Go Back  R/C Tech Forums > General Forums > Electric On-Road
Weird power supply problem >

Weird power supply problem

Weird power supply problem

Reply

Old 07-28-2004, 10:00 PM
  #1  
Tech Master
Thread Starter
 
Join Date: Aug 2003
Location: San Diego
Posts: 1,355
Default Weird power supply problem

Okay, I've run into an unusual problem with my power supply/charger. When I go to charge batteries, I always get an Input Voltage error, because the charger is getting around 19v from the ps, even though the ps is only rated at 13.8v. So, I checked the charger by running it off my van's battery and it worked fine, so the problem seems to be in the ps itself. One thing: I had left the power supply plugged into the outlet (but not turned on) for over a week, if that would make a difference.
Pleaes let me know what's going on!
Thanks.
micros_rock is offline  
Reply With Quote
Old 07-28-2004, 10:15 PM
  #2  
Tech Elite
iTrader: (6)
 
EddieO's Avatar
 
Join Date: Oct 2003
Posts: 3,415
Trader Rating: 6 (100%+)
Default

Lots of chargers will freak out if they get more than 15v.....see if the power supply has an adjustment knob to turn the the voltage down.....not sure what type of PS you have.

Later EddieO
EddieO is offline  
Reply With Quote
Old 07-28-2004, 10:17 PM
  #3  
Tech Master
Thread Starter
 
Join Date: Aug 2003
Location: San Diego
Posts: 1,355
Default

I have a Pyramid 10A power supply. It doesn't have a dial, the label says 13.8v for the voltage. The funny thing is that it worked fine before, but after I left it plugged in for a week, I have this problem now.
micros_rock is offline  
Reply With Quote
Old 07-28-2004, 10:52 PM
  #4  
Tech Elite
iTrader: (6)
 
EddieO's Avatar
 
Join Date: Oct 2003
Posts: 3,415
Trader Rating: 6 (100%+)
Default

Sounds like something is shorted out that controls the voltage....

My advice, discontinue using it immediately.

Go onto ebay and buy one of the Elco power supplies for $20....then buy a $5 cord from Home Depot to wire it up. You will have a $100 power supply for about $30.

There is a thread on these forums from a while back that tells you how to wire everything up......pretty easy, I just did one up today in about 10 minutes.

Later EddieO
EddieO is offline  
Reply With Quote
Old 07-28-2004, 11:43 PM
  #5  
Tech Regular
 
Raynor's Avatar
 
Join Date: Jul 2003
Location: My Idol!
Posts: 318
Default

Mic, You got so lucky that your charger is still working. I see Pyramid charger is only a linear type P.S., some linear PS does'nt have any protection like those in Switched Mode type PS.
Raynor is offline  
Reply With Quote
Old 07-28-2004, 11:45 PM
  #6  
Tech Master
Thread Starter
 
Join Date: Aug 2003
Location: San Diego
Posts: 1,355
Default

So, just trash the ps? Or can I mess with the insides?
micros_rock is offline  
Reply With Quote
Old 07-28-2004, 11:53 PM
  #7  
Tech Regular
 
Raynor's Avatar
 
Join Date: Jul 2003
Location: My Idol!
Posts: 318
Default

If you know anything about electronics why not? It can save you some money if you can repair it by yourself. Better to install a crowbar circuit at the output side of the PS.
Raynor is offline  
Reply With Quote
Old 07-28-2004, 11:56 PM
  #8  
Tech Master
Thread Starter
 
Join Date: Aug 2003
Location: San Diego
Posts: 1,355
Default

Ok, I'll do that just for the hell of it.
BTW- how's this ps: http://www.radioshack.com/product.as...ct%5Fid=22-506
micros_rock is offline  
Reply With Quote
Old 07-29-2004, 12:06 AM
  #9  
Tech Master
 
DOMOisCOOL's Avatar
 
Join Date: May 2003
Location: Daly City, California, U.S.A.
Posts: 1,914
Default

I have one of those. They work great. I've had it for a year (always plugged in). Still have it. By the way, don't get it from the store. Get it from eBay. WAAAY cheaper!

P.S. I have one for sale.

However, I think they're based off the Pyramid Power Supplies, or vice versa.
DOMOisCOOL is offline  
Reply With Quote
Old 07-29-2004, 12:20 AM
  #10  
Tech Regular
 
Raynor's Avatar
 
Join Date: Jul 2003
Location: My Idol!
Posts: 318
Default

It does'nt have an output OVP circuit, still risky.
Raynor is offline  
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Terms of Service