Frog Flash

D2 design for a sophisticated secondary flash-on-a-stick with optical slave circuit cobbled together with photo resistor out of printer and a high voltage triac from something else; works great....will use shortly for spring frog photo quest as peepers recover from recent very cold night....

35/100

Civil War reading; about of a third of the way through...

Web Server Audio Amplifier Interface Board

D3 work in process on interface board to be installed inside web audio amplifier chassis: includes 6 gain controlled amps, 2 shift registers, 12 bit ADC, 10bit DAC, 3 volume/tone control ics, 44amp HEXFET and connector (on right) for PIC-WEB.

Eprom Array Out of GPS

D3 prototype board with a pair of eproms out of a handheld GPS, interfaced through shift registers to Arduino processor with relays for switching programming voltage.

Web Server Audio Amplifier

Snapshot of work in process....D3 concept and design for a high power audio amp controlled by a PIC-WEB board (not installed yet).

Arduino & New Prototype Box

Arduino controlled dot matrix LED out of an exercise treadmill; D3 is creating a font library, and has also connected a 1Mb flash memory IC to store and read fonts from directly. Also showing new prototype box with breadboards, LCD display, and heatsink.

Arduino-Shift Register-Stepper Motor Control

D3 work in process....an xy stepper motor board driven by high power transistors with signaling supplied by a shift register sequenced by C code running on an Arduino micro-controller. Will add power transformer, mount heat sinks, and circuit board with Arduino, finish wiring, and complete coding. Black & yellow wiring is out of IBM 3274-see earlier post.

Server Farm

KVM Switch PCB

D3 PCB layout for new KVM switch.

KVM Switch Schematic

D3 design for a scalable KVM switch.