[simpits-tech] Who is using a Centipede shield to drive their LED's ?

[Cris Harrison]

On 11/25/2013 9:05 PM, Matt Bailey wrote:
> On Mon, 25 Nov 2013 17:41:37 -0600
> Cris Harrison <phoenixcomm at gmail.com> wrote:
>
>> On 11/23/2013 12:36 PM, Matt Bailey wrote:
>>> On Thu, 21 Nov 2013 19:24:40 -0800 (PST)
>>> geneb <geneb at deltasoft.com> wrote:
>>>
>>>> On Thu, 21 Nov 2013, Matt Bailey wrote:
>>>>
>>>>> I used a couple of these stacked on an Uno to read all the analog
>>>>> radios (including the old-style dial ADF tuner) in a 737 cockpit.
>>>>> Works a treat. :)
>> Ok I must be missing something but how did you interface the
>> old-style ADF tuner
>> http://www.flickr.com/photos/phoenixcomm/11035935653/in/set-72157634078960474
>> that is the collins radio in the uper left?? I have the pin-out and I
>> got the switch (bands) ok but the dial is connected to a sychro
>> transmitter in there.  Any help would be cool..
>> Cris H.
> That's just like the one I worked on, a Collins 614 if I am not
> mistaken. These things were everywhere back in the day.
>
> My solution was to gut the original synchro, and use the synchro can to
> mount a rotary potentiometer. This is one of the few cases where
> dumping the synchro in favor of a pot actually works, because there is
> a pre-defined start/stop limit to the travel of the dial. It was a bit
> of hacking, but ultimately ended up working very well. Obviously the
> analog nature of the device is not well suited to the rigid digital
> requirements of a flight simulator (because, unlike on a real ADF
> radio, being one or two digits off from the station's frequency gives
> you nothing, you have to be EXACTLY on the right frequency). It was
> still good enough to be usable for navigation with just a bit of
> fiddling on the tuner knob.
>
> I didn't worry about detecting the two higher scales, since no NDBs use
> frequencies in those ranges anyway in the real world.
>
> Matt
Oh well that what I though that hack is nasty... The dam thing is in 
there.. TG I found the repair manual as the Collins unit was also used 
in the military.. Until I read the dam thing I could not figure how to 
get the little sob out of there..
on the EXACTLY: you can code it into the software ie.. "a table driven 
fudge factor"
kind of like look at Vin (from the pot) and know that v corresponds to 
lets say 5 on the dial so just make the upper and lower bounds a little 
wider.. and or you can use less precision (less bits of resolution) to 
do the same job or a combo of both.. .
  CAH