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| Velleman/HQ Power PS1503SB (Mastech HY1503D) Review |
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| Balaur:
--- Quote from: saturation on November 09, 2010, 03:51:52 pm ---One main difference between what you have, which is an early Mastech type designs and the newer one which I chose is that there is a fine control for V and A, so you can set it more precisely, it has indicator LEDs for when its in CC or CV mode, and it has a fan for force cooling. It tops out at 30V. The soldering is less sloppy but functionally, your Velleman is very close in spec to mine. Under max loads, 30V 3A, the ripple drops to far under 1 mV, and holds at about 1-4 mV p-p under 1A loads, regardless of voltage. --- End quote --- Thank you very much for your feedback. I'll certainly look at your review. Yes, you are right about the early version. Indeed, I have found the schematic for the newer 1803/1503 devices and while most of the things are the same, there is a difference on how the output current sense resistor is connected. Maybe the new version has smaller voltage drop under load. I've also upped the maximum voltage from the default 15V to 18V by just adjusting a trim. There are no (IMHO) drawbacks to this and the source holds very well 3.3A @ 18.5V. Almost no ripple at the output. I would guess that the HY1503D/HY1803D of the same generation were identical units with different settings in order to propose a choice at whatever price point the customer was ready to spend. It's good that the new version has fine and coarse pots. I was looking at buying precision pots to replace the original ones and they are very expensive. I understand why Mastertech didn't provided those in the first version but decided to use two regular pots instead in the newer one. In the end, I have managed to find a set of precision pots at a very good price and I will use them in the PSU. Cheers, Dan |
| saturation:
Awesome! Nice that you easily hack another 3V out of it. Overall, the Chinese PSU are a lot more cost effective than building a PSU from scratch. Keep those reviews coming. I will later combine the two posts, get more details, and add pics as my time allows. Here are the links: https://www.eevblog.com/forum/index.php?topic=686.msg9661#msg9661 https://www.eevblog.com/forum/index.php?topic=1378.msg19872#msg19872 --- Quote from: Balaur on November 09, 2010, 08:25:46 pm --- --- Quote from: saturation on November 09, 2010, 03:51:52 pm ---One main difference between what you have, which is an early Mastech type designs and the newer one which I chose is that there is a fine control for V and A, so you can set it more precisely, it has indicator LEDs for when its in CC or CV mode, and it has a fan for force cooling. It tops out at 30V. The soldering is less sloppy but functionally, your Velleman is very close in spec to mine. Under max loads, 30V 3A, the ripple drops to far under 1 mV, and holds at about 1-4 mV p-p under 1A loads, regardless of voltage. --- End quote --- Thank you very much for your feedback. I'll certainly look at your review. Yes, you are right about the early version. Indeed, I have found the schematic for the newer 1803/1503 devices and while most of the things are the same, there is a difference on how the output current sense resistor is connected. Maybe the new version has smaller voltage drop under load. I've also upped the maximum voltage from the default 15V to 18V by just adjusting a trim. There are no (IMHO) drawbacks to this and the source holds very well 3.3A @ 18.5V. Almost no ripple at the output. I would guess that the HY1503D/HY1803D of the same generation were identical units with different settings in order to propose a choice at whatever price point the customer was ready to spend. It's good that the new version has fine and coarse pots. I was looking at buying precision pots to replace the original ones and they are very expensive. I understand why Mastertech didn't provided those in the first version but decided to use two regular pots instead in the newer one. In the end, I have managed to find a set of precision pots at a very good price and I will use them in the PSU. Cheers, Dan --- End quote --- |
| crosswick:
Hi there, Not being much of an electronics expert yet, I was wondering: could this power supply be easily hacked so that I can regulate/modulate the voltage output with an external line-level audio signal? Thanks! |
| saturation:
Yes, but you don't need a hack, all you need to build is a Class A power amplifier powered by this PSU. Peak of the audio signal = max Vout through of the signal =~ 0V --- Quote from: crosswick on April 20, 2011, 12:51:30 pm ---Hi there, Not being much of an electronics expert yet, I was wondering: could this power supply be easily hacked so that I can regulate/modulate the voltage output with an external line-level audio signal? Thanks! --- End quote --- |
| crosswick:
Thank you, I'll look into that. |
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