Features:

  • [DC regulated power supply] 0-30 Volts and 0-5 Amp outpouts with alligator clip leads, 3 LED digital display.
  • [Auto Conversion] Current can be converted from ''A'' to ''mA'' though The Movement of Decimal Point. It can be operated as constant current or constant voltage source.
  • [Multiple Protections] Upgrade Elastic Handle, easy to carry, Automatic cooling fan, exhaust fan protection, overload and short circuit protection to prolong service life of product.
  • [High Stability] Voltage stability: <0.01%+3mV, Current stability: < 0.2%+3mA, Ripple & noise :< 3mArms
  • [Wide Application] Suitable for the laboratory, electronic, communication equipments maintenance, products line, scientific research and teaching units
Perfect for Students!

I am a college student majoring in Electrical Engineering of Technology. This DC Power Supply is perfect for working at home on your circuits. Whether you didn't finish a lab, or just want the extra practice this device works brilliantly. It is adjustable from 0V-30V which is perfect for beginner/intermediate circuitry. Overall I am very satisfied and would recommend to anyone who major in Technology. You have to purchase banana to banana test leads seperately if you want to connect it straight to your breadboard, but there are other ways around this. You don't actually need them. It makes a noise when on, but if you have an xbox or something of that nature you will be used to the sound. Not bad if you are searching for an in-home DC power supply. Get this one!

Dr. Meter DC Power Supply PS-305DM

This is a wonderful unit for my needs. I use it to charge a 10s5p battery pack for my e-bike. If you do not know much about these battery packs, this is 50 very high energy, high capacity 186050 batteries setup as 10 batteries in series, and 5 parallel groups of 10 (36 volts, 12.5 amps). Between this charger and the battery pack I use a hobby balance charger as you can see in the picture. There for I get a GUI of what is happening while and during the charging. I set my voltage to 17 volts, and amperage to 5 amps. I can also set the charging amps on the balance charger. I set the balance charger to charge the batteries at 2 amps. During charging, the amperage and voltage readings stayed rock solid steady. No fluctuate of both the voltage and current. The last time I charged it took 4 hour, and Mr. Meter held up just fine. Very little heat came out of the back fan. No temp. shut downs. Got a little hot at the bottom of the unit (I’m guessing this is where the step-down Transformer is sitting-that’s to be expected). In all..I’m very pleased with this little guy. For the price, it’s works like a champ.

High Power Load Test - Worked Great.

I purchased the HY3005M-S a couple weeks ago, and I have been using it for basic hobby stuff, like MSP430 microcontroller and Raspberry Pi type projects. These are all low voltage projects at 5V. I noticed that the power supply was running completely silent even with high current loads such as a 1m string of NeoPixels at full brightness, which is about 2.5A. (full brightness not shown) That got me wondering whether my fan was broken, so I decided to put the supply to a full power test. I put together a 6' 150W load using fifteen 10' 10W power resistors. At the maximum voltage of 30V the supply should be at the maximum 5A output, and 150W output power. I verified the output voltage using an Amprobe AM-510 multimeter. I connected the test load, and increased the output voltage from 1V up to 30V in 1V increments. Test results are provided below. At the maximum setting the fan was definitely running. I left it at the maximum output power for 30 minutes and the output voltage remained stable. The test load was getting smoking hot so I decided that was good enough. The outside case of the power supply was cool to the touch, except for one spot underneath the supply at the front, near the output terminals, however even that location wasn’t hot enough that I would be concerned. I was quite happy with the results. Test passed. I was however surprised that when I hit the output off button, that the fan shut down immediately. When I turned the output back on, the fan came back immediately as well. So I decided to look into this a little. It turns out the fan speed is set by the selected output voltage, and not temperature as one might think. Starting at 1V and going upwards in 1V increments, the fan started running (slowly) at 10V and got faster as the voltage approached 30V. On the way down, the fan slows down, and stops when it reaches 5V. So, this explains why it was running completely silent for all of my 5V projects. Anything at 5V or less, the fan will never run. Just to be diligent (not that I wanted to ruin my supply) I decided to run one more test at 10V into a 2' 50W test load, since this represented the highest output power without any real air flow. I picked 10V instead of 9V since 2' was just 1/3 of the 6' test load. The fan was just barely running at 10V, with no noticeable airflow. Output current was at 4.768A. I left it like this for 30 minutes. This time the hot spot was on the bottom-side, just a little farther back than it had been during the 30V test. It was definitely warm, but still not what I would consider too warm. I would consider this test a pass as well. I also tested the current-controlled mode set to 3A, and it limited the output voltage as you would expect. I also accidentally shorted the output twice using a bad cable (my fault, not theirs), and the power supply handled that nicely, and recovered immediately once I fixed my connection. I am very happy with this supply. I would buy it again, and I would recommend it to others. It is a great bench supply for hobbyists.

Unique Dr. Meter power supply characteristics makes troubleshooting simple in complex circuits!

The Dr. Meter PS-305 single output power supply is AWESOME! I have used lab power supplies for many years, but this one "takes the cake!" There are features of this power supply that are extremely desirable, but are little-known, and not commonly found in ANY power supply. Both the voltage and the "current limit" are separately adjustable. You can short out the test leads, and adjust the maximum current limit to any amount you want, from one milliamp to five amps, using the adjustment knobs. Then, you can set whatever voltage you want to be available at the output terminals, provided the current demanded does not exceed the "current limit" you previously set. Or, as an alternative, you can set the voltage to zero, and then use the power supply readout as a voltmeter! I was repairing an oscilloscope which had an insufficient voltage on a -15 volt buss. Since the output from the Dr. Meter power supply is floating (with respect the earth ground), I simply connected the Dr. Meter output leads in parallel with the (insufficient) -15 volt supply (which was reading around -4.5 volts). Then I simply adjusted the Dr. Meter output voltage to 15 volts (while disconnected), and reconnected the leads. Still reading -4.5 volts, but limited to 10 milliamps. Then I slowly started increasing the current until the voltage read 15 volts, in-circuit. The current was around 60 milliamps. The problem was a bad transistor in the -15 volt power supply regulator circuit. With the Dr. Meter power supply providing the needed boost, the oscilloscope came alive once again, in just a few minutes!

Can't beat it

Constant current, constant voltage 30 volt, 5 amp power supply for $60 ? Can't believe they can sell this for $60. Tested all of my dc project motors and charged all of my sealed lead acid and lithium batteries without a hiccup. Used a diode to prevent back feed. Now I guess I'll have to wait until someone gives me another project until I can use it again. I'll probably just play with it in the mean time. I found the fan to be very quiet compared to others I've used. The readout is large and bright and the fine adjustment works great. One nice feature is the button to disconnect the output. Very usefull when charging more than one battery or testing more than one device. I just hope it lasts a long time. After looking inside at the components I have no reason to believe it won't.

The unit is VERY light (switching) which is very good. There is a instructions manual but the unit ...

I just received this power supply, shipping was fast and the price quite right. The unit is VERY light (switching) which is very good. There is a instructions manual but the unit is very intuitive. What was not intuitive but was in the manual were: How to lock the voltage and current settings (clicking the decimal point for 3 seconds) and the location of the fuse at the AC connector. The red and black banana to alligator cables and very nice (thick and looked very solid). I tested the unit with two digital multimeters, an oscilloscope (Rigol DS1102E) and a 8 ohms 100 watt resistor. I started with no load and setting the voltage to 25.00 V, . Without any load I measured the ripple with the oscilloscope and 1.2 volts of ripple (Vpp). While switching power supplies have much more ripple than linear one, this was a bit high, but I wanted to measure it under load. I set the voltage 28.28 on the unit and placed the 8 ohms 100W resistor as load and the unit delivered 3.4 AMPs and the voltage dropped from 28.75 to 28.4 volts (measured with the multimeter) which is not bad at all given the amount of current being drawn. I have no reason to doubt that the unit will be able to deliver the 5 AMPs it claims, since the fan never went on (I did not hold the test long enough for the heat sinks to become warm, but the 8 ohms load resistor was getting too hot for the bench). I opened the unit to see how it was built. No issues there for the price.

Workhorse of a DC Supply (30V/5A) at an Excellent Price! A+++

When comparing the cost of lab DC power supplies it is very hard to beat the value of the PS-305DM. I looked at many sites, including Ebay and MCM, even with DIY supplies it would still cost 80% of the PS-305DM. Since purchasing this DC supply I have used it multiple times a week for projects/assignments in Electrical Engineering without any issues. This DC supply has multiple protection features built in to prevent you from harming yourself or your equipment. Offering both Constant Current and Constant Voltage modes along with positive, negative and neutral outputs. I have ran this unit for hours on end and never once had it overheat or cause any problems. The voltage/current values shown are usually within 1-2% of the actual output (I checked my unit with a Tenma 72-1020 TrueRMS Meter).

It's ok for the money..

I work on circuits which are supposed to be powered off noisy wall warts so I don't mind the noise in the power supply, it actually helps my case as it forces me to deal with noisy power rail. But if you're looking for clean low ripple, low noise power supply this is not it. A quick measurement of ripple and noise at 20mA showed Vpp 152mV with the Vrms of 40mv. That's with barely any load at 5V. Some reviewers wrote that the power supply had overshoot on power on, I certainly did not measure any with my oscilloscope. Not sure how they measured but multimeters themselves can have overshoot when measuring, especially when they are in autorange mode. So I am not sure if my power supply doesn't exhibit this issue or the measuring method used by other reviewers is flawed. Accuracy is fine. The resolution is obviously low but I found it to be spot on in my measurements. The cooling fan is always on and there is a significant hum when it's on. I did not find the hum to be annoying though. The controls are sufficient. Overall, for the price (which is really low) this is actually not bad at all. While it's far from perfect for the price you really cannot ask for more. I give it 5 stars based on that. If you need a bench supply for your lab that can deliver clean power, than look elsewhere. But you will also spend significantly more money.

Great all-purpose power supply!

Gone are the days of having a bunch of small power supplies for various projects. This thing works great!

Well built and works as advertised.

Stable and precise power supply for the bench. Happy customer

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