MC2100 Dashboard Replacement Control Circuit Update
This is another quick update on the MC-2100 PWM controller project. I’ve tweaked the schematic a bit to put the 5v regulator at the beginning of the circuit, which I think is a better configuration. This circuit is currently on a breadboard, and worked great until the connections in the breadboard started wearing out (around a month of occasional use, including our paintball gun build day). Here’s the latest (and probably final) revision:
MC-2100 PWM Controller Circuit v4
When I started this project, I wanted to get this circuit working without a microcontroller for the sake of education and simplicity. At this point, I’m comfortable with calling that goal achieved. Now it’s time to move on to more features, like a tachometer and possibly closed loop control!
My current direction with this project is to develop a combined tachometer/speed control for the MC-2100 and my lathe. I plan to use an arduino to measure speed, display the speed via 4 digit 7 Segment modules (salvaged from the treadmill control panel), and send the PWM signal to the MC-2100. At this point, Joe and I have a working version of the code put together, and the circuit prototyped on a breadboard. I’ll update with progress once we’ve got something more final.
ajcharles, 
Sons of Invention 
Terry 11:03 am on February 17, 2013 Permalink |
I am using your latest circuit to connect to an MC-2100 board. Did you find the 7805 voltage regulator to get extremely hot? I am finding the current on the output of the 7805 to be in excess of 250ma… With a 7V drop (12 – 5) that works to a minimum of 1.75W to dissipate at the regulator.
schoolie 12:04 am on February 18, 2013 Permalink |
Hey Terry, I hooked up the circuit to take some measurements today, and mine was only drawing around 80mA. I also noticed a few things I’d left out of the schematic, and made a change that reduced the noise being picked up from the motor. I wrote up the changes here:
I’d love to hear how this works out for you!
MC2100 Dashboard Replacement Control Circuit Update 2 « Sons of Invention 8:46 am on February 18, 2013 Permalink |
[…] MC2100 Dashboard Replacement Control Circuit Update […]
ajcharles 5:43 pm on April 3, 2014 Permalink |
I tried the circuit it work well except I haf to make some modification tp it. I had problems keeping the speed constant so I hsd to add a diode frpm output to controller input. Also the frequency of my controller was 57.7