Morsemaster switches, part II

Blogged on the Morsemaster switches before:

https://wb9kzy.blogspot.com/2023/11/switches.html

Here are some scope pictures of the Radio Shack switch bounce:

Start switch:

Repeat switch:

Reset switch:

The bouncing isn't horrible but it isn't consistent either.  The main thing is the "feel" of the switches, they are hard to press and just not positive.

So I replaced the three switches with C&K 8121 switches, made in USA circa 1984:

These are available on the Switch and Part page (scroll down near the bottom of the page):

http://wb9kzy.com/switch.htm

Here are some scope pictures of the C&K switch bounce:

Start switch:

Repeat switch:

Reset switch:

There is plenty of bounce but it is consistent and stops within 1/2 millisecond.  Note that the reset trace doesn't show bounce with either the Radio Shack or C&K switches due to the Morsemaster RC circuitry.  Again the main thing is that the feel of these switches is MUCH better, a positive short press with a tactile click, just what I want in a switch.

Now to start using the Morsemaster II again !  N4MW has kindly posted the manual for the Stone Mountain Engineering kit here:  

http://www.n4mw.com/cp247.pdf

Here is the N4MW page with a picture of the Morsemaster II kit:

http://n4mw.com/cp247.htm

BTW, I was going to try and run the Morsemaster II from a 9V battery but it needs 100 mA ! of current to function.  So I will have to scare up an eight or ten cell AA Nimh battery pack with a 9V snap if I want to use the Morsemaster without a wall-wart.

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm