georgethank you very muchthat's exactly what I was looking for. The only thing I care is they don't miss inputs when they are turned fast and I think it will work fine also with 24 inputs per 360

I just want to correct myselfat rs-components alps encoders have an higher cost than at elfa.

This may be a late answer, but I believe that the following switch is a solution for our dilemmas: (1) Cost (2) availability and (3) programming It is a rotary pulse switch from Alpha. - Costs under $5. - Available from Mouser (www.mouser.com) and,- functions just like the knitter encoder/switc(CW=contact poles 1&2, CCW=contact poles 3&4)- multiple detentsIt should work well with any app that uses one key to increase a value and another to decrease it. You shouldn't need any additional interfaces or software. The only drawback is that it is PCB mount.See the catalog (page 864, Item D) at http://www.mouser.com/index.cfm?handler=di...e_pcodeid=01019I have not tried it out yet...but plan on using it with my FSBUS system on the radio stacks. Anyone had problems with Pulse switches? Seems like an ideal solution for our rotary switch mess!

:-jumpy Hi AllI have been looking into a cheaper more reliable alternate to redec09b design. Of particular interest were the comments made by George. With this new info (Thanks George) I see no point in re-inventing the wheel. (SORRY FOLKS!) The redec09b design by Leo, is still the most effective for converting "Incremental" encoders. But I note that there is no filtering for mechanical rotaries. So if anyone has experienced funny effects when turning their rotaries, it may be the result of contact bounce. I have only 1 PIHER rotary thats a bit faulty, but with a 100nf capacitor on each input and tied to GND, this has fixed my problems. I will be purchasing some ALPS EC11B20xxxx units as George suggests.Also I note that the redec09b circuit uses 3 IC's for each rotary. But on 2 of the IC's there are spare logic gates. I don't want to get too Tecky here but if you want to use 2 rotaries then you don't need to have 6 IC's. You can get away with using only 4 IC's. If you want more info then I will post it.HAPPY NEW YEAR ALL!RegardsMike Smits

Hi!I already did som etching and sketching on a redec for 2 rotaries per 4 ICs.... Couldnt pull it off because i want a single layer pcb, and the connections became WAY to many to do it on a single side pcb.... Will see if I get the urge to take it up again...From what I understand, the redec handles debouncing.... am I wrong?/ Olle

Hi mikeI'm just going to build a mcp with seven rotaries using fsbus with redec and alps rotaries, so a pcb for allowing two rotaries with just 4 ic would be great. About redec09b, everything I found on the internet about it is a pdf document in wich leo is not mentioned, I'm wondering if I missed something?bye

Yeap... 6 ICs is too much... How about 4?...Already did it and it works great! Decoding 2 rotaries with 4 Ics.And... yes... on a single sided 60x45mm PCB. :-)BTW, the Redec09b design already filters out bouncing (up to a limit), but it can't repair a faulty Rotary. My advise... Don't turn your rotaries with a drill or more than 1 rotation per second. It will ruin them. Unfortunately the good optical ones that the real a/c use (for durability and precission) cost about... $350-800 each. (Ouch!)George DorkofikisAthens, Greece

No wonder I didn't get a real aircraft for Christmas...... :-mad

George,I'm interested in your modified redec circuit. Is it possible to post a schematic or detailed list of changes to the original so we can build it?I am getting ready to take the plunge and build my cockpit after reading through alot of the information here. I've spent weeks browsing and searching to find out all I can about how to begin, and am making a parts list now.Thanks,Gary

Gary,I'm in the very same situation. Me too interested in this 4 ic 2 rotary pcb.happy new year everyone

A little patience will be rewarding.First I want to etch the PCB and check it. Currently I have assembled the design on a vero board and works great. But I can't be sure about the PCB until it's etched and tested live.Happy new year !George DorkofikisAthens, Greece

George,Thanks, It will definately make things a little easier when I add all the rotaries!! I think I'm going to use the Alps EC11B20's as I have read they work fairly well and are inexpensive.Thanks Again,Gary

Hi GaryHere is a design that I think you may find useful. I have tested it and it works fine. It is on a single sided PCB of around 5cm x 5cm in size. It uses 6 wire links. Please note that the artwork shown is from the solder side. Capacitors on the board are only required if you encounter noise problems.RegardsMike Smits

Hi GaryOops, my upload did not work! Send me an email and I will send you my design.RegardsMike [email protected]

Mike,Email sent,[email protected]