"3D" Ignition Drop Down Diode for A123's - RC Groups
Thread Tools
This thread is privately moderated by Jonathan Ott, who may elect to delete unwanted replies.
Oct 07, 2012, 03:14 PM
Trader Rating: 95
Will fly for food.
Jonathan Ott's Avatar
For Sale

"3D" Ignition Drop Down Diode for A123's


"3D" Ignition Drop Down Diode for A123's.

These are virtually the same as available from several mail order vendors. I just made a bunch of these up and will pass the savings to you!!!

For use with A123 batteries, these will drop the voltage to your ignition module by about 1.3vdc.

Please see the pics:

1. A set of diode rigs, ready to go!

2. My test battery (EP Buddy 2300 mAh LiFe)

3. Battery voltage (6.97vdc. It had already been running the cooling fan for a few minutes prior to this picture)

4. Voltage showing on my cooling fan (6.92vdc)

5. Voltage at the fan through the "3D" Drop Down Diode (5.37vdc (it was bouncing between 5.37 and 5.38vdc))

Approximately a 1.55vdc drop!

This little rig will give you about a 1.3 - 1.5vdc drop that could save your ignition module from dying from an over voltage situation (remember, your A123 will show over 7vdc directly off the charger...).

These go for close to $8, plus shipping from many on-line retailers. Get 'em from me for $6.50 each, with free shipping!!! Quanity discounts available (5+ units).
Sign up now
to remove ads between posts
Oct 07, 2012, 04:48 PM
Trader Rating: 141
Registered User

voltage drop


What Amps the diode can take ?
Thanks
Oct 07, 2012, 05:45 PM
Trader Rating: 95
Will fly for food.
Jonathan Ott's Avatar
These are made with standard 1N4002 diodes (they have the "Motorla" 'M' on them) and from what data I can find on the web, the 1N4002 diodes are 1000v, 1A forward current, but can take 30A surge current.

RCExcel ignitions, for example, from what I've read, use only about 650mAh when running.

Jon
Last edited by Jonathan Ott; Oct 07, 2012 at 06:21 PM. Reason: spelling
Oct 07, 2012, 07:23 PM
Trader Rating: 141
Registered User
Do you beleve 1 amp is enough?
Oct 07, 2012, 08:45 PM
Trader Rating: 95
Will fly for food.
Jonathan Ott's Avatar
There are two diodes in series on these rigs, for 2 amps. I guess I could have explained that up front.

Jon
Oct 07, 2012, 10:16 PM
Trader Rating: 7
FPV Crash Dummy
igorp's Avatar
series doesn't add on current, same current will pass through both of them.
Oct 07, 2012, 11:22 PM
Trader Rating: 160
ProBro, 3D
gregory.da's Avatar
Quote:
Originally Posted by philfun
Do you beleve 1 amp is enough?
They work, I've been using this setup on 30cc DLE's for a few years now..... or you can spend $30 on a switching regulator.
Oct 08, 2012, 01:13 PM
Trader Rating: 95
Will fly for food.
Jonathan Ott's Avatar
Quote:
Originally Posted by igorp
series doesn't add on current, same current will pass through both of them.
Thanks. Either way, 1A continuous, 30A surge. They will work perfect for our applications.

Jon
Oct 08, 2012, 07:02 PM
Trader Rating: 2
Registered User
i have been using four of these that i bought off John,with no problems at all.i use them for ignition off a123 battery.
Oct 09, 2012, 09:59 AM
Trader Rating: 160
ProBro, 3D
gregory.da's Avatar
PM sent
Oct 10, 2012, 02:38 PM
Trader Rating: 95
Will fly for food.
Jonathan Ott's Avatar
Quote:
Originally Posted by gregory.da
PM sent
Got it. It'll go out tomorrow.

Jon
Oct 13, 2012, 11:05 AM
Trader Rating: 95
Will fly for food.
Jonathan Ott's Avatar
Bump
Oct 16, 2012, 08:37 AM
Trader Rating: 95
Will fly for food.
Jonathan Ott's Avatar
These are selling great. Get a couple now for your winter projects and those of you that are thinking about upgrading your batteries.

Only 20 left!

Jon
Oct 29, 2012, 06:25 PM
Trader Rating: 0
Registered User
Hi Jon
I need 5 of these Please let me know Paypal info so I can send money...
Thanks Bruce Bresky
Oct 30, 2012, 05:00 PM
Trader Rating: 95
Will fly for food.
Jonathan Ott's Avatar
Bruce, I just sent you a PM.

Thanks!

Jon

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion A123 Rx pack..... add diodes????? SteveM Batteries and Chargers 20 Jun 26, 2012 09:22 AM
Question Silicon "dropping diode" choice for 2S1P LiFePO4 Rx airborne packs?? The PIPE Radios 22 Oct 06, 2011 01:11 PM
Discussion Zener diodes for spike suppression on A123 Rx packs? stumax DIY Electronics 6 Jun 23, 2010 08:21 PM
Discussion Replacement diode for Align 5.1 step down khaoz Electric Heli Talk 3 Aug 30, 2008 07:24 PM
Zener Diode to Drop 3xQ830 li-Ion Voltage for Tiger Moth AndrewsJr Power Systems 2 Feb 24, 2002 11:04 PM