I've been playing with my new Spektrum transmitter and trying to work out how I would like to control the sounds in the Amplifier module.
One of the issues I felt with using a rotary control such as an encoder is that you need to remove your hand from the transmitter to rotate it and to activate the switch, so I wondered about going back to the toggle switch mode on the Benedini board but using two switches to select the sounds.
In the end I came up with a simple system which uses two push-button switches, one at either side, at the back of the transmitter:
The black one selects the sound - three presses for sound three etc - and the red one then activates it.
When opening the two halves of the transmitter, watch out for the second antenna cable, as it's cable tied to the front half and is quite tight.
I used the connections from the left hand rear rotary control and programmed the transmitter to use this as the Aux 1 channel.
The two rearmost switches were de-soldered and removed. The connections for the rotary control were removed and the new push button switches installed and soldered in. I have used four resistors to make up the necessary network. Two 470R ones go to the positive and negative rails. These limit the voltage going into the RC channel, but also prevent there being a complete short across the rails if both switches are pressed at the same time.
Two 2K2 resistor are soldered across the switches and provide the differential to signal when one or other switch is pressed.
I've put the transmitter back together and tested it with a TBS5 and it all seems to function as I had hoped.
So now I can activate the sounds with two spare fingers without removing my hands from the transmitter.
Adrian.
