This article is from the alt.comp.hardware.homebuilt Frequently Asked Questions. It is maintained by Mark Sokos (msokos1@gl.umbc.edu) with many contributions from others.
Heathkit is still in business, but unfortunately now makes educational products and not the kits that the used to make.
DIY Electronics has a list of kit manufacturers on their web page. http://www.hk.super.net/~diykit
Personal PBX: PCB with parts placement diagram, printed schematics and source code on diskette. Eprom also available. email: pcb@phoneswitch.com
 
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