I have been browsing your forum with some interest for some time now. I have noticed that many of you have problems with obtaining Kitter rotaries and also that the ALPS rotaries are very expensive. I also have been bogged down with this problem. It appears that the only solution is to the redec09b design by Leo. However I have noticed that this circuit only produces a pulse output once every 2 detents when using an "Incremental" rotary encoder switch (that is the theory anyway!). I was wondering if any of you have also noticed this problem. I am currently working on a new encoder board that will solve this problem. i.e. one detent, one pulse! I am interested in your comments because if you also have this problem then I may have a solution for you.regardsMike Smits

Hi Mike,It's always a good thing to have alternative circuits to work with.However, I want to correct you on something, if I may.The REDEC09b simply reads the pulses sent out from the rotary itself.BUT, there are various kind of incremental rotaries varying in bothnr of detents and number of pulses per rotation.Usually you will find 30 detends, 15 pulses per rotation. I believe THIS is the rotary you are using. In this case, yes, Redec does output only 1 pulse per 2 detents because that what the rotary encoder sends.I am using 20 detents/20 pulses rotaries and I get 1 pulse per detent.There are also 24detents/24 pulses rotary encoders but those are a bithard to find.George DorkofikisAthens, Greece

Hi GeorgeThanks for the info. I was unaware that you could get a 1 pulse per detent rotary. Can you please tell me who makes them and are they cheap? I also presume that they are grey type. Also are they optical or mechanical? Thanks again.RegardsMike Smits

Hi Mike,Got your email about Aussie Simpitters, trying to come up with something so we can communicate to each other.I'll be very intertested to see something other than REDec. Keep me posted!Regards,

Hi Mike,you can check the Alps (www.alps.com) EC11B20xxxx rotary (with push button) or the Alps EC11B24xxxx (without push button). The B20 gives you 20detents/20pulses per rotation and the B24 24detents/24pulses per rotation.They are mechanical grey type (aka Shift-Phase).Check out ELFA links below. Specs available there as well. I use theB20s with excellent results combined with REDEC.http://www.elfa.se/elfa/produkter/en/2028.htmhttp://www.elfa.se/elfa/produkter/en/2030.htmAlso this is the Alps equivelant to the Knitter rotary switches:http://www.elfa.se/elfa/produkter/en/2021746.htmThere are also rotary encoders from Greyhill, Bournes and others.Alps are the cheapest according to my research.Merry Christmas to all!George DorkofikisAthens, Greece

Hello everybody,Where can I find the board for redec09b? Marcelo

Send me your email and I'll send it to you.Regards,

Hi BradThanks. When I get a prototype going and CAD it up, I will post it here (should be in the next few days). But I read with interest George's comments so my design perhaps only applies for those who have rotaries that only produce 1 pulse for every 2 detents.RegardsMike Smits

Hi GeorgeThanks again for the info. I will check this out in more detail as soon as I can. The last site that you quoted is very interesting. Alps equivalent to Kitter SRBM1Lxxxx for $6. Our Australian supplier is charging nearly 3 times that price, which was why I was looking into an alternate.Regards and Merry ChristmasMike Smits

Oooopssss...I forgot to mention that the prices shown in ELFA are in Euro!Sorry...Merry XmasGeorge DorkofikisAthens, Greece

Hi George,Could you please send me your email address, I'd like to discuss further to you about these rotaries.Kind Regards,

george,I'm also looking at a rotary type that doesn't miss inputs when is turned fast, so I'm really interested in what you are talking about.my questions what's redec? is it related to fsbus?do you really get all 24 inputs per 360

Our Rotary Encoder Module, part of the SIM-board range of I/O modules we are developing, may be interesting to you. It's been specifically developed to work with both mechanical and optical rotary encoders, and can decode very quickly all types of encoders with quarter, half or full cycle pulse-to-detent ratio.We've tested/developed it using Bourns, ALPS and Panasonic rotary encoders amongst others. Works very well with all types. Both detented and non-detented encoders are supported, which allows for applications where smooth encoders may be more appropriate than detented ones (accurate positional feedback in home-made flight controls, for instance), as well as the more traditional positive detented feel to autoflight controls and other finger-operated controls on a flight deck.If you are interested we'll be putting up more information very soon on these, in the mean time check out:http://www.flightdecktechnology.com/and click on the SIM-board section.Chris

Merry Christmas to all and best wishes for a peaceful, healthy new year.I can't talk about the 24 pulses rotaries cause I've never tried them.I can only talk about the 20pulses Alps rotaries I have. They are connected to a REDEC and there are no missing pulses. No matter how fast I have tried to rotate them... Of course you wouldn't want to attach them to a drill and turn them at 300rpm!!!ALL mechanical encoders have a maximum rotation speed, no doubt about it. So check this value, if available in the specs of the rotary, too.I think the Alps EC11B20 that I use have a maximum rotation speed of 100rpm, that gives us just a bit more of a full rotation per second.I don't think you will ever go faster than that!!!! (unless you DO use a drill!!!)As for the Redec circuit, search this forum for Redec09a and you will find the link.Happy Holidays!George DorkofikisAthens, Greece

Thanks George, thats exactly what I wanted to know!Brad.