Power for Audio Amplifier

D3 design for new power supply for high power audio amplifier built into small Sun box. With two additional transformers, 22 pounds on the scale....

27 Years and Now Our First Dell

Our Cloud Wizard has built our first private cloud: Arrived today-Dell T100 server based on dual-core 3Ghz Xeon processor with VT technology to support node role in Eucalyptus cloud architecture running on Ubuntu. D3 has an instance of Ubuntu server running on top now and I've applied for an account-hopefully the administrator will approve it.....

Latest D3 Invention

A new circuit design with a micro-controller dimmer for an array of overhead lights; first installation planned in our basement ceiling.

IBM 3274 Controller

Very heavy gauge steel for cabinet, card cage rack, and other components. The maintenance manual has detailed schematics, waveforms, and assembly diagrams for every subsystem and component. Discontinued in 1990; now in our back yard under the deck!

8 Inch Floppy Drive out of an IBM 3274 Controller

How often do you find an IBM 3274 controller? 1.2Mb formatted capacity?

500Gb 7200 RPM Drive

Failed drive...ebay purchase gone bad...

Oven Controlled Oscillator

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

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.

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.

Personal Music Studio

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