Or you can couple a higher frequency signal onto the power and pick it back off on the board. Bob Ammerman RAm Systems ----- Original Message ----- From: "Olin Lathrop" To: Sent: Friday, August 30, 2002 7:32 AM Subject: Re: [PIC]: Propellor Clock > > 12VAC power if fed by 2 slip rings. > > Hmm. You may be in for some long term problems with this approach. There > is a commercial product out there that uses slip rings. They have problems > with both noise and reliability. > > > The 50Hz AC wave form also suppies timing for the clock. > > > > 100 pulses/sec = no press > > 50 pulses/sec = press > > As someone else already pointed out, you could use a FET in the right place > to achieve the same effect. Another possibility is to pass DC to the rotary > board and then superimpose a digital data stream on it. This can supply > both clock and control information. > > > ***************************************************************** > Embed Inc, embedded system specialists in Littleton Massachusetts > (978) 742-9014, http://www.embedinc.com > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads