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Tekpower HY1803D Linear Variable DC Power Supply, 0-18V @ 0-3A

3.5 3.5 out of 5 stars 114 ratings
Currently unavailable.
We don't know when or if this item will be back in stock.
Brand Tekpower
Item dimensions L x W x H 10 x 5 x 8 inches
Manufacturer Mastech
UPC 690225496636 714833890706

About this item

  • Linear Output Voltage: 0- 18V @ 3A
  • AC Input Voltage: 110V @ 60Hz
  • Stable and low noise current up to 3A
  • 1 Year Tekpower Warranty
› See more product details

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Tekpower HY1803D Linear Variable DC Power Supply, 0-18V @ 0-3A

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Product Description

For sale is a brand new, professional DC regulated power supply from Mastech, Model number HY1803D. This is a highly stable, high quality linear power supply with its output continuously adjustable at 0-18V DC and 0-3A. The unit comes with 2 LCD displays, providing accurate readout for the voltage and current values.

Features & Specifications:

Adjustable outputs: 0-18V and 0-3A Variable controls for both current and voltage outputs

Input voltage: 104-127V

Switchable Line regulation: CV <= 0.01% + 1 mV, CC <= 0.2% + 1 mA

Load Regulation: CV <= 0.01% + 3mV, CC <= 0.2% + 3 mA

Ripple noise: CV <= 0.5 mV RMS, CC <= 3 mA

RMS Protection: constant current and short-circuit protection

LCD reading accuracy: +/-1% for voltage and +/-2% for current

Environment: 0-40C, relative humidity <90%

Size: 9" x 6.8" x 3.7"

Weight: 10 lbs

Warranty: 1 year

Customer reviews

3.5 out of 5 stars
114 global ratings

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Customers say

Customers find the system power device functional and affordable. It performs well for them, providing clean DC power for small electronics projects. The adjustable voltage and current settings are easy to set using the coarse adjustment dials. While most customers appreciate the appearance, some have mixed opinions on ease of use, voltage stability, and display quality.

AI-generated from the text of customer reviews

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FunctionalityValue for moneyVoltage adjustmentPower supplyAppearanceEase of useVoltage stabilityDisplay quality
61 customers mention "Functionality"46 positive15 negative

Customers appreciate the product's functionality. They find it works well, performs well, and helps them produce quality work. The unit is compact and has a useful V/A range of operation. However, some customers cannot adjust anything with the dials. Overall, the quality is acceptable, although some have reported issues with the capacitor.

"...The main filter capacitor, despite being a decent brand (Nippon Chemi-Con) was near failure, drawing a ton of DC current and..." Read more

"...this seems like the Ford Escort of power supplies: Good enough to get the job done, but without any luxury or frills." Read more

"...-three-year-old unit that I'm about to order a second one... it's high quality, it's correct, and it's still a better buy than you can get even on..." Read more

"(Jan 2012) I have had mine for some time now and it works fine...." Read more

34 customers mention "Value for money"26 positive8 negative

Customers appreciate the value for money of the product. They find it simple, inexpensive, and accurate for its price.

"...costs down, but if you know that going into it, I think this is a good deal...." Read more

"This is a great value general purpose power supply...." Read more

"The price seemed too good to be true...." Read more

"...This is not a high grade supply you'd want to use in applications where fractions of a volt or amp can let the magic smoke out of components...." Read more

21 customers mention "Voltage adjustment"17 positive4 negative

Customers find the voltage adjustment easy to use. The coarse adjustment dials are sufficient, and the current limiting factor is a nice touch. The single adjustment knobs for voltage and amperage are sufficient for critical supply voltage settings and monitoring/limiting current.

"...Single-turn pots, but easy to adjust voltage by single digits. Current is a bit harder...." Read more

"...I agree with other posters that the coarse adjustment dials are sufficient, and I found it easy to adjust the voltage or current to within practical..." Read more

"...the supply voltage and monitor/limit current, allow for easy resetting the voltage manually for various stages of the charging/maintenance process...." Read more

"...It offers separate controls for both voltage and amperage, allowing for a multitude of uses...." Read more

19 customers mention "Power supply"14 positive5 negative

Customers find the power supply provides clean, accurate DC power for small electronics projects. They appreciate its well-regulated and adjustable output of 18 volts with dual controls for amps and volts. Overall, they find it a good variable DC power supply for the price.

"...All things considered, this is a great power supply." Read more

"This is a good general purpose power supply that doesn't take up a lot of space on your test bench. It has large, brightly back-lit, LCD indicators...." Read more

"...being a decent brand (Nippon Chemi-Con) was near failure, drawing a ton of DC current and getting quite warm...." Read more

"This is a good power supply, but it has a few things that may bother other users...." Read more

10 customers mention "Appearance"10 positive0 negative

Customers like the appearance of the product. They say it has a nice appearance and shiny new nickel-plated parts.

"...Nice displays and backlights. Good, solid transformer, pass transistor, heatsink, etc...." Read more

"...The display is LED lit, and looks very nice when on...." Read more

"This P.S. has a nice appearance. It came,fulfillment by Amazon, well packaged. I think the construction is good...." Read more

"...It has a metal case and a good look to it. I am an old school techie and am happy as could be with this purchase...." Read more

20 customers mention "Ease of use"13 positive7 negative

Customers have different views on the power supply's ease of use. Some find it simple and convenient, with no learning curve. They say it's a great time saver and perfect for beginners. Others mention that the adjustment is coarse, takes effort to fine-tune, and the instructions are confusing. The controls are also described as a bit too coarse for their liking.

"...packs to drive the prototypes this variable power supply is a great time saver...." Read more

"...A simple and compact supply like this makes it easy to confirm the current draw of many types of DC devices for those curious about such details...." Read more

"...I found the controls to be a bit too coarse for my liking - I would have preferred fine/coarse controls - but with some patience it is possible to..." Read more

"Simple, convenient and (somewhat) portable, this power supply does what is suppose to do...." Read more

13 customers mention "Voltage stability"9 positive4 negative

Customers have different views on the voltage stability of the product. Some find it stable, with a large digital display and steady output. Others report that the voltage swings wildly, with amps and volts going up and down chaotically. The current would spike along with the voltage and then fall below constant current setting.

"...Output is fairly steady and the display is pretty accurate, typically within .1V of measurements from my Fluke DVM...." Read more

"...It stays solidly at the set voltage above that, though." Read more

"...It is December 2015, and it is starting to s*** the bed. The voltage fluctuates. I cannot use it for general purpose applications...." Read more

"...The selected voltage remained stable. By this I mean that once I selected a voltage, it stayed there...." Read more

12 customers mention "Display quality"8 positive4 negative

Customers have different views on the display quality. Some find it accurate, with a large digital display that provides the typical information needed from a power source like voltage and current. However, others report issues like mixed readings, LCDs not showing any values, and some segments of the display failing early in the product's life.

"...The digital display is great and I have no regrets of buying this model rather than the lower priced one with the analog display." Read more

"...Quickly the digital display began to give a mix of readings, Amps and Volts going up and down chaotically, jumping all around!..." Read more

"...Output is fairly steady and the display is pretty accurate, typically within .1V of measurements from my Fluke DVM...." Read more

"...be nice to have backlights for the LCDs but they are readable enough in normal room light...." Read more

Plates copper like a champ!
5 out of 5 stars
Plates copper like a champ!
Did some epic electro copper plating.. works fantastic even with large steel parts in simply muratic acid solution from home depot.. honestly such a good deal for reals!
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Top reviews from the United States

  • StanS
    5.0 out of 5 stars A great value for its price
    Reviewed in the United States on December 7, 2011
    Verified Purchase
    One of my responsibilities of my job is to design pet toys. Recently, our company made a decision to develop battery driven toys for cats. As a substitute for various battery packs to drive the prototypes this variable power supply is a great time saver. Not only does it allow me to check the performance of a toy using different voltages but also to determine the amp draw of the motor to allow us to specify what type of battery is needed in the production models. The only down side that I can foresee is that the voltage output is limited to a max of 18 Volts. The digital display is great and I have no regrets of buying this model rather than the lower priced one with the analog display.
    3 people found this helpful
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  • Buzz D.
    3.0 out of 5 stars Merely Adequate, Questionable Construction
    Reviewed in the United States on February 27, 2012
    Verified Purchase
    First, I'll admit that I was not expecting excellence at this price point. My unit arrived in excellent condition, both the inner and outer boxes were in perfect shape. Once removed from the packaging and installed on my bench, first impressions were positive - solid feel to the knobs, recently heavy case, and nice power switch. My only complaint is that the banana plugs on the front of the unit are not firmly attached to the case and experience some wobble when I attach leads.

    Output is fairly steady and the display is pretty accurate, typically within .1V of measurements from my Fluke DVM. I found the controls to be a bit too coarse for my liking - I would have preferred fine/coarse controls - but with some patience it is possible to dial in. Since I almost always have the unit set to 5VDC for digital work, this is not a huge issue for me.

    If I was purchasing again, I would probably buy a dual-supply unit with a backlit or LED display. For the price, however, this is an adequate solution.
    3 people found this helpful
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  • A. Lockwood
    1.0 out of 5 stars Not bad
    Reviewed in the United States on March 28, 2012
    Verified Purchase
    NEW EDIT: I withdraw "not a bad power supply". I blew the pass transistor tonight pumping 3A into a near short for an extended time. Definitely a stress test, but still within the specs! Taking it apart to fix it, I notice three things: 1) There is NO thermal shutdown circuitry at all. No wonder the transistor blew. 2) The thermal transfer between the transistor and heat sink is atrocious. Just a little, quite thick, pad. No paste at all. 3) The main filter capacitor, despite being a decent brand (Nippon Chemi-Con) was near failure, drawing a ton of DC current and getting quite warm. (Dropped to just one star because operating a device within its advertised specifications should never break it.)

    Not a bad power supply. The knobs and banana jacks are a bit iffy, but not horrible. Single-turn pots, but easy to adjust voltage by single digits. Current is a bit harder. I didn't have the grounding problem that someone else reported, but I suspect something was shorted in his (the internal assembly is atrocious; I wouldn't be surprised). Nice displays and backlights. Good, solid transformer, pass transistor, heatsink, etc. I wouldn't mind a load switch and a CC set button, but for an $80 power supply, I can overlook it.

    Voltages according to my B+K 2712 (±0.1%,5dgt DCV, ±2% DCA): set 00.0, 02.0, 04.0, 08.0, 16.0, actual 0.0037, 2.0067, 4.047, 7.997, 15.972. Short-circuit currents: set 0.00, 0.10, 0.20, 0.40, 0.80, 1.60, 3.00, 3.13 (maximum), actual 0.000, 0.100, 0.201, 0.406, 0.801, 1.602, 2.994, 3.114. Ripple according to my old analog 'scope: 1mVpp at 10V with no load; 7mVpp with 100mA load; 5mVpp with 1A load.

    EDIT: The drift on this thing at voltages under about 3V is really bad. If I set it to a voltage in that range and watch it with a voltmeter, the voltage drifts around a few tenths of a volt in either direction constantly! It stays solidly at the set voltage above that, though.
    9 people found this helpful
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  • Lorax
    4.0 out of 5 stars The Ford Escort of power supplies.
    Reviewed in the United States on February 2, 2011
    Verified Purchase
    I'm starting to get back into electronics hacking after a long hiatus, and this is a good tool for that purpose.

    It arrived with the feet punched through the single wall cardboard box, and sawdust or dirt or something on the feet and bottom inside the plastic bag. It's clear they cut every corner they could to keep costs down, but if you know that going into it, I think this is a good deal.

    I tested it out by hooking up a couple of 500 watt lights, and it delivered 18.8V and 3.1A, so it meets the specs. I heard only one relay click at about 9V, which means that it uses only two taps from the transformer... Other power supplies click a few times or more; more taps would make it waste less power throughout the range and run cooler, but if you use it infrequently wasting a bit of AC is not a big deal.

    The meters seems decently accurate; my fluke 189 said 18.64V when it said 18.8V. The fluke said 3.077A when the mastech said 3.11A.

    I'm not sure about the ripple though. I put the probe of my new Instek 1062a digital storage oscilloscope onto the banana clip outputs, and it measured approx 2mVpp ripple (varied from about 1.6mVpp to 2.4mVpp, mostly staying above 2mVpp). This is higher than the rated 0.5mV But when I tried switching between the 1x and 10x settings of the probe the measured ripple didn't change nor did waveform ripple that I saw on the screen, so there's something weird about my measuring setup; the 2V test signal on the oscilloscope at 1X did change to a 200mV signal with the 10X setting. I'm a beginner at using my DSO so take this with a grain of salt and if anyone can explain how to get a more reliable ripple measurement please tell me.

    I did try powering a cheap old radio shack amplifier (277-1008c) with it, and didn't hear any more noise or hum than when powering it from 9V battery, so the ripple so far isn't an issue for me.

    The binding posts are extremely cheesy; there's no hole in the posts so you have to wrap a long section of wire around the post, and there's only a very small contact area on the post base, making bare-wire connections not very practical. I think using banana plugs or perhaps spade connectors is the way to go with this. Probably not a bad idea to use a banana to binding post converter for bare wire connections, which you can easily unplug during power on to avoid any spikes from frying your circuits.

    I agree with other posters that the coarse adjustment dials are sufficient, and I found it easy to adjust the voltage or current to within practical tolerances. I did find that the Voltage dial tends to cover up the "Voltage" label when this is on a tabletop, so I got confused and thought the Current label above it applied to the Voltage dial. Newbie mistake; I'll probably attach my own labels to make sure I don't get them confused. It would be nice to have backlights for the LCDs but they are readable enough in normal room light.

    Overall, this seems like the Ford Escort of power supplies: Good enough to get the job done, but without any luxury or frills.
    70 people found this helpful
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