Author Topic: Second Bench Power Supply Search  (Read 6654 times)

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Offline WarSim

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Second Bench Power Supply Search
« on: July 16, 2013, 05:02:13 am »
I have seen may bench power supply help threads but only for standard ranges. 

Currently I have a Tenma 72-6905 it isn't great but good enough. 
I pre-regulate anything important. 
So you don't have to look it up it is. 8-15 1A, 2.2-5.2 1A, +-0-30 0-3A all isolated. 
I like it because it has series, parallel and isolated switchs.

What I am missing is something that can give me 150v .5A. 
My actual requirements are 140v but I like to leave headroom for pre-regulation when required. 
I can make over 150v by chaining almost all my power supplies but i'd rather not.
Ideally I something like think a +-75v 0-1A would be my most adaptable solution. 
Other selling points Compact (small bench) and 115 60Hz (Canada)

Here is the problem I have slogged through hundreds of power supply specs looking for my best option. 
I have found that most sites do not advertise the voltages and I end up at the standard 0-30v supplies. 
For this reason the only supply I any real info in is a B&K power supply for $800ish. 
I am thinking there must be other viable options out there, for under $500.
Before I give up and make one I want to ask everyone if they know of any other options for me to look at. 
 

Offline PedroDaGr8

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Re: Second Bench Power Supply Search
« Reply #1 on: July 16, 2013, 05:12:12 am »
I have seen may bench power supply help threads but only for standard ranges. 

Currently I have a Tenma 72-6905 it isn't great but good enough. 
I pre-regulate anything important. 
So you don't have to look it up it is. 8-15 1A, 2.2-5.2 1A, +-0-30 0-3A all isolated. 
I like it because it has series, parallel and isolated switchs.

What I am missing is something that can give me 150v .5A. 
My actual requirements are 140v but I like to leave headroom for pre-regulation when required. 
I can make over 150v by chaining almost all my power supplies but i'd rather not.
Ideally I something like think a +-75v 0-1A would be my most adaptable solution. 
Other selling points Compact (small bench) and 115 60Hz (Canada)

Here is the problem I have slogged through hundreds of power supply specs looking for my best option. 
I have found that most sites do not advertise the voltages and I end up at the standard 0-30v supplies. 
For this reason the only supply I any real info in is a B&K power supply for $800ish. 
I am thinking there must be other viable options out there, for under $500.
Before I give up and make one I want to ask everyone if they know of any other options for me to look at.

You didn't mention if you mind used or not. Personally, with PS I think used is the way to go. You get the best bang for the buck. If you don't mind used the HP 6827A should fit your bill. +/- 100V (it actually functions as both a dual power supply and as a high power op-amp, kinda cool). They go for under $500 on ebay. Also, testequipmentdepot has a good search ability (you can browse models and easily see their max ratings) see here for an example
The very existence of flamethrowers proves that some time, somewhere, someone said to themselves, "You know, I want to set those people over there on fire, but I'm just not close enough to get the job done." -George Carlin
 

Offline WarSim

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Second Bench Power Supply Search
« Reply #2 on: July 16, 2013, 05:43:21 am »
A good used is fine, but usually old is bigger. 
Only thing giving me pause is work recently got rid of a load of that exact model due to intermittent issues. 
Hopefully not the same ones.
« Last Edit: July 16, 2013, 05:45:51 am by WarSim »
 

Offline WarSim

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Second Bench Power Supply Search
« Reply #3 on: July 16, 2013, 05:46:47 am »
I just think under $500 new should be possible for what I am looking for.
Defiantly on the list.
Sorry the forum would not include this half on he previous post for some reason?
 

Offline jpb

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Re: Second Bench Power Supply Search
« Reply #4 on: July 16, 2013, 06:01:05 pm »
The trouble with power supplies is they are heavy to ship.

In the UK TTi do good supplies, for instance:

http://www.tti-test.com/products-tti/psu/ex752m.htm

which can do 0 to 150V at up to 2A.

They also do the PLH250 which goes to 250V but unfortunately only 375mA.
 

Offline WarSim

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Second Bench Power Supply Search
« Reply #5 on: July 17, 2013, 12:21:13 am »
I found a TTI source in Canada but getting a price out of them is like pulling hens teeth. 
I gave up on them the first time around. 
The power supply is for my hobby not a company. 
Their site keeps failing choking on the relevant info. 

I'll try one more time. 
Do you have a cost in your area?
 

Offline WarSim

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Second Bench Power Supply Search
« Reply #6 on: July 17, 2013, 12:27:48 am »
I found the price list it is almost $800.00 like the BK precision.  :(
 

Offline Bryan

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Re: Second Bench Power Supply Search
« Reply #7 on: July 17, 2013, 01:50:30 am »
Keep an eye on Ebay there is often good used supplies available, some come to mind are the Tektronix PS280. very reliable, easy to fix and will last a lifetime. You can easily pick one up for $200.00. A lot of the older supplies are linear, heavy, but built to least.
-=Bryan=-
 

Offline WarSim

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Second Bench Power Supply Search
« Reply #8 on: July 17, 2013, 03:29:58 am »
If you happen upon a tek part number that has what I am looking for I would like to hear of it. 
Certainly the PS280 dose not meet my requirements, according to it's datasheet online at Tek. 
 

Offline KJDS

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Re: Second Bench Power Supply Search
« Reply #9 on: July 17, 2013, 07:52:46 am »

Offline cosmos

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Re: Second Bench Power Supply Search
« Reply #10 on: July 17, 2013, 08:17:36 am »
If you want new gear then maybe this one fits the bill?
http://www.maynuo.com/english/pro.asp?tid=34

Aliexpress price (not your local vendor price ofc), Maynuo offered to sell me directly too, you could mail them and ask.
http://www.aliexpress.com/item/Brand-New-M8813-Programmable-DC-Power-Supply-Meter-Tester-0-150V-0-1A-150W/859880975.html

See the maynuo m8811 discussion here for some feedback on the same family:
https://www.eevblog.com/forum/testgear/maynuo-m8811inside-pic
 

Offline iloveelectronics

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Re: Second Bench Power Supply Search
« Reply #11 on: July 17, 2013, 09:41:34 am »
Martin briefly talked about the Maynuo M8813 in the following video at about 19:00. He will probably do a full review soon.



It does 0-150V, up to 1A.
My email address: franky @ 99centHobbies . com
My eBay store: http://stores.ebay.com/99centhobbies
 

Offline WarSim

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Second Bench Power Supply Search
« Reply #12 on: July 18, 2013, 03:57:11 am »
If you want new gear then maybe this one fits the bill?
http://www.maynuo.com/english/pro.asp?tid=34

Aliexpress price (not your local vendor price ofc), Maynuo offered to sell me directly too, you could mail them and ask.
http://www.aliexpress.com/item/Brand-New-M8813-Programmable-DC-Power-Supply-Meter-Tester-0-150V-0-1A-150W/859880975.html

See the maynuo m8811 discussion here for some feedback on the same family:
https://www.eevblog.com/forum/testgear/maynuo-m8811inside-pic

I have read all the info but this one looks promising, but the price is still over $700. 
I seem to be collecting a list of $700-$900 power supplies.
I am still hoping for under $500 but things are not looking good, so far.

BTW an exchange calculator says $500.00 CDN = 316£.
 

Offline olsenn

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Re: Second Bench Power Supply Search
« Reply #13 on: July 18, 2013, 04:37:41 pm »
You can always connect isoated power supplies/channels in series to superimpose those voltages. I just received my Rigol DP832 and so far I am very happy with it. I also own a GW-Instek GPS-4303 and it works a treat also.
 

Offline WarSim

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Second Bench Power Supply Search
« Reply #14 on: July 18, 2013, 08:12:44 pm »
You can always connect isoated power supplies/channels in series to superimpose those voltages. I just received my Rigol DP832 and so far I am very happy with it. I also own a GW-Instek GPS-4303 and it works a treat also.

Yes this is one of the options I am considering. 

Eg If I get a second matching my first I could get 140v and +-5v in a awkward way. 
If I have three total I the awkwardness would be resolved, and would still cost slightly less. 
Just allot of jumpers. 
 

Offline Bryan

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Re: Second Bench Power Supply Search
« Reply #15 on: July 20, 2013, 01:35:51 am »
If you happen upon a tek part number that has what I am looking for I would like to hear of it. 
Certainly the PS280 dose not meet my requirements, according to it's datasheet online at Tek.

Oops, sorry , should have read the post more closely. At that voltage wonder if it would be cheaper o regulate the output of a isolation transformer. With a full bridge and caps you are not that far off.
-=Bryan=-
 

Offline WarSim

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Second Bench Power Supply Search
« Reply #16 on: July 20, 2013, 05:28:17 am »
Yes, it seems my expectations are going to be unfulfilled. 

Given this revelation I am also considering the DIY option. 
 

Offline jpb

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Re: Second Bench Power Supply Search
« Reply #17 on: July 20, 2013, 08:20:11 am »
I found the price list it is almost $800.00 like the BK precision.  :(

Sorry, just seen your post. The list prices for TTi are quite high - not as high as Tek or Agilent but above Chinese imports.

I bought my TTi PL320QMD from

http://www.test-measure.co.uk/

it was brand new with 90 day warranty and shipped direct from TTi but only cost me £160 as it was an old model. It is worth contacting Steve Hodge at test-measure as he may have something that fits your needs at a good price. The shipping would be expensive but there might be cheaper options such as parcel post. It is unfortunate that power supplies weigh so much. TTi supplies, especially the older ones, are massively over-specced and built to last. The other thing to add is Steve is open to offers.

Having said all that, I couldn't see a supply that meets your needs in the current list but if you contact him he may have something that he has not listed yet.
 


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