GVM H3 JBC clone with three handles, a transformer-driven heater, for 136 bucks? - Page 1
Forum section: electronics / general

author: drksy
author_rank: Regular Contributor
timestamp: November 04, 2023, 10:54:20 pm
content: There's a new soldering station that just got released recently on Aliexpress. It's theGVM H3soldering ironhttps://www.aliexpress.us/item/3256805958738052.html.- includes all three T245, T210, T115 handles.- 70 W transformer- nice lcd display- no overshoot in temp regulation- brass wool with splash guard- holder with standby mode and even an antenna- similar connector for handles to JBC, looks like it could support the real handles as well- even the back of the iron holder has a spot to catch dripping solder, good attention to detail that a lot of Chinese clones forget about.I mean, all three handles and a transformer? It looks too good to be true. The only downside I can see right now is the transformer secondary voltage is 12V, which is a bit low for the C245 cartridges, but it's perfectly fine for C210 and C115, and the video demonstration showed a pretty quick heat up for the C245.This looks like a new product that was just released. Has anyone seen it? There's currently no reviews or anything online. There's not even much customer reviews on this yet. But if it can deliver what it says it does, the price to value is just amazing at 130 buck. It blows all the Aixuns out of the water. It looks better too.

author: thm_w
author_rank: Super Contributor
timestamp: November 07, 2023, 12:25:12 am
content: T245 heater resistance is around 2.4 ohms. So you'd get near 60W for that tip at 12V.Good but I don't think it directly competes with the Aixun as they are all about maximum power, claiming 200W capable.But if you are doing microsoldering this seems like a solid value choice. Usually manufacturers charge a large premium for their microsoldering handpieces/tips.

author: mastershake
author_rank: Frequent Contributor
timestamp: November 16, 2023, 08:37:34 am
content: I just went ahead and ordered one ill see how well it does overall compared to the 420d since currently thats my main stations at the moment.

author: ndarjo21
author_rank: Regular Contributor
timestamp: November 17, 2023, 05:42:52 am
content: I am waiting for the review. Also disassemble the unit can be a help for other

author: thelampire
author_rank: Newbie
timestamp: December 26, 2023, 11:46:41 am
content: Any news on this station? Has anyone used this extensively since its release? I am in the market for something similar and don't quite want to build the axxsolder for now (nor is it in this price range).

author: Roehrenonkel
author_rank: Frequent Contributor
timestamp: December 26, 2023, 05:05:00 pm
content: Hi all,for christmas i got myself the GVM H3. It came on time, good packed and complete.The case is a plastic, JBC has a case of aluminium-cast - as far as i can remember.At power-on it tripped the breaker.After a bit of hassle with the seller, i opened the case (four screws from below, one unter the sponge-holder)to find the switch-wires at the sharp edge of the transformer with isolation damaged.IMHO they used the wrong connectors and have no QA/final test.Btw: the transformer looks more like a 35VA than a 70VA.EDIT: size is 66x56x35mm³The connectors of the handpieces don't lock properly./EDITHaven't used it much, only for small stuff.And it's probably only intended for tiny work, when i look at the available tips.JBC has a much broader range there.Conclusion so far: If you get one, check it for leakage-current, or open it right away.Merry christmas,best regards

author: giovannirat
author_rank: Regular Contributor
timestamp: January 30, 2024, 03:35:46 pm
content: I've got a GM H3 too.My impressions so far:+Seems good quality, well manufactured+Works with original JBC tips+ Professional design+ tip earth connected- T245 tip heat time from 20° to 320° is about 9 sec (NOT 2 sec), for 210 and 115 tips around 2 to 4 sec- Sleep temp cannot be adjusted (cools down to 70° and lower)- Humming transformer- small brass wool (you can easily touch the plastic case and damage it)- Useless USB (no firmware, no PC SW available until now, false advertisement!)- 80W transformer questionable (size, power..)- QC doubtful ( had a 110V label on the station case, a 220V label on the package)- BUG: Handle without a tip in the station shows 470° (instead of "sleep" or "no tip")

author: ndarjo21
author_rank: Regular Contributor
timestamp: January 30, 2024, 05:01:54 pm
content: Voltage from tip to earth?

author: Hydrawerk
author_rank: Super Contributor
timestamp: January 30, 2024, 07:39:54 pm
content: Try measuring the power consumption by something like this...

author: Hydrawerk
author_rank: Super Contributor
timestamp: January 30, 2024, 07:41:44 pm
content: In an original JBC station there is probably a 130W transformer...https://www.jbctools.com/cdb-soldering-station-product-1605.html

author: giovannirat
author_rank: Regular Contributor
timestamp: January 30, 2024, 09:11:15 pm
content: Power consumption is around 60W when heating and 5,5W standby (with T245 tip).

author: Hydrawerk
author_rank: Super Contributor
timestamp: January 31, 2024, 10:41:47 pm
content: 60W is rather poor.

author: Hydrawerk
author_rank: Super Contributor
timestamp: January 31, 2024, 10:51:14 pm
content: Quote from: Roehrenonkel on December 26, 2023, 05:05:00 pmJBC stations used to be made of metal. My JBC AM rework stationis is made of aluminium and thick sheet steel. I have it at work.Back in 2017 i had a JBC BD-2BA at my work and i think that it was made of cast aluminium.But today all JBC stations are probably made of plastic.If you want a metal soldering station, you must choose from PACE, probably some of METCAL or Thermaltronics or some of Hakko like FX-838.

author: thm_w
author_rank: Super Contributor
timestamp: January 31, 2024, 11:30:59 pm
content: Quote from: Hydrawerk on January 31, 2024, 10:41:47 pmUnless they do a water test (or equivalent) and confirm its actually capping at 60W, I wouldn't trust the number. If you are just testing random joints, with some random tip, the data is near meaningless. Power up consumption may be valid, usually it would be but who knows some might implement a slow startup.

author: bhgsmservis
author_rank: Newbie
timestamp: February 20, 2024, 03:01:45 pm
content: Any one check is soldering tips grounded?Any voltage on soldering tip ? (tip to ground)

author: giovannirat
author_rank: Regular Contributor
timestamp: February 22, 2024, 05:24:02 pm
content: Soldering tip is groundedNo voltage on soldering tip (to ground)

author: SteveyG
author_rank: Unknown
timestamp: February 25, 2024, 12:14:46 am
content: Didn't seem to reach the claims of 80W.Video (unlisted for now):

author: bhgsmservis
author_rank: Newbie
timestamp: February 29, 2024, 02:21:27 pm
content: @SteveyGNice video

author: Sbranky
author_rank: Newbie
timestamp: March 20, 2024, 10:34:28 am
content: Kudos to Steve for the details in this video, and the subsequent SDG#331, always very detailed.But I think there is something wrong in its configuration, especially in the final assembly. As you can see from his video SDG#329 the Blue and Brown transformer windings are connected on the PCB in a different sequence:photo video SteveOn other videos in circulation, however, you can clearly see that the brown pair (70W) should be the one dedicated to heating the tip, but it is connected on the PCB to the input of the rectifier to obtain the power supply for the circuits, while the Blue pair (from 9W) which should be the one dedicated to the power supply is connected to the central terminal, near the power mosfets, therefore clearly inverted.photos othersThis accounts for the dramatic 8 Volt drop that Steve notes in SDG video #331 when he pulls out the handpiece and overloads the 9W Blue coil.I believe that this station cannot compete with more famous stations on the market with C245 tips, but by connecting it correctly by inverting the outputs from 9W to 70W you should see a big difference and it should work decently. I had the opportunity to try it with c245 and c210 tips and not so bad.In this other test video, at minute 6:57 and above all with a correct configuration of the transformer output pairs, there are three nice tests with C245, C210 and C115 tips:https://youtu.be/6h5jQm4XzFk?t=417

author: thm_w
author_rank: Super Contributor
timestamp: March 20, 2024, 10:03:06 pm
content: Quote from: Sbranky on March 20, 2024, 10:34:28 amThat is still slow heating up time for a T245, 7 or 8 seconds. But, that could just be PID loop settings so may be a non-issue for normal soldering.

author: Sbranky
author_rank: Newbie
timestamp: March 21, 2024, 09:02:03 pm
content: Quote from: thm_w on March 20, 2024, 10:03:06 pmI don't think it's the PID loop that introduces that delay, because with the C210 and C115 irons the times are the usual ones. However, I suspect that this is a compromise if you want to create a station that supports the three handpieces while having a single 13 Volt power supply for all of them.Surely the C245 is the one that suffers the most in the heating phase with only 13 Volts, if it were powered by 24 Volts like a Jabe or an Aixun the rise would be much quicker, but with 13V this is the price to pay with that transformer 70 W which, during the welding phase, is sufficient for most jobs.We are still talking about a $140 station, which I repeat is not bad

author: thm_w
author_rank: Super Contributor
timestamp: March 21, 2024, 09:41:07 pm
content: Yeah I forgot its limited to 13V, so ~60-70W max at 2.5 ohm.Though nothing stops you from using 18-24V and then capping the duty cycle for the smaller tip sizes (C210, C115). You'd probably want to rectify so you can chop at a higher frequency, cost can go up.There is that WEMON station that might be doing this, slightly cheaper:https://www.aliexpress.com/item/1005006386362331.htmlLooks the same on the inside?

author: nokin
author_rank: Regular Contributor
timestamp: September 27, 2024, 08:54:32 am
content: hi all,Long time to come back to this topicI want to change or add a new transformer / switching power from 12VAC original to 24VAC/DC to use only C245 tips for maximize heating power ? Is this safe ?thanks !

author: thm_w
author_rank: Super Contributor
timestamp: September 27, 2024, 09:00:44 pm
content: Quote from: nokin on September 27, 2024, 08:54:32 amYou'd have to:- Reverse engineer the circuit- Check all parts are able to withstand 24V (or 34V peak DC)There is a FET P40T13, 40V:https://www.lcsc.com/datasheet/lcsc_datasheet_1810010334_Wuxi-NCE-Power-Semiconductor-NCEP40T13GU_C191993.pdfBut there is also a current sensing IC:https://www.lcsc.com/product-detail/Current-Sensors_Cross-chip-CC6903SO-20A_C469387.htmlSo who knows how the internal code is written, if it will shut down the output when you feed in higher voltage or not?You might test with 24V DC first with a power supply (once you determine its safe). But I don't think its worth your time.Save this station for C210/115 and get another for 245.