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Re: Board tester power supply? [Re: Trumpy] #218746
09/14/17 12:23 AM
09/14/17 12:23 AM
J
JoeTestingEngr  Offline
Member
Joined: Nov 2005
Posts: 799
Chicago, Il.
Trumpy,
I'm really glad that I was able to help. If you want to keep the size and weight down, please consider an R/C Li-Po battery and charger, as your power source. It's hard to beat their energy density. You can feed your boost converter with the output connector, and use the balancing connector for recharging. A 3S or 4S, 2200mAHr Li-Po would power your tester for several hours continuously. The "T-Plug" in the example is called a "Deans Connector". Other common connectors are called EC-3, and XT-60. I think that they all can handle around 60A, so no issue there. The balancing connectors, that fit into the chargers, are JST XH connectors. Looking forward to seeing pics of your prototype.
Joe
http://www.ebay.com/itm/Professinal-HPB-11-1V-2200mAh-25C-MAX-35C-3S-T-Plug-Lipo-Battery-For-RC-Airplane-/381885651892?epid=21003903922&hash=item58ea289bb4:g:ozEAAOSwQTVV76-P

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Re: Board tester power supply? [Re: Trumpy] #219701
10/10/18 07:49 PM
10/10/18 07:49 PM
J
JoeTestingEngr  Offline
Member
Joined: Nov 2005
Posts: 799
Chicago, Il.
Trumpy,
How did your boost switcher supply work out?
Joe

Re: Board tester power supply? [Re: Trumpy] #219703
10/12/18 05:45 PM
10/12/18 05:45 PM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,253
SI,New Zealand
Gidday Joe,
Sorry I had completely forgotten about this thread, until your reply.

I finally found time to built up a prototype about 6 or so months ago, over a wet weekend here and took it to work and demonstrated it to my boss and the service technicians.
The first question I was asked was "Ohh, where did you buy that from?" laugh
By this stage, it didn't look anything like I had originally planned it to, with small improvements and a couple of extra features added in.
I've since made 4 other of these units, so now everyone has one, apart from me.
I will grab one at work on Monday and get some pictures, I should have done this when I was building them but the thought never occurred to me.

That boost converter worked phenomenally well, considering it cost so little, which shows how far we've come,
I remember a time when anything "special" like this device would have cost you an arm and a leg.
I bought ten of them when I made the other 4 units and I had one on my bench here, I loaded it up as much as I could and thought it would overheat without a heatsink on the chip, but no, the voltage never faltered either.
So it was good news all round.

Re: Board tester power supply? [Re: Trumpy] #219706
10/12/18 11:14 PM
10/12/18 11:14 PM
J
JoeTestingEngr  Offline
Member
Joined: Nov 2005
Posts: 799
Chicago, Il.
Great news Trumpy! I've made quite a few pieces of test equipment that the guys at work enjoy using. Not a one of them ever thought that what I made was store bought. Even without pictures, I know your craftsmanship must be exceptional. I can't wait to see pics though. I'm curious if you chose LiPo batteries or some other high energy density source.

I suspected that you would probably get good results with those little boost switchers. I know that if you priced out just a few of the components, you saw that you couldn't build one, without spending several times what you paid.

Did you end up writing a manual for your tester? I love to design/build things but hate writing the manuals. My last gadget was a 19 Cycle Timer / Current Source for ballistic relays. The manual was 6 pages, including descriptions, photos, schematic, and layout drawing. The only fun part was watching the guy's faces, as they were reading the circuit descriptions.
Joe

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