The controller is like a wolf in sheep's skin because it is under tuned in order to optimize for long range. There are lots of potential and features you can unveil and twist as you go. You can program functions such as enable power regeneration, regenerate braking, pulse width modulation, low voltage cut-off, interface with a Cycle Analyst, and others. You may also add an USB to TTL adapter and connect to the computer for tuning. (Electronics knowledge is required to unleash the potential however)
One unique feature of this controller is that it has an additional speed sensor circuitry built-in with an extra blue wire for output. It is to be used with the scooter style electric bike and electric scooters that have a speedometer in the dashboard. As of April 13th, 2010 the speed sensor wire has been embedded and integrated with the green wire on the CA connector since they both can share the same function now. More practical and less confusion as suggested by previous buyers.

If you look carefully in the photos, you will notice this version also uses lock washers to secure the FETs internally and the heat transfer bar outside to place tension against a nut after tightening. It is also to help prevent the nut from loosening. The FETs will get overheated and damaged when detached from the heat-sink which used to be the case from the previous designs.
* For the extremists, this controller is meant for for easy modification without replacing the MOSFETs to IRFB4110 since it is already equipped. You may double and possibly triple the current output to make it a mighty wonder by adding braids wires (https://www.radioshack.com/products/des ... 5717857861), and add solders to beef up the circuit board traces and shunt.
However, if you are going to use a 9C (Nine Continent) motor, It is recommended to maximize the current output at 65A due to the thinner gauge wires being used with the hub motor. There is a potential that any current & voltage combination higher than the current 72V @ 65A will melt the phase wires in the hub motor and cause potential damage.
The size for the 12 FET controller is as follow. The end to end is 180mm with the mounting plate. Case end to end is 154mm with screws sticking out on each side. The height & width is same as the 18 FET one at 87 x 45mm.
Below is the specification:
Model: EC-124110-LYEN EDITION
Start immediate controller
Chipset: XCKJ8B116A (same chipset being used as in the 18 FET controller)
Circuit board version: EB812XC-A-B
12 x genuine IRFB 4110 MOSFET N-CH 100V (tested up to 110V before damage) for more information about the FET, click the link below:
http://search.digikey.com/scripts/DkSea ... 4110PBF-ND)
72V battery optimized (for higher or lower voltage & current such as 24V-100V, you may need to change the resistor network to avoid damage to the LM317 linear voltage regulator)
45A is the current rate (for higher current, you may need to beef up the trace, shunt, and reprogram it via the software)
Low voltage cut-off: 62.5v
Battery and motor phase wires gauge size: 12AWG (High voltage capable wires equipped)
Dimension: 6.2" x 3.4" x 1.75" (155mm x 87mm x 45mm) plus mount extensions
Total weight: 515 gram
I have only 85 made since I am busy working on my other ebike projects. My intention for selling at such low price is to share the fun with other ES forum members instead of making them jealous.


$129 USD free ground shipping in the United States & Canada. For other locations, please PM or email me at LYEN@HOTMAIL.COM. I accept PayPal, cash or money order. The controllers will be shipped out from me in San Francisco, California, USA. I will provide a tracking number and ship it out as soon as I have received the fund.
For only $10 more, I can include the following:
1. CA connector
2. Regenerative enable/disable (Enabled simply by connect the wires together without the need to open the case)
3. USB-TTL 5 pin connector (for use with the USB-TTL adapter that is sold separate)
I also have the USB-TTL adapter for adjust and alter the controller settings on your computer. It has the extra 5 pin plug and a "SEND" button. It is also compatible with Windows XP/Vista/7/8/10 32/64 bit operating system (real 32/64bit drivers). $15 with purchase, $20 if purchased separately.
You may click on the PayPal Buy It Now link below. For accessories, please send money via PayPal or send me a private message for the total price. Thanks!
https://www.paypal.com/cgi-bin/webscr?c ... Y2YNCWHLXG
If you are not satisfy with the results or if it is too fast for you, you may send it back to me within 30 days in an unmodified condition.
Update: December 1st, 2018 > I can adjust the controller for 24V, 33V, 36V, 48V, 60V, 66V, 72V, 84V, 96V and other battery settings upon request.
As for the maximum testified and successful current. Below are the buyers that can tell you the truth.

Sent: Tue Mar 30, 2010 6:55 pm
by cord
Lyen,
I just wanted to let you know that I soldered the shunt and took the bike out for a
spin with the battery at 96v. I was seeing 85A during acceleration and my peak amps read 147A! This was on a stand alone CA. The controller wasn't even warm, but the 9C was! I promise I'll try not to blow up your controller, thanks again!
-Cord
Sent: Tue Mar 30, 2010 9:54 am
by TMaster
Hey Lyen Lyen! Controller is working excellent! I was thinking of looping the Regen loop wire onto a swtich, so I could manually turn the regen off and on, on the bike. What EBSlimvoltage should it be set at for a 72.6V pack? ALso I have my LVC at 52v. Let me know thanks man! The BIKE IS AWESOME!!! I passed a truck yesterday, and I had a nice tail wind and got up to 44mph on the strait. LOL. 95 amps.
Also, please see the review and technical upgraded detail information from TMaster below:
http://endless-sphere.com/forums/viewto ... =2&t=17680
http://endless-sphere.com/forums/viewto ... =4&t=17679

Additional accessories (prices are reflected with controller purchase only. Please contact if you are interested to buy without controller):
$15 throttle (full/half/thumb) with mated left rubber grip (very good quality) (ebikekit retails @ $36)
$19 cruise control (manually installation required)
$15 three way speed switch (manually installation required)
$15 PAS - Pedal Assist System add-on (manually installation required)
$15 electric brake levers a pair
$29 motor/controller hall/phase/throttle tester