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When I am wearing my tech support hat, one of the tools I find useful is AACircuit by Andreas Weber. AACircuit is a schematic editor program that lets you draw simple electronic schematics using only printable characters. That means you can send them by email without messy attachments, worrying about file formats etc. The program has a library of the most commonly used electronic circuit symbols, and you can add your own. The only requirement for viewing the schematics is that the email reader be set to a fixed pitch font such as Courier New. Here's an example of AACircuit's output:
TTL to MMi99 input interface
BC547 MMi99 I/P
10K --------------------
TTL input ___ |/
------------|___|------|
|>
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GND | MMi99 0V
-------------------------o------------------
AAcircuit is freeware. You can download it from http://www.tech-chat.de/
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