Re: [DIYbio] Re: Low cost PCR(under development)

Yep, think about a hair drier. I also have a hot air PCR
thermocycler... it uses a light bulb for a heater... but didn't seem
to have a great ramp rate.

For modifying a hair drier heater coil to be arduino-controllabe,
these two instructables should be useful:
http://www.instructables.com/id/Extreme-Surface-Mount-Soldering/step1/Order-Parts/
http://www.instructables.com/id/Closing-the-Loop-on-Surface-Mount-Soldering/

they don't include snubbers, so couldn't be used to control the fan
motors, but it will work for the AC heater component which is going to
be higher amperage than the fan(s) anyway.

On Mon, Jun 30, 2014 at 6:48 PM, Cory Tobin <cory.tobin@gmail.com> wrote:
> Actually, I take back what I said about air not transferring heat to
> the sample very quickly. I remember a device a long time ago, I think
> it was called the "Indee" or something like that, that used really hot
> air and circulated it around the tubes really really fast. I think
> the ramp rate was around 8C/s. They basically made up for the poor
> thermal conductivity by heating the air up to like 200C and then
> bringing it back down as the calculated sample temperature reached the
> target temperature. Which made it faster than the peltier devices.
> So maybe air wins out in both cost and speed if designed right.
>
> -cory
>
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-Nathan

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