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Added schematic. No access to home computer for a while, so cant get to Fritzing or Eagle. Working from Android using Droid Tesla SPICE program - some parts not available and improvised with TMP36 sensors and DC-DC converters. Also had to do a little artwork, post screenshot, to group Teensy...

Thanks for the reply. Controllable - I want to turn them on and off, based on ambient temperature. I will post a schematic shortly.

I have edited the post and it should be clearer. I have also added a second PCB image showing the components and a link to the voltage regulator datasheet.

Hi. This is my first post on this forum. I have been working on a temperature regulated thermoelectric cooling system to cool the CMOS sensor of a Canon DSLR camera for astrophotography work. I'm using aTeensy 2.0 (Teensyduino) to pwm a logic level n-channel mosfet (very low rds on...