Flexinoodle

Sammich UK PSU

19 posts in this topic

Anybody know of a good supplier ?

Everything I am looking at is switchmode or EU plug.

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Its pretty dead on this forum nowadays uh :(

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Here is a discussion with a similar question:

so, from that thread, this here:

http://www.buythis.co.uk/product/4927/genie-psu500-in-line-12v-dc-500ma-regulated-linear-power-supply

might still work?

You are probably fine with a high quality modern switching PSU as well, as long as the switching frequency is well above the audible range, especially as the SIDs are a bit noisy by themselves :). 

Best regards,
Peter

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Tried a regulated switching supply, looks like it burnt out my backlight as per a ton of threads on here, but I dont think Wilba is around anymore to contact is he.

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Hahahah shipping on that is nearly twice the cost of the PSU :)

 

I think i probably need to get a new screen too, OLEDs working on sammich yet ?

Edited by Flexinoodle

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On 03/12/2019 at 4:47 AM, Flexinoodle said:

Its pretty dead on this forum nowadays uh :(

Hey flex, nice to see you back around again, long time!!!   yep I am finding it kinda wierd, its far too quiet and theres no-one in chat anymore.  I know we have all aged slightly and have families and work etc.. but damn.. my local morgue has more movement than this place these days lol!!!

Edited by ssp

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IRC is dead, thats why the chat is dead, Im gonna set up a discord in a bit, it is sad to see this place like this.

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How can i test if that power supply is linear and regulated ?

They sent one, but it isnt the one in the image and it is pretty small too.

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If the PSU is heavy, then it has a wound transformer in it, so it is a linear PSU. If it is light, then it is switching as the components are much smaller (also sometimes containing a small transformer). Very few of linear ones are also regulated, but they do exist. You should measure something near the rated voltage with a multimeter. Better to load it with a 1k THT resistor. If the voltage is wildly different then it is not regulated.

The current capacity of a switching PSU is much higher than for a linear PSU of the same size. Anything over a few hundred mA will be a switching PSU.

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Pricks sent a completely different switched supply, seems it is near impossible to get a supply for the Sammich now in the UK.

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It is the same in much of Europe, I think because transformers draw some current even when the secondary is unloaded. The only way to kill the power is to switch off the mains (which I always do) or to unplug the wallwart. So it is seen as a power-saving scheme.

Try rummaging through a second hand store or fleamarket for an old one. Alternatively you can still buy transformers and build your own, but need to be experienced with mains voltage and case it safely.

https://www.reichelt.de/Transformers-toroid/2/index.html?ACTION=2&LA=2&GROUPID=8880

 

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Yeah im not even chancing building my own, that is a recipe for death, it is time the Sammich went in the bin, it is of zero use to me now to be honest.

Edited by Flexinoodle

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Before binning, just try the one you were sent. The sFM has linear regulators for both power rails, so the noise might not be at all bad!

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its a SID not an FM, but im burnt out on this, spending hours looking for a power supply after the last one killing my LCD seemingly, its just an outdated design that is no longer usable to be fair, everything is switchmode now.

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OK gave in and tried, the backlight is definiately dead, not sure if i should chance trying a new screen or if it is just gonna burn out that too LOL.

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On 4/12/2019 at 8:00 PM, Flexinoodle said:

IRC is dead, thats why the chat is dead, Im gonna set up a discord in a bit, it is sad to see this place like this.

Hey flexi! Great to see you back. A discord server for MIDIbox is a great idea!

Has so much more features than IRC, now why didn't I think of that!

 

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Just now, Flexinoodle said:

https://discord.gg/V3uK88p

There is the MIDIbox Discord

Great work. Now we just need to add channels and moderators.

With Peter and Andys blessing we could push it on the midiphy facebook page also when its ready.

We have quite a following on their already! ;)

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