
OK, you have an old retired audio mixer with more buttons than you know what to do with, and a bunch of old holdup buttons you saved from a dumpster for "that unknown project", what do you do with the parts? More to the point, what do you do on a rainy day with nothing else to do? |
![]() | ![]() |
| First, the key | A bit closer |
![]() | ![]() |
| Very close showing button cap which was a knob off an audio mixer | Inside, showing the weight and how button cap was notched for leaf spring mounting |
![]() | ![]() |
| Side view showing leaf switch | Under button cap, showing epoxy for stiffness and bounce reduction |
![]() | |
| View of entire interior showing liberal epoxy use to hold weight in place |
Over all, it seems to work fairly well. I had to debounce the contacts with epoxy. If I ever get a bakelite strip of the correct size, I may put it under the lower contact. However, since all dits and dahs sound alike after a few seconds, CW is not a high priority. I was hoping the project would spark a bit more interest in CW for me. I did have fun putting it together, though!!