Sunday, August 11, 2019
I have about 1000 circuits in a binder I started in 1982, most of them culled from magazines and books and most of them hand-drawn! The early circuits below were drawn using Protel Schematic and are just a sampling of what's available and what I've done. (I've built hundreds of circuits.)


In 2010, I scrapped most ideas using integrated circuits like CMOS, TTL  and 555 timers and graduated to  Microchip PIC MCUs (micro-controller unit) for new projects. Easier to write software than doing it in hardware.  I've also started using Arduino products because they are so plentiful with tons of software available.  

Hover with mouse over a photo for description.

Motorola D5, 6809 development kit.
They wouldn't give me schematic so I reversed engineered it.
Atari 2600 mutli gamer
I"d read the Atari ROMS then duplicate them.
Autotransformer
schematic for Bunzilla, bunny robot
CNC I built
counter, multi function
light sequencer, like Darth Vader helmet
My very first project, dual power supply
generic dual timer
converter to go from edge connector to pin header.
EMF detector.
For my "stereo room", controlled various things.
17 servo robot, made in 2017
MacIntosh emulator for a Radio Shack Color Computer
Matrix display test, found an old Coco perf board to use
Max232 converts serial out of PC to TTL for MPU
PIA tester
Nicad zapper
Occupancy detector for train layout.
Persistence of Vision project (POV)
POV Leds on board.
POV PCB layout
Prototyping board for PIC MCUs
Board for making sounds on railway
Serial to parallel interface for printer
SFX Generator.  Was pretty cool.
SFX generator
SFX generator
Static stimulus tester, single step through an MCU
Stepper driver
Strobe bar
Strobe bar
Strobe bar
Thermostat control for heater that had none
Transistor tester, crude and simple but effective
Ultrasonic Ranger.
Volt-Amp-Speedometer for Train Layout
Volt-Amp-Speedometer for Train Layout
voice IC used on Duncan robot