Desktop power supply (Mastech-TRIPLE-LINEAR-SUPPLY-HY3005F-3) - Page 1
Forum section: electronics / general

author: mrwebb
author_rank: Contributor
timestamp: July 03, 2012, 03:13:52 pm
content: Hey there, I've been trying to decide if I should get a desktop power supply. I found one at amazon that looks pretty nice. Can any of you pros offer any feedback on this thing? Pretty solid deal?http://www.amazon.com/Mastech-TRIPLE-LINEAR-SUPPLY-HY3005F-3/dp/B004ISD7T6/ref=pd_rhf_gw_p_t_3

author: zaoka
author_rank: Frequent Contributor
timestamp: July 03, 2012, 06:38:17 pm
content: I have the same one, with analog meters, its very good quality equipment.

author: saturation
author_rank: Super Contributor
timestamp: July 03, 2012, 07:05:41 pm
content: The true Mastech supplies are good units, not the cheapest though. You can find teardowns of some models in the archives.Its hard to say if its a "real" Mastech or a clone of Mastech when you buy from anyone but the US importer of Mastech. You may want to compare s/h costs from their site directly.http://www.mastechpowersupply.com/Its always better to buy through Amazon for protection and short term product guarantee.If you order directly, confirm everything with Sean via email first, before putting an order in via the web. The site, is good for pics, but the stock listing may not be accurate, but offers far more models than most advertise.

author: StubbornGreek
author_rank: Frequent Contributor
timestamp: July 03, 2012, 07:16:36 pm
content: I have that one and I feel its built well enough. It offers three outputs with max of 60V or 10A for only ~$200...

author: mrwebb
author_rank: Contributor
timestamp: July 06, 2012, 09:29:50 am
content: Quote from: StubbornGreek on July 03, 2012, 07:16:36 pmThanks man, I ordered one, it is on its way!

author: StubbornGreek
author_rank: Frequent Contributor
timestamp: July 06, 2012, 02:26:43 pm
content: Quote from: mrwebb on July 06, 2012, 09:29:50 amGreat, let us know how you like it.

author: mrwebb
author_rank: Contributor
timestamp: July 09, 2012, 11:58:32 pm
content: @stubborngeek, unit arrived and I'm still playing around with it. Seem well built enough, but there is one pretty fundamental misconception I had and wanted to ask someone a little more familiar than I am with this stuff.I am a total newb so sorry if this is a dumb question: I thought that with a benchtop power supply I would be able to set the Voltage AND Current and get power at those given settings? It seems as though this is not possible with the mastech. They allow me to be in either Constant Current mode or Constant Voltage mode, but not both. So basically I can turn up the voltage to say 18v but cannot adjust the current, or move the current to 750mA but not adjust the voltage. But I cant tell it to do 18v at 750mA, somehow this seems like a pretty big problem?The manual is painfully simple and doesnt really cover things too in depth., refers to buttons I dont have, etc.Is it just a case where I should not need to ever set both current/voltage? Are there other reasons I dont need to do it? Any help would be wonderful, I am still within the return timeframe so if I need to get a different model or something then now would be the time to do it.Thanks guys.

author: OndraSter
author_rank: Contributor
timestamp: July 10, 2012, 12:11:26 am
content: It is power supply, not load!May I ask how would you tune voltage AND amps? Would some kind of hand come out from the supply and slide potentiometer?Ohm's law applies:I = U/RU is constant (what you set)R is constant (the circuit)You are setting the maximum current that can flow - if the current AT given voltage should be higher, the power supply goes to constant current mode and starts lowering the voltage to limit the maximum set current!

author: mrwebb
author_rank: Contributor
timestamp: July 10, 2012, 12:19:35 am
content: OK I feel kinda dumb right about nowThanks for being patient, I'll get this stuff yet! Makes sense now. Sure I'll be back with some more gems for your amusement before long

author: mrwebb
author_rank: Contributor
timestamp: July 10, 2012, 10:32:28 pm
content: Hey Guys, One more dumb question if you dont mindI am familiar with the red and black leads, but what is the green one used for? Most of the devices I might power with this seem to only have positive and negative. Can you give me an idea where green might be useful?

author: T4P
author_rank: Super Contributor
timestamp: July 11, 2012, 01:37:22 am
content: Quote from: mrwebb on July 10, 2012, 10:32:28 pmReference to earth

author: StubbornGreek
author_rank: Frequent Contributor
timestamp: July 11, 2012, 05:25:39 am
content: How is this coming along? What have you done with your supply so far?

author: icon
author_rank: Regular Contributor
timestamp: July 11, 2012, 06:59:05 am
content: Quote from: DaveXRT on July 11, 2012, 01:37:22 amFor an expanded answer, seehttps://www.eevblog.com/forum/beginners/what's-the-'ground'-terminal-for-on-all-these-dc-power-suppliesJohn