This circuit is able to add 4 bit binary values however any length binary numbers adding can be implemented this way. Values should be set using switches while there is -12V on blue trace. First value is represented by caps at top left and second by caps at top right. When caps at top represent exactly the same binary seqence as caps at buttom then result is ready. Remember to NOT press switches while calculation is beaing processed or you'll get wrong results. I had no space left to add more switches but if calculation is done you can still press switches again to set bit to 1 if there is 0. Result is stored on top left
