HB: HTX-10 cw adapter, v 2.0


From: n5ib@juno.com
Date: Sat Jan 01 2000 - 15:43:46 EST

Happy 2000 gang,

Version 2.0 of the cw adapter works much better. The timing is fine now.
The only problem left is that the relay I'm forced to use (60 mA coil, 5A
contacts) pulls in too slowly so the first element is clobbered and
sounds a chirpy. A new faster relay should cure that. After the relay
pulls in the note sounds OK. I'll be trying it out on the air over the
next few hours near 28.060 (it's almost 1500Z now)

So, don't build the one that's posted now! :^)

Timing is done with a 555. The twin-T oscillator is keyed with a
waveshaping circuit, and an emitter follower buffer runs all the time.
Still fits in the Altoids tin as pictured at <http://www.qsl.net/n5ib>

I will update the schematic and post a notice to that effect within a day
or so.

Jim N5IB

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