Re: [DIYbio] Electronic requirements for redesign of Arduino PCR thermal cycler

On Fri, Feb 27, 2015 at 12:23 AM, Nathan McCorkle <nmz787@gmail.com> wrote:
> On Fri, Feb 27, 2015 at 12:20 AM, Nathan McCorkle <nmz787@gmail.com> wrote:
> Whoops I meant this part:
> http://www.ebay.com/itm/Stepper-Motor-Drive-Controller-Board-Module-L298N-Dual-H-Bridge-DC-For-Arduino-/170926726867?pt=LH_DefaultDomain_0&hash=item27cc06ded3

Grr... it is late and I didn't check the amperage/wattage of that...
and it seems like it would be too low. But essentially what you want
is a DC motor driver for an 'arduino' or that is 'arduino compatible'.
You would have to do some crafty ebay searching, and cross-reference
google, but I think something like this should exist pre-made.

The circuit the iGem project presents does seem like it would work
well... it looks like the response time of the LM339N is between 300ns
and 1.3 us... which is fine enough response for PWM control (where you
pulse the signal rapidly in short bursts... to approximate an analog
signal level from just a single supply voltage).


--
-Nathan

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