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ECG on your laptop!
DIY EEG (and ECG) Circuit
Arduino Programmable Constant Current Power Resistance Dummy Load
DIY Constant current load
Used the extra op-amp on the LM358 for temperature controlled fan (white, dial potentiometer sets threshold temperature). Thermistor visible on top left corner (it's not pasted on top of the mosfet yet--I need to get some epoxy or silicone or something).
So anyways, here are the pictures. Made this a week ago. Like I said, the frequency is actually *half* of what is stated. Probably a frequency calculation mistake.Anyways, not a big deal. I use the TL494/KA7500 for more serious PWM stuff. This definitely works well too, but it suffers from frequency drift based on temperature and duty cycle. Range: 0.5Hz, 5Hz, 50Hz, 500Hz, and 50000Hz, selected by header pin. Around 8%-94% duty cycle.Anyw
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