8051 2 wire IO expansion (1990s)
P89LPC932 CPU features flash ISP
AT89C2051 CPU programmer (1990s)
Various development products (1990s)
Standard ISP Programming header

AT89C51 Eraser circuit & PCB
AT89C2051 Eval circuit & PCB
AT89C2051 Programmer circuit & PCB
AT89C2051 Prog (2000s version)
AT89C51/52 Programmer circuit & PCB

Autotrax Gerber conversion service

Circuit Library index
Historic Circuit library page, intricate
Using a Mulitmeter

Circular PSU to suit LED Conspics
Serial to IRDA converter, Public domain
BEC promotional ruler PCB Public domain
BEC RS485 station (poorly autorouted)
Industrial Ultrasonic Flaw interface
Current loop tester (Public domain)
Fairfax industrial press power supply
Fairfax industrial press panel PCB
Fairfax Press turbo-flap control PCB
Quote for Honeywell override PCB
Serial cable spec
"Its Electric" mechatronic control unit
"Its Electric" interface daughter PCBs
"Its Electric" simulator test unit
"Its Electric" zero/span adjust datash.
"Its Electric" port pin assignment
Programmable Oscillator
Mosfet board for Programmable osc
Pressure sense PCB for Programmable osc
Nursecall overdoor light, Version 2
Redeveloped LCM 2002 controller
RAN PCB Repair School simple monostable
RAN PCB Repair School Multilayer trainer
Marine refrigeration control board

Lessons from Galaxian video hardware

Triple reed switch board
DC UPS: 12V 1A SLA, (discrete design)
Proof of concept EFTPOS keyscan monitor
Small 89C2051 LED dimmer project
QFP44 Breakout board
Simple front panel switches: A/D concept
RS232 to RS485 converter
RJ45 video terminator
RS485 8 port hub mimic - simple wiring

AirBorn "contact us" details
AirBorn sitemap This page

Picobus: simple 10 pin IO expander bus
Picobus Page 2, timing & Driving detail
Picobus P3, option, never implemented

1998 version RS232-RS485 conv, index
1998 version RS232-RS485 converter
Autotrax tutorial, based on 232cnv
2006 version RS232-RS485 converter

Autotrax alternatives
Autotrax resources - links to good stuff
Autotrax parts library - introduction
Autotrax library - parts list/dimensions
Autotrax parts library - agreement form
Using Autotrax: Bugs, workarounds,detail
Running Autotrax under DosBox, all OS's
Running Autotrax under Windows XP
Running Autotrax under Windows XP, FAQ
VESA video drivers for Autotrax
Protel autotrax/easytrax and NTVDM
DOS to 32 bit DLL under XP (example)
Autotrax DOS printer driver
Autotrax utitlies by Richard Aston

Circuit diagrams (How-to guide)
Firmware: Software for Electronics
Custom Electronics design, commercial
Documentation for Custom Electronics
Electronics: Engineering Change Orders
Producing etched PCBs for Electronics
Example of FR4 fire resistance
Printed Circuit Board layout
Assembling Printed Circuit Boards
Prototyping Printed Circuit Boards
Example realtime programming, 1990s
EMI & ESD considerations in PCB layout
The importance of a Spec in PCB design
Testing Printed Circuit boards
Volume Production of PCBs
Pointers for selecting PCB suppliers

Small 89C2051 project example, 1990s
1990s 89C2051 project, page 2
1990s light coded key project
1990s weighscale example project
Weighscale example project, page 2
Tone generator test project

(Older) photos of a PCB production plant
1990's era products made by AirBorn
1990's era AirBorn products, page 2
1990's era AirBorn products, page 2
(Older) photos of an Electronics workshop

RS232 connectors and pintouts
Serial to parallel converter project
RS485 Serial fire panel interface

Guide: Selecting an Electronics designer
Displays in specialist electronic units
Economics of R & D: Reinvestment
Some (older) Design Specifications
Index: The importance of Specs in design
Inspiration and Creativity in design
(Same page, different name)
Sales model: How to sell your product?
Electronic design spec: Technical elements
Guide to writing a Electronic design spec