Battery Charger

Battery charger IC expertly mounted by D3 on small PCB extracted somewhere along the line, with external PNP current transistor. Successfully charging single cell batteries.

BlinkM for Light Writing

Presets can be programmed into the i2C EEPROM and then read by the ATTINY25V (not on board now) the BlinkM will be connected with alarm wire for light writing. As of now, the MCU is in the programmer. The firmware is written in AVR assembler.
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First Theremin Prototype

GPS Logger Rev 2.0

Currently undergoing final design review before ordering PCB and parts....

GPS Board with Components

With all components installed exept the GPS module, waiting on shipment.

GPS Circuit Board

Just arrived!

Nice work by www.ultimatepcb.com (OverflyPacific Corp).

Cool GPS Logger Design

We Have Light!

Prototype "breadboard" for Nixie tube circuit....power supply out of large plasma TV provides 200 vdc, with required start up logic controlled by Arduino micro-controller sequencing code. Nixie tube elements also controlled by Arduino through transistor array IC, top element illuminated in this image.

Video Mux

D3 cool design and fabrication of an AVR controlled video mux for media lab. Temporary external wires in place for testing and power; on-board regulator to be added. Center pin connector for AVR development module.

Very Cool D3 Watch Design

Motor Controller PCB

D3's first commerically fabricated PCB arrived yesterday....exceptional results....now loading devices and developing code for on-board AVR.

New Motor Controller Design

D3 Design for an AVR controlled H Bridge motor controller based on high power FETS with complete PCB design.

More Progess....

D3 is now using an ATMEGA 164PV10PU programmed via an AVR Dragon board, with remote Zigbee communications for speed control (bottom)....a power supply out of a LCD display (center) provides circuit voltages and 24VDC for the motor.

D3 Robot Motor Control Module

High power IGBT's mounted to the heat sink with large clamping diodes on the first circuit board, and control logic with opto-isolators on the top board.

D3 Design for an Optically Isolated Triac

Driven by a square wave, the light flashes at low frequencies followed by this unusual pulsing behavior in a narrow transition range as the frequency is increased beyond a few hundred Hz, and then returns to normal flashing at higher frequencies.

Guitar Pre-Amp

D3 pre-amp circuit for guitar amplifier project.

KVM Switch PCB

D3 PCB layout for new KVM switch.

KVM Switch Schematic

D3 design for a scalable KVM switch.

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.

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.