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Footswitch schematic for SmartSDR for MAC
There are many ways to toggle RTS (a level on an RS232 port) so that a foot switch can be made to function on SmartSDR for MAC.
You can use a full FTDI USB/RS232 cable or there these boards available online from eBay or Amazon and many other places like robot shops.
I am using the Gikfun FT232RL 3.3V 5.5V FTDI USB to TTL Serial Adapter Module for Arduino Mini Port and I bought 2 of them for $12 Canadian. I then added some heat shrink and with a printed heat shrink label so I remember what it actually does later in time. :)
The creative types may want to do this and hide it nicely in the footswitch. I might do that with my next version. As well, I am using an inexpensive foot switch I bought off Amazon. Installing this in a footswitch would make a cool-looking USB footswitch.
I have added a 10K pull-up resistor to ensure the level stays high and not floating, which is a good practice and I also added a 0.1uF cap to help with debounce issues.
You could also do this with a hand switch if you wish.
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