LPS (again).

HzTweaker · May 1

I tried going through some of the old LPS threads but the links are either "dead" or the model shown isn't enough "juice".

What I'm looking for is a 24 volt 4 amp output for a little desktop amp/rig I'm experimenting with. I'd like to compare the switching unit it came with to a LPS.

Any help would be appreciated.

VR3 · May 1

https://www.ebay.com/itm/325113573768?_skw=teradak+24v+linear+power+supply&itmmeta=01JT6KE2XN3KECFWH66XDD5BCF&hash=item4bb2477188:g:l2kAAOSw31JiOf-u&itmprp=enc:AQAKAAAA4FkggFvd1GGDu0w3yXCmi1d3pDSr91PYQwLgGYR93j+2vDe66qFUc7/bXOdV+jyPqbRLvLhbH0evcpP61YV9wGJtIv9Vd4TDJeFgm52oeJfjAVMmkjB+N/MMvFZCI7kcgKloxIumevSD6+A+J2EcNmPFOsK+9QRE5+rylCdY86B86uLE5w2m7bfXBQJ3QkSUEacoHbOR1OHyAAMMRyxhCTKtnwNOInBDiKvZp/AQlgge/3TgJo+4RE+5bfg4PehOwx0Pg+5khtZdTGY5fCfjRcpFFcCCkCrEqUNbRsdmIm2C|tkp:Bk9SR_iuuNPRZQ

HzTweaker · May 1

VR3 wrote: »

https://www.ebay.com/itm/325113573768?_skw=teradak+24v+linear+power+supply&itmmeta=01JT6KE2XN3KECFWH66XDD5BCF&hash=item4bb2477188:g:l2kAAOSw31JiOf-u&itmprp=enc:AQAKAAAA4FkggFvd1GGDu0w3yXCmi1d3pDSr91PYQwLgGYR93j+2vDe66qFUc7/bXOdV+jyPqbRLvLhbH0evcpP61YV9wGJtIv9Vd4TDJeFgm52oeJfjAVMmkjB+N/MMvFZCI7kcgKloxIumevSD6+A+J2EcNmPFOsK+9QRE5+rylCdY86B86uLE5w2m7bfXBQJ3QkSUEacoHbOR1OHyAAMMRyxhCTKtnwNOInBDiKvZp/AQlgge/3TgJo+4RE+5bfg4PehOwx0Pg+5khtZdTGY5fCfjRcpFFcCCkCrEqUNbRsdmIm2C|tkp:Bk9SR_iuuNPRZQ

200watts seems like over kill?

Nice unit none the less!

HzTweaker · May 1

Maybe something like this:

https://www.ebay.com/itm/125976315754

Looks cool with the screen and the chrome knobs

its linear, adjustable and I can use it for other test.

HzTweaker · May 1

HzTweaker wrote: »

Maybe something like this:

https://www.ebay.com/itm/125976315754

Looks cool with the screen and the chrome knobs its linear, adjustable and I can use it for other test.

I ordered one and inquired if the unit was equipped with a toroidal transformer. Either way its still going to allow me to try different PSs and listen to the difference.

heiney9 · May 5

Look here. https://www.fyfaudio.com/collections/finished-linear-power-supply

I just bought a nice 19V 5A LPS for my Roon Nucleus One. Great company to deal with. Very fast shipping. I got in before all the tariff non-sense. I'm not sure what the status is for tariffs (fees) if any at this point. Considering buying another smaller LPS from them. I don't see any pricing changes.

Mine was a Zero Zone brand. It has worked flawlessly and it was a bit less expensive than equivalent alternatives like Tera Dak or the same on Ali Express.

This would be a great option.

https://www.fyfaudio.com/products/100w-hiend-version-linear-power-supply-for-audio-device-dc5v-dc9v-dc12v-dc15v-dc16v-dc18v-dc19v-dc24v?VariantsId=10723

H9

P.s. This the one I purchased. For the Roon Nucleus One

https://www.fyfaudio.com/products/uper-hiend-19v-5a-linear-power-supply-for-intel-nuc-with-overvoltage-protection?VariantsId=10533

heiney9 · May 5

Not sure an inexpensive "bench" power supply is as good as a well designed (for) audio LPS. I bet overall it's noisier.

H9

HzTweaker · May 5

heiney9 wrote: »

Look here. https://www.fyfaudio.com/collections/finished-linear-power-supply

I just bought a nice 19V 5A LPS for my Roon Nucleus One. Great company to deal with. Very fast shipping. I got in before all the tariff non-sense. I'm not sure what the status is for tariffs (fees) if any at this point. Considering buying another smaller LPS from them. I don't see any pricing changes.

Mine was a Zero Zone brand. It has worked flawlessly and it was a bit less expensive than equivalent alternatives like Tera Dak or the same on Ali Express.

This would be a great option.

https://www.fyfaudio.com/products/100w-hiend-version-linear-power-supply-for-audio-device-dc5v-dc9v-dc12v-dc15v-dc16v-dc18v-dc19v-dc24v?VariantsId=10723

H9

P.s. This is the one I purchased, for the Roon Nucleus One

https://www.fyfaudio.com/products/uper-hiend-19v-5a-linear-power-supply-for-intel-nuc-with-overvoltage-protection?VariantsId=10533

heiney9 wrote: »

Not sure an inexpensive "bench" power supply is as good as a well designed (for) audio LPS. I bet overall it's noisier.

H9

Thanks so much for the suggestions. I'm seriously considering the second link option for this set up. I'd still like to try the bench unit first. I did inquire to the seller if the bench units power supply was at least a toroidal unit. They responded and said it was, so despite this being a cheap unit it seems to have some good qualities.

pitdogg2 · May 5

Just for giggles remember that when we were inventing the dreadnought torrid we actually had several that theoretically would work. Only two passed the muster to become the two that we use because they had less noise. So just because it is a torrid type supply that doesn't automatically make it viable.

My .02

HzTweaker · May 6

Copy that and thanks for the input. I'll report my findings when I get the unit. I shipped it snail mail from across the country so it might be a while before I get it.

skipshot12 · May 9

What a maroon……
I came here thinking this was about records.

HzTweaker · May 9

skipshot12 wrote: »

What a maroon……
I came here thinking this was about records.

Hilarious!

HzTweaker · June 26

Okay crew I have a couple questions for those who use and/or had LPSs custom made:

1: Has anyone else used an adjustable LPS and experiment with adjusting the voltage/amperage?

2: If you've had them made did you spec them for what the gear was rated or do you request them to be able to produce more voltage/amperage?

HzTweaker · June 27

The reason why I’m asking is I noticed a difference in performance with this little amp when I adjust the voltage up. I started experimenting with the voltage after driving the LPS into over voltage protection a couple times, so I turned the adjustment up to 30V. After listening to the rig several hours and over the course of a few days I remembered I did this, so after a Sesh while music was still playing I started turning the voltage back down to 24V. That’s when I heard it! I was as noticeable as adjusting the volume would be!

It was like listening to all the life of the song being drained away from it as the voltage was being turned down. The sound started going flat and the sound stage receded. Absolutely crazy. Now I leave it set at 30V.

Note: the amp does run a little warmer as a result.

mhardy6647 · June 27

Is whatever amplifier you're using designed to be used with 30 VDC input?
E.g., the working voltage ratings of capacitors therein.
If not, 30V might shorten its life considerably.

pitdogg2 · June 27

On the other hand if the caps are 50v rated, then that part of the scenario might be fine. Then again the extra heat could be problematic for other parts in the circuit.
Devils advocate

mhardy6647 · June 27

pitdogg2 wrote: »

On the other hand if the caps are 50v rated, then that part of the scenario might be fine. Then again the extra heat could be problematic for other parts in the circuit.
Devils advocate

50V would be OK, but as close as I'd want to cut it.
Yes, but I'd also wonder about the power amp module or output devices.
Heat is the enemy, but fundamentally - and were it mine - I'd want to make sure that the gizmo is rated for use with a 30 V power supply -- which it may well be. I skimmed the posts and didn't see what it was.

txcoastal1 · June 27

So lets get real, current draw with load on the PS. Can you pop the hood and take a meter reading across the + - where the output cable is attached inside the PS while it is operational.

Meter at the 24vdc with load, and the 30vdc with load. I have had cable runs that were to long for the gauge of wire was to small to power the device correctly due to voltage drop on load. So we upped the power supply from a 24v 3amp PS to 30v 5amp PS and reached our nominal voltage to run the device.

Pop the hood and post some pics

HzTweaker · June 28

mhardy6647 wrote: »

Is whatever amplifier you're using designed to be used with 30 VDC input?
E.g., the working voltage ratings of capacitors therein.
If not, 30V might shorten its life considerably.

I have no idea what its components are rated for. The amp (Dayton Audio DTA-PRO) was only $100 shipped so I'm not to concerned about it's life span. Plus I bought two of them.

The whole idea behind experimenting with this little inexpensive rig was to reignite my growing stale interest in audio. I'm glad to say it has.

Last night during a sesh I got curious and decided to see how low of voltage/amperage the amp would function on. Side note: I didn't take dB readings but the amp's volume was set to 66. The amp will operate down to 20V before tripping and the sound continued to "shrink" around the speakers as mentioned in my last post. It did work down to one amp but the second I adjusted the volume up one the LPS would trip.

txcoastal1 wrote: »

So lets get real, current draw with load on the PS. Can you pop the hood and take a meter reading across the + - where the output cable is attached inside the PS while it is operational.

Meter at the 24vdc with load, and the 30vdc with load. I have had cable runs that were to long for the gauge of wire was to small to power the device correctly due to voltage drop on load. So we upped the power supply from a 24v 3amp PS to 30v 5amp PS and reached our nominal voltage to run the device.

Pop the hood and post some pics

I like the idea of "popping the hood". I can't believe I haven't done so already tbh lol. I'll take pics and take meter readings and post my findings.

Thanks everyone for their input.

motorstereo · June 28

My 2 pence; I have a Fosi V3 integrated stereo amp that I use for my desktop rig and I have both the 30 volt and 48 volt power supplies. I have not noticed any change in sq at the volumes I listen to but there's a big difference in the heat produced. So for that one reason the 48 volt unit hasn't been used since the 30 volt unit arrived.

HzTweaker · June 28

Interesting. I don't know what's under the "hood" of the Fosi but if it's equipped with 50V caps than a 48V PS would be cutting a little close for my liking IMO.

Who knows, my cheep amp could have 30V caps in it lol. I'll find out tonight after work.

What PS are you using?

Does sound stage count under the category: sound quality?(that may or may not be a rhetorical question lol) That's what is being effected with each volt turn down. The sound shrinks around the speaker making easier? more obvious that the music is coming directly from the speaker.

motorstereo · June 28

I use the Fosi 30 volt ps that came with the unit and I dunno about soundstage shrinkage as it's nearfield listening. A cooler running unit is more important to me especially after the 100+ degree weather we had earlier this week.

mhardy6647 · June 28

HzTweaker · June 28

Found this on PE's website.

While I was there I requested a schematic for the amp.

HzTweaker · June 30

Well it turns out it has a 35V cap. I was cutting it close.

I'm not sure what the four (two on each side) black cap looking things on each side of the power cap are. Still waiting to see if I'll get a drawing from PE.

Took some pics when I opened it:

Saturday nights sesh when later than it should have

.

newbie308 · July 7

I may be wrong, but I think the 4 cans near the power capacitor are 100uH chokes.

HzTweaker · July 10

Thanks for the heads up. Based on a google search it appears that's what they are. PE isn't going to send a schematic. No worries

LPS (again).

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