Circuit Design Library

AirBorn Electronics is a custom electronics design company. We specialize in medium/small embedded microprocessor circuitry often using data communications. Please contact us for a quote. This design library contains some reference examples of our work.

You are welcome to use any of this material for reference or experimentation - however, we reserve all rights under copyright law to prosecute any individual or company exploiting this material commercially without prior written permission from the copyright holder. No warranties are expressed or implied for the use of this material. We will grant written permission (no charge) for a quantity of up to 25pcs production of any of these designs, just send your details and your target application to us here at AirBorn Electronics Ph (61)(2)9925 0325. For larger quantities we charge a small license fee, but we give the first 25 free all the same.

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HSETI1 - AT89C2051 project PCB

• 8 High current drive LED strings
• Speaker drive output
• Photo sensor input, adjustable sensitivity
• Unused lines (incl. serial port) available on pads
• Battery Powered

Unlike the other circuits on this page, the small HSETI1 PCB is specifically available to any and all who want the design, copyright free. Individual diagrams are available on the links below, and the complete HSETI PCB design is also online.

Australian Customers: You can get faster downloads on our AUSTRALIAN MIRROR

485hub1 - RS485 Active Hub (5 port)

• 5 signal buffered party line data ports
• Industrial grade pluggable wiring block connectors
• Handles all NRZ protocols (Protocol independent)
• Plugpack or 12v supply

Serial to Parallel converter


• 9600 Baud RS232 input - Alterable in software 1200 - 57,600 Baud
• Centronics style parallel output - Busy, 8 data lines, strobe
• Bidirectional - Parallel data tx'ed back out serial port when switch/signal asserted
• This PCB is the prototype board supplied with the PG2051 programmer.

• Explanation and features
• Evaluation kit circuit diagram - used as basis for the serial to parallel converter
• Serial to Parallel converter firmware - written in 8051 assembler (copyright free)
• tasm32.zip (or original from telemark) - assembler to compile the firmware

RFkey1 - RF Key (Interrogative type)


• Challenge response authentication over 300MHz link
• Single chip microprocessor controlled
• Battery powered, status LED
• 90 x 50 x 23mm prototype

Sonar1 - Buddy line Sonar - direction finder

• Underwater recreational diving direction finder
• Ultrasonic Tx/Rx
• Magnetic coupled switches
• Backlit LCD display
• 12v Gel cell powered

RCM710 Electronic Scales

• Electronic scales with Fluro display and membrane Keyboard
• System capable, with RS232 interface
• Batching output control capability

This larger project has several pages of circuit diagram

Keyboard section for electronic scale project

ICL 232 chip - RS232 To TTL Level translator PCB

• Dual RS232 to TTL Interface - two DB9 connectors
• DB9's are handshake looped
• 6 pin SIP TTL Interface connector
• Suitable for 8052MCRO PCB

AirBorn Electronics - microprocessor electronic design and manufacture - Design step by step

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