Adjustable DC Power Supply (0-30 V 0-5 A) HANMATEK HM305 Mini Variable Switching Digital Bench Power Supply
HANMATEK Upgraded HM305 Mini DC Power Supply
The 2020 upgraded HANMATEK HM305 has an amazing design. The full-screen design and the all-metal body make it look so exquisite. Compared with similar products, it has a smaller size, only 9.0inx5.9inx3.1in, compact and portable. Based on feedback from a large number of users, we have increased Output Switch control, Anti-collision lock and other practical functions. We used a better circuit board. This variable DC power supply is a very stable, regulated DC power supply. It has the characteristics of low ripple and noise, high accuracy, high reliability, perfect overload and short circuit protection circuits, and it is especially suitable for laboratory, school and electronic maintenance. Designed for laboratory and industrial use.
Output Switch Control
Sometimes we need to switch another voltage or current , but we often forget to unplug the previous instrument and cause the instrument to burn out,which often occurs in the maintenance.Output key is designed to solve this problem.By long pressing the Output button,the required voltage and current can be adjusted without the actual output power,Which makes this DC power supply more secure and more energy efficient.
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Anti-collision LockPress and hold the current adjustment button to lock the current and voltage. It prevents wrong voltage and current output caused by accidental collision. | Compact and PortableDue to the use of a more compact circuit board, this DC regulated power supply is also more compact under the conditions of richer functions and higher accuracy, the performance is beyond linear power supply. Compared with liner DC power supply, more compact, lighter, portable and Compact and the size is only 9.0inx5.9inx3.1in | Package Included:1 * HM305 Regulated Power Supply 1 * Power Supply Cable 1 * Input Iower Cable 1 * User Manual |
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| Precision Accuracy | 4-Digital Full LED Display | 4-Digital Full LED Display |
| Output DC Current | 0- 5A | 0 – 10A |
| Output voltage | DC 0-30V | DC 0-30V |
| Display Data | Voltage / Current / Power | Voltage / Current / Power |
| Display resolution | Voltage: 0.01V Current 0.001A | Voltage: 0.01V Current 0.001A |
| Security | Multiple protections，FCC &CE certified | Multiple protections，FCC &CE certified |
| Output Power Cord | x 1 | x 1 |
| Input Power Cord | x 1 | x 1 |
| Voltage Ripple: | 10mVrms | 10mVrms |
| Current Ripple: | 8mVrms | 8mVrms |
| Weight: | 1.84 kg |
| Size: | 30V-5A |
| Dimensions: | 29.2 x 22.4 x 15 cm; 1.84 Kilograms |
| Part: | HM305 |
| Pack Quantity: | 1 |
| Batteries Required: | No |
| Batteries Included: | No |
| Manufacture: | HANMATEK |
| Quantity: | 1 |
| Reference: | HM305 |
| Size: | 30V-5A |
Unit working well, no problems —– EXCEPT “NO” Banana probe leads supplied … ?
The PSU moves from the constant voltage (at less than the max specified current) smoothly into a constant current (dropping the voltage to limit the current). So as they say, “it does exactly what it says on the tin”.
There are some electrical benefits of this PSU that may not be immediately obvious:
1. Voltage can be set with the device under test (DUT) connected (but without power applied
2. PSU can also be isolated from the DUT quickly e.g. if something “goes wrong” when you are testing
3. Constant current can be set without needing to disconnect the DUT and connect the crocs together
4. Two “locks” are engaged/disengaged by “long pressing” the current or voltage knob
5. There is a “lock” light to confirm that a lock was set or removed
6. PSU case is earthed for safety but the output is “floating” e.g. the output isn’t grounded
7. With a second PSU you can create a dual PSU e.g. -5V – + 5V @ 5A
8. Set each digit individually or let it roll over or clear e.g. 5.99 becomes 6.00
9. Resets to 0 or max with a twist e.g. select ‘5’ and 5.00V –> 0 –> 12.6V (logical and easy)
10. First of two “locks”: press and “long hold” in the voltage knob. A lock symbol appears. If the PSU was displaying OFF then after a power failure the supply stays OFF. If ON, it comes back ON (logical and easy)
11. Second of two “locks”: press and “long hold” in the current knob. A lock symbol appears. This locks and unlocks the PSU so that small fingers (children) can’t adjust the PSU e.g. turn up the voltage
12. Ripple and regulation are also very well controlled (I have not seen a better example of consumer PSU)
Mnemonic: long press of the “voltage” knob sets the “voltage” after a power outage e.g. ON or OFF.
Mnemonic: long press of the “current” knob keeps the “current” voltage/current setting
These are logical and easy e.g. if you know that the output is OFF before setting the “voltage” lock and the “current” lock is either locked or it isn’t – simply click the current knob and confirm it is locked/unlocked.
5A supply is enough for most electronics uses e.g. using more than 5V @ 5A or 12.6V at 5A would be unusual. For higher power, there is also a 10A version. Although two PSU can make a -12V – 0 – 12V @ 5A, two PSU cannot be joined to make a single supply 12V @ 2x 5A = 10A because up to 10A (or a preset current) is OK but the constant current cannot adjust correctly. For this, it would be better to use one PSU for up to 5A and a second PSU for up to 5A to separately connected pairs of equipment. One PSU controlling a 2nd PSU (master-slave) would be very unusual and require an additional “control” connection.
Three “test” scenarios (all easy and logical to setup):
1. 12.6V @ 3A PSU. Current limited to 3A, voltage is locked and PSU resumes after a power failure
2. 5V @ 5A PSU. Current is initially limited to 5A, voltage/current is variable and PSU shuts down after a power failure
3. 24V (negative) – 0 – 24V (positive) @ 2A dual PSU e.g. for an amplifier (requires TWO PSU)
In case you were in doubt, I like the 5A PSU very much and ordered a second 10A PSU as well.
Lovely bit of equipment! Dead easy to use, and very accurate, one of my favourite bits of kit
Great value and compact. I love it! Buy one! 🙂
I have made a number of my own PSU’s and all have been transformer based and weighed a ton (slight exaggeration) so it was nice to get something this light. It works well and looks to give accurate readings. So far I have only tested it at 2 Amps but it holds the volts steady. Great for project work. The instructions could have been printed in larger text as I had to balance a second pair of glasses on my reading glasses to read them..
Works well for testing laptops and mobile phone well built and even looks nice on the desk as its small
I wanted a “proper” power supply and this was perfect for the job.
Not too big and a really neat little unit
I designed a cable holder to clip in the top just to keep the cables attached but tidy
Only had for a day. So far so good. Will add more to this review as time goes on.
Four stars at the moment though as the case is not grounded. Someone has written that the chassis is properly earthed… But it isn’t earthed whatsoever. I have rectified this on my unit to make it safer.
Yep, can’t complain. Does the job nicely. Thanks. Doesn’t get too warm either.
There’s no information on the manual about C.C/C.V modes and conditions for them. Otherwise no problems during 3 months of me having i
I only give it four stars because the capacitors inside are a bit suspect. JWCO aren’t exactly quality, and I’ve never heard of “Mscon” before; I can only assume they have fake Marcon branding. Given how nice this power supply is overall I’d recap it with something from KMET, Panasonic and/or Nichicon if you plan to keep it for longer than a few years.
I like the fact that it has two power buttons. One main switch and another for the output. And that the coupling can be done to bare wires. The configuring procedure seemed weird at the beginning, but that just because I have another power supply with knobs.
here is a look on the power supply that stops you turning it up or dow
easy controls, stable voltage and consistent. If you want a standard basic supply you won’t go wrong with this.
I have tested it with my inverter on the bench for 20 minutes running max 5A, the fan will come on when it sense internal temperature is hot. Overall the bench DC worked as it should, could do with a longer kettle lead but 1m is ok as power socket is never too far from my test bench anyway.
Fantastic little 150w lab supply. I have some high power (4aH) Nicads nothing would charge. This did the job! Only slight gripe is the time you have to turn the setting knob after selecting the digit to change. It’s about 1 second before it times out! But a minor gripe that is overcome with some practice!
Controls are really easy to get the hang of, just press in the voltage knob to adjust voltage, same for current. Press again to fine adjust digit by digit. Easy to get used to and very simple.
Does exactly what it needs to. So far (day 1) a great bench supply.
Happy to recommend.