Schematic 0.03

Schematic v0.03 This is an expansion on 0.02. It closes the loop, feeding the temperature readings into the amplifiers. It can both heat and cool. The circuit as is, is limited to about 300ma of current at 12V, increase the current by reducing the value of the 10 ohm resistors. But be careful, the resistors will need ratings of at LEAST one watt, and the power amplifier will need heavy heatsinking.