselves anyway.
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Re: STM PSU pricing poll

Postby mlynn1974 » Tue May 23, 2017 11:48 am

I'm not an electrical engineer but surely it is safer to use plastic than metal for PSU cases.

With metal I would think there is always a danger of the case becoming live. The C64 epoxy filled PSUs were horrible and unservicable.
The A1200 PSUs looked good, were light weight and seemed to be perfectly servicable.

I think a good design would be plastic, double insulated with ventilation grills on the top. The grill should not be big enough to let dust or other contaminants in though. There is probably a regulation about this. The A500 Plus (not the old brick style)\A1200 stock PSU design seemed quite safe and reliable.
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Re: STM PSU pricing poll

Postby spiny » Tue May 23, 2017 12:45 pm

exxos wrote:
People could do that already with the PSU board I already sell.

I did bulk but the cable sockets (maybe plugs cant remember) to make the cables ages ago so they could be sold separately.



i'll take a closer look at the one I got from you :D

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Re: STM PSU pricing poll

Postby Kubik » Tue May 23, 2017 1:16 pm

exxos wrote:Yeah, I could go with a off the shelf PSU. But I'd rather build stuff myself and know its works properly. Even so, people could do that themselves anyway.

I fully understand that, I am like that myself :) However, such a kit using off the shelf PSU might be interesting for different class of customers. And sorry for stealing your thread :)


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