My Mosquita got a new housing as described in this post. As you can see, there is still enough room for a memory morse keyer.

 

I found a really neat solution in the JackYack created by Jack, AI4SV. It consists of only 12 parts and a programmed ATTINY85 microcontroller.

This keyer provides enough features for a portable and fixed operation. a complete list can be found in the PDF document.

I've ordered three boards from OSHPARK. This how the integration in my Mosquita looks like:

 

I replaced the onbard piezo buzzer with a 10k pot and used a 5nF cap to couple it into the AF path.

IMG 2450

The complete schematic for my Mosquita:

Verdrahtung

One is inside my Mosquita, the other two are available, fully populated and tested. 

  

I've build two versions. One for a supply voltage from abt. 8VDC to 20VDC (the right one in the picture) and another one for usage with a coin cell (the left one in the picture). Both version are running the 0.87 firmware version. If you're interested in one of these keyer, please contact me by Diese E-Mail-Adresse ist vor Spambots geschützt! Zur Anzeige muss JavaScript eingeschaltet sein!.

2014 CW (Morse Telegraphy) was added to the German Nationwide Inventory of Intangible Cultural Heritage.

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