Go Back  R/C Tech Forums > General Forums > Electric On-Road
DIY Discharge tray >

DIY Discharge tray

DIY Discharge tray

Old 04-16-2007, 06:49 AM
  #1  
Tech Adept
Thread Starter
iTrader: (1)
 
Phroz's Avatar
 
Join Date: Jan 2007
Posts: 159
Trader Rating: 1 (100%+)
Default DIY Discharge tray

Found this.. does anyone think this would actualy work?


http://homepage.ntlworld.com/terry.c...l/distray.html

Cheers,

Ben
Phroz is offline  
Old 04-16-2007, 07:44 AM
  #2  
Tech Apprentice
 
Join Date: Sep 2006
Location: FINLAND, EUROPE
Posts: 54
Default

Yes sure it works!

I have built two trays like these (did not copy intructions from that site) and they do their job well, but thing which should be noticed is that cut-off voltage is fixed due to technology to 0.7 volts and by my knowledge for example with IB4200-cells the voltage should NEVER be dropped under 0.9V/cell.

Tommi
TommyW is offline  
Old 04-16-2007, 08:10 AM
  #3  
Tech Adept
Thread Starter
iTrader: (1)
 
Phroz's Avatar
 
Join Date: Jan 2007
Posts: 159
Trader Rating: 1 (100%+)
Default

Hrm any ways around that? different diode or resistor maybe?
Phroz is offline  
Old 04-16-2007, 09:49 AM
  #4  
Tech Regular
 
Pat Clark's Avatar
 
Join Date: Aug 2005
Location: Easton, Pa
Posts: 303
Default

Originally Posted by Phroz
Hrm any ways around that? different diode or resistor maybe?

Nope.. From what Im told there isnt any Diodes out there that cutoff at anything different... The Resistor is just the load...

Last edited by Pat Clark; 04-16-2007 at 12:23 PM.
Pat Clark is offline  
Old 04-16-2007, 10:51 AM
  #5  
Tech Addict
iTrader: (1)
 
Iceracer's Avatar
 
Join Date: Feb 2006
Location: Canada
Posts: 656
Trader Rating: 1 (100%+)
Default

You'd need to find a diode with a higher forward voltage drop, say 0.9 or 1.0 volts. Pour over the spec sheets and you may find one, whether its cost effective is another question. You might even be able to find some bulk rectifiers that are in the right ballpark and test and match them, but is it worth your time?
Iceracer is offline  
Old 04-16-2007, 10:53 AM
  #6  
Tech Apprentice
 
Join Date: Sep 2006
Location: FINLAND, EUROPE
Posts: 54
Default

It is just the diode which controls whether a single cell is being discharged in this kind of tray.

The control-mechanism is very simple: diode has a so called 'threshold voltage' (is 'gate' open or closed) - in normal diode this voltage is around 0.7V. When the voltage of single cell drops under 0.7V - diode does not let the current go through anymore and discharging is stopped.

Tommi.
TommyW is offline  
Old 04-17-2007, 07:41 AM
  #7  
Tech Adept
Thread Starter
iTrader: (1)
 
Phroz's Avatar
 
Join Date: Jan 2007
Posts: 159
Trader Rating: 1 (100%+)
Default

Ah ok makes sense.. have to have a hunt for diodes and see what i can find.. as far as worth the time? well half the fun is the project itself and making something that works from scratch... ah.. the good ol' days of rc lol

Thanks for the input guys!

Ben.
Phroz is offline  

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 - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.