Recent content by richmpdx

That is really cool that the logged data shows the CA3 can produce perfect alternation of human and electric motor power to maintain essentially constant speed. I am guessing that you didn't anticipate this particular application when you designed the CA3. The dip in the current that can be...

Extraordinary, great to see the detail of the rowbike conversion. Seems like a really good use of ebike technology. Returning briefly to the "string", I was really surprised to find out that the material is Ultra High Molecular Weight Polyethylene. I was expecting something much more exotic...

Very interesting bike. That must be some kind of "string" that transmits the combined power of the riders legs and arms to the rear wheel.

Very nice pack build. You do such meticulous work.

Nice video, great ride location. Thanks for sharing. Interesting that the BBSHD handles the sustained climb with no problem. Obviously that is not your A2B, what's the ride?

Measured the voltage between the gate and source for the 4110 FETs when the control power is "off" which is the condition where my build of the board has a voltage oscillation at the output. Under these conditions the voltage between the gate and source for all 4 main FETS seemed to oscillate...

Thanks for the diagnostic. I will give it a try. Carefully. Rich

It is certainly possible that I damaged something while soldering things in place. I initially had trouble with the 4110 fets because of my underpowered soldering iron, maybe I damaged one or more of them? Rich

Used the meter with locked ranged and observed voltage at the controller. Turns out the voltage changes are sufficiently slow and small enough in magnitude that the bargraph probably wasn't necessary. With control voltage on, voltage at the controller is about 70 v. With control off, voltage...

I have a Fluke 117 which although I have never paid attention, I think has a bargraph which is supposed to respond relatively rapidly to voltage changes. So if I just monitor voltage at the connection to the controller using the Fluke 117, it should yield the kind data that could be helpful? Rich

I changed R3 to 3.3K as suggested to address the shut-off issue that resulted in periodic flashing of the Cycle Analyst screen after turning off the master switch. Before changing R3, I counted the number of screen flashes over 10 secs and determined that after turning off the master switch...

Here is an image of the v1.1 board in a Hammond 1551K box

For all components, I tried to use what was specified by the BOM. It is of course possible that I didn't understand something. So I have listed the BOM below followed by the parts I used. If anything isn't clear, I can include the Mouser part number. R1,R2 1M - 1 Mohm metal film resistor, 1%...

I used 4 x IRFB4110 main FETs. On my bike I rarely exceed 2 kw, so I am not anticipating any heating problems for the switch. Rich

Update on using the Hammond 1551K enclosure. The board easily fits. I have not been able to locally find the #2 self taping screws to mount the board in the box (they are not supplied with the enclosure). One issue for the box will probably concern the leads to the battery and controller. I...