There are a number of keyer solutions available, many using the ubiquitous PIC chip – a device favoured for its low cost, low external components count, and ease of programming. It would have been easy to just buy one of these chips off the shelf; indeed K1EL produces very popular keyer chips for as little as US $8 at the time of writing.
However, I really wanted to see analogue speed and weight controls on the keyer and there was a tube of PIC16F877A chips each with 8 x A/D converters going free from a previous project…
You can get more information from:
Keyer specification - a list of bullet points describing the main features of the keyer.
Keyer circuit diagram - also contains a description of the circuit operation and menu commands.
Software - download links to the hex file and complete source distribution.
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