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Old 04-16-2007, 06:49 AM   #1
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Default DIY Discharge tray

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


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

Cheers,

Ben
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Old 04-16-2007, 07:44 AM   #2
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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
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Old 04-16-2007, 08:10 AM   #3
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Hrm any ways around that? different diode or resistor maybe?
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Old 04-16-2007, 09:49 AM   #4
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Quote:
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...
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Last edited by Pat Clark; 04-16-2007 at 12:23 PM.
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Old 04-16-2007, 10:51 AM   #5
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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?
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Old 04-16-2007, 10:53 AM   #6
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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.
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Old 04-17-2007, 07:41 AM   #7
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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.
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