Rotary Band-Switch VFO Control

I now have an interface circuit with software that allows the VFO to be band-switched with a rotary switch. Using a 74HC147 priority encoder, nine HF bands can be stored and switched in (1.8, 3.5, 7.0 MHz, etc.)

Please add $5.00 to the kit price. Rotary switch kit includes instructions, 74HC147, software to accomplish the switching, and the nine resistors and capacitors needed to pull up the 74HC147 inputs and filter the nine rotary switch positions for switch bounce.

I am assuming you have your own rotary switch (single-pole, 9 positions), as many users have these built-in to an older transmitter,etc. You will also need a small piece of perf-board to mount the included socket for the 74HC147.