[sdiy] Opinions on Switchmode PSUs for analog synths?

[mark verbos]

I put a regulator diode on the input side, to protect against reverse voltage frying it, but I’m not sure if that is necessary. The “15 VDC” comes in on a 2.1mm barrel connector from an external brick. It goes through a switch, a diode and a cap to ground before the DC-DC converter. The advantage is that it is 90% efficient, weighs less, can be plugged in anywhere in the world without a converter, doesn’t get hot, hardly takes up any space, maybe more….

I had to replace the transformer in a TR-909 this year because someone plugged a Japanese one into a European outlet. Inside, it’s just a jumper to change it, but the owner didn’t know that. It makes me wonder if replacing the transformer with a SMPS would be a better solution. I didn’t, but I wonder.

Mark





> On Nov 8, 2019, at 6:00 AM, Michael Zacherl <sdiy-mz01 at blauwurf.info> wrote:
> 
> 
>> On 7 Nov 2019, at 12:51, mark verbos <markverbos at gmail.com> wrote:
>> 
>> I use the ECLB40W-24D12 which is a 40W metal can one. It will take pretty much any DC you throw at it (9V-36V per the datasheet). I put some big caps to ground on the output of them.
> 
> 
> Hi Mark, so, how does your input side look like? 
> ATM that implementation appears like the (aforementioned) hybrid version to me where I can’t really see its advantage over a linear PSU. Only reason, maybe, I can’t find a +/- SMPSU using mains voltage?
> m.
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