Friday, October 16, 2009

Oven Controlled Oscillator


A remarkable find, a 5 Mhz oven controlled oscillator that works great! Excellent reference and calibration source.

Saturday, October 10, 2009

Magnetic Sensor Vehicle Detection


Early working prototype of HMC1021S single axis magnetic sensor (D3 mounted on green board top) with output amplified by AD620N instrumentation amp feeding a LM393N comparator. We've tested and measured a response of approximatedly 30mV (output of amp) to an auto at a range of 3ft.

Monday, September 14, 2009

Conduit Time


Given a large trench in the front yard, installing a conduit pre-wired with Romex, coax, cat5, heavy gauge 12vdc, and speaker wire plus a pull-string seemed to make sense. We've built it with junction boxes on each exterior end plus two access ports on either side of the sidewalk.

Wednesday, September 2, 2009

Personal Music Studio


The orange spot on the blue cushion is from a led array mounted on the ceiling!

Sunday, August 30, 2009

HAL for Home


RFID Keyed Entry: D3 designed a circuit to convert the square-wave output of a RFID reader to control a relay that is connected to our garage door opener. This is an inside view of the assembly and installation. On the front of the house, waving a tag just below the small red LED (visible through the hole and on the front to indicate sensor location) opens or closes the door.

Thursday, August 27, 2009

Monday, August 17, 2009

Quansoo Terror


A Fiery Searcher: these guys are predators with a particular interest in caterpillars. They are one of the largest beetles in North America. Thank goodness for window screens....if you click on the image for a larger view it may lead to nightmares....

Saturday, August 15, 2009

Fort Rodman HDR


Early experiment with HDR imaging using Photomatix.

Thursday, August 13, 2009

Can we send an invitation for a cup of coffee or a beer?




Perhaps a mile north.....we've already seen the big-no HUGE-black pick up truck with a SAM in the back bed, secret service with guns guarding the guy with the black briefcase, helicopters, fighter jets, Coast Guard cutters, and more....lunch on the deck is clearly being viewed from a satellite..

Friday, August 7, 2009

We Don't Need No Stink'n Crane


An eminently practical approach to painting the boat bottom by taking advantage of the tide....