HI Pete/Jeff, I was not going to post to this thread but here I am. I have my EIS wired as noted from the negative of the coils (daul). i have a small toggle swithch right next to the tach on the panel when I switch ignitions I have to switch the signal to the EIS also to have a reading. I wired it this way as it was the most common way when I was growing up working on cars. I understood as Jeff has re-confirmed that it is basicly the way a mag works also. The disclaimer is that William Wynn strongly (my word) urges a alternate method, usually a tooth counter, to drive the tach. Granted this would elminate my need for the swich on the panel. The caution that I undersatand is the possibility/fear of a short in the wire from the tach or the instrument that takes the coil out and there by stopping the fan up front. Just because it hasn't happened does it mean it won't. So decide fro yourselves the best method. Joe Horton, N357CJ
----- Original Message ----- From: "KRnet" <krnet@list.krnet.org> To: "KRnet" <krnet@list.krnet.org> Cc: "Jeff Scott" <jscott.pla...@gmx.com> Sent: Sunday, March 24, 2019 10:11:25 AM Subject: Re: KR> RPM source for use with Dynon Skyview It occurred to me last night while I was working through some wiring diagrams for an ignition problem that I put an error in this advice to Pete. It is always the - (ground) side of the ignition coil that is switched, so it is the - side of the ignition coil that would be used as a tach signal and the equivalent of the "P-lead" from a magneto as a source for wiring the tach signal. I'm surprised about a half a dozen of the scholars here didn't correct me. -Jeff Scott ----------------------------- > Pete, > > I've not wired a Dynon, but in your case, I would assume the + side of an > ignition coil to be the equivalent of the P-lead on a magneto. The voltage on > the primary side of your coil may be a bit lower than the voltage on a > P-lead, but I would use a 30 kΩ "pull up" resistor the same as instructed to > connect a "P-lead" and go from there using the same instructions as outlined > for connecting to a "P-lead", then configure for a 6 cyl engine. The pulse > count should be the same as any 6 cyl Continental or Lycoming firing from a > magneto. > > -Jeff Scott ----------------------------- > _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
