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Training the hand and mind since 1982.

Monday, February 14, 2011

SMT work

Some stuff I'm working on in SMT. The top PCB is an ATmega328, Arduino Mini 04 clone. I basically stripped the stuff I didn't need. The regulator, caps, protection diodes all have been removed and strip down to just the 328 and a resonator and a pull up resistor for reset.

The bottom PCB is a break out for the MAX4239ASA+ Ultra-Low Offset/Drift, Low-Noise, Precision op-amp. I'm currently developing a cheap current detector for the arduino. Basically it's a current to voltage converter (0-1A input 0-5V output) in a differential amplifer configuration for the op-amp. I have a .01 Ohm 1% current sensor resistor in series with the load to detect the current. This should give me a resolution of .9mA per step with a very low burden voltage.