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Power Amplifier 

The power amplifier stage uses the 100 kHz pulse width modulated (PWM) output from the TL598 to switch the Darlington configured power transistors.  The switched output from the power transistors (Q4 & Q5) is low pass filtered (L1 & C5) to remove AC content before applying to the thermoelectric device.  The switching of Q5 could not be accomplished without the fly back diodes (D1) to supply the L1 current during the transistor (Q5) off period.

The triac (Q3) is used to switch the AC powered water pump on when the computer is turned on.

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University of Victoria    Faculty of Engineering    Dept. of Electrical Engineering
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Last updated: April 6, 2001.