Hi folks
I bought an old fibre network thing to repurpose the 1U case to house a phono preamp.
However, inside I found a rather nice pair of SMPS, each appears to have a pair of +13v rails and a pair of Grounds.
Now, I'm thinking, this could make a rather nice dual supply - one SMPS for each of the left and right channels.
Is it possible to hook up these supplies to produce a 26v single rail that I could then drop using a regulator to the 18v my preamp board needs?
I bought an old fibre network thing to repurpose the 1U case to house a phono preamp.
However, inside I found a rather nice pair of SMPS, each appears to have a pair of +13v rails and a pair of Grounds.
Now, I'm thinking, this could make a rather nice dual supply - one SMPS for each of the left and right channels.
Is it possible to hook up these supplies to produce a 26v single rail that I could then drop using a regulator to the 18v my preamp board needs?
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Cheers PRR, that's what I needed to know.
I've got several small toroids I could use, I was just considering trying something different, I might use the SMPS just to see how it sounds, a learning exercise.
I've got several small toroids I could use, I was just considering trying something different, I might use the SMPS just to see how it sounds, a learning exercise.
I found a switch salvaged from some old piece of equipment in my box of bits that happened to fit perfectly in the hole the second power socket occupied (each SMPS board had it's own socket) and a ferrite ring with some heavy duty mains cabling threaded through it so I wired up both SMPS boards to the single socket via the switch, placing the ferrite ring between the socket and switch. I used some yellow heatshrink to make sure all the dangerous voltage bits are well insulated.
Total outlay on this project so far is 4.19ukp - the fibre switch cost 99p on ebay with 3.20 postage, the switch and bits of wire with ferrite ring I found in my stash.
I'm not sure what I'll use this enclosure for, maybe a DAC or headamp that only requires 12v supplies.
Total outlay on this project so far is 4.19ukp - the fibre switch cost 99p on ebay with 3.20 postage, the switch and bits of wire with ferrite ring I found in my stash.
I'm not sure what I'll use this enclosure for, maybe a DAC or headamp that only requires 12v supplies.
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Be careful in case SMPS zero volts is grounded or that could cause a problem if any other part of your system is grounded.
A quick buzz test between SMPS zero volts and earth will tell you.
A quick buzz test between SMPS zero volts and earth will tell you.
Hi Nigel, always good to hear from a fellow Cumbrian, I hope the weather is as nice and sunny up in Carlisle as it is down in Millom.
This thing has three earth points, one for each SMPS and a third at the front below them that was connected to the mainboard I removed.
Pardon my ignorance, but how would I do that buzz test?
This thing has three earth points, one for each SMPS and a third at the front below them that was connected to the mainboard I removed.
Pardon my ignorance, but how would I do that buzz test?
Buzz test is just a continuity check between earth and SMPS zero volt line using multi meter. If they are connected it could cause a problem if any other equipment is connected.
Just do an ohms test with a DMM.
Some meters have a continuity test function that buzzes if you have continuity.
Some meters have a continuity test function that buzzes if you have continuity.
I've been delayed by having to repair my speakers, but tonight I got the DMM out to test the earth connection. Unfortunately, when I flipped the power switch there was a crack and some blue sparks from the back of the switch. No disgn of any scoring or burning, I think there must have been a short, perhaps in the switch itself as I am positive my wiring was correct.
So I decided to go to plan B, I ripped out the power switch and both SMPS units, I am replacing them with a pair of toroidals, a pair of rectifiers and some linear regulators.
So I decided to go to plan B, I ripped out the power switch and both SMPS units, I am replacing them with a pair of toroidals, a pair of rectifiers and some linear regulators.