Anyone (simon hint hint) care to do a back-of-the-napkin estimate on the max ramp rate for tubes immersed in a flowing water thermocycler if the system can source 850 watts?
Simon, re: filling tubes completely with water - not what would happen; would the reaction just proceed more slowly in a more dilute system as long as the concentration ratios were maintained, or would it not work at all or be unreliable?
On Tue, Feb 2, 2016 at 6:39 PM Nathan McCorkle <nmz787@gmail.com> wrote:
I've thought about this for a few years... it started while waiting in front of a drip coffee maker I think... I even bought some brass 12V valves from ebay, but I have never touched them (and there's not much biohacker scene here, I guess)
On Tue, Feb 2, 2016 at 10:36 AM, Mac Cowell <mac@diybio.org> wrote:
> $20 is still probably cheaper than this 3D-printed servo-driven ball
> valve... But the servo could be handy.
> http://www.thingiverse.com/thing:1052421The $4 solenoid valves are $7 on AdaFruit, with the addition of a helpful voltage vs current table:--
Voltage Current 6V 160 mA 7V 190 mA 8V 220 mA 9V 240 mA 10V 270 mA 11V 300 mA 12V 320 mA While they're recommending "a TIP120 or N-Channel power FET with a 1N4001 kickback diode to drive this from a microcontroller pin" I note that the voltage and current limit on a ULN2003 is 50V and 500mA... these are common driver chips that come with kits for LEDs and motors on ebay, etc... for driving such loads from a microcontroller/other sensitive source.
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