Welcome to the N1IR Electronics Website. Totally off the cuff, one take, unrehearsed video projects for anyone interested in amateur radio, electronic design, makers, hardware hackers and science.


Get off you duff and build something!
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.