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Circuit Design Library

Thank you for deciding to look at our work. Not all of our designs are here, but some reasonable examples. Each line below is a technical project page, with PCB, circuits, - the technical information necessary to maintain, use, and make that project.

If you are interested, we also wrote the embedded code for these projects and the tools that take the CAD data and transorm it into these presentation web pages.

• Serial to IRDA
• Ultrasonic flaw detector
• Danfoss loop tester
• Serial to Parallel
• Navy SMD Trainer
• Fairfax industrial press panel PCB
• Fairfax Press turbo-flap control PCB
• "Its Electric" simulator test unit
• Programmable Oscillator
• Pressure sense PCB for Programmable osc
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• Nursecall overdoor light, Version 2
• Redeveloped LCM controller
• RAN PCB Repair School Multilayer trainer
• DC UPS: 12V 1A SLA, (discrete design)
• Proof of concept EFTPOS keyscan monitor
• Small 89C2051 LED dimmer project
• Simple front panel switches: A/D concept
• RS232 to RS485 converter
• RS485 8 port hub mimic - simple wiring
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• BEC promotional ruler PCB Public domain
• BEC RS485 station (poorly autorouted)
• RS485 Serial fire panel interface
• Autotrax tutorial, based on 232cnv
• RS232-RS485 converter
• 1998 version RS232-RS485 converter
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• Our early circuit library - (1990s)
• Hseti PCB - AT89C2051 LED driver (1990s)
• Fully documented weighscale (1990s)
• Serial to parallel converter (1990s)
• "Trivial" RS232 protocol monitor
• Access key using visible light comms (1990s)
• RS232 to RS485 converter (1990s)
• A test tone Generator, micro based (1998)

Necessity is the mother of invention, it is true -- but its father is creativity, and knowledge is the midwife. -- Jonathan Schattke