<html><body><div style="font-family: Arial; font-size: 12pt; color: #000000"><div aria-label="Compose body">I have a "Benched" N2 gauge out of a 737 that runs on a single Teensy PWM output. If yours is anything like mine, the PWM signal has to switch polarity (Go Negative) during a full cycle. I simply added a 0.1uFD ceramic cap in series on the PWM output and the Gauge input.</div><div aria-label="Compose body"><br></div><div aria-label="Compose body">-Ray </div><div><br></div><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"David C. Allen" <dca911t@gmail.com><br><b>To: </b>"Simulator Cockpit Builder's List" <simpits-tech@simpits.org><br><b>Sent: </b>Monday, August 7, 2017 3:16:18 PM<br><b>Subject: </b>Re: [simpits-tech] N1 & N2 Gauges<br><div><br></div><div dir="ltr"><div><div>Hello Matt<br></div>Wish I could find the overhaul manuals ! ! ! !<br><div><br></div></div>David<br><div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Aug 7, 2017 at 1:53 PM, Matt Bailey <span dir="ltr"><<a href="mailto:dabigboy@cox.net" target="_blank" data-mce-href="mailto:dabigboy@cox.net">dabigboy@cox.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex" data-mce-style="margin: 0 0 0 .8ex; border-left: 1px #ccc solid; padding-left: 1ex;"><div><div>It's pretty straightforward. You can do this with just an Arduino and one of the cheapo L298N H-bridge boards on ebay. I did it very crudely and easily, and ended up with poor control below about 30% RPM (on my particular indicator), but totally smooth response above that. Another fellow I know adapted a sine wave approach that used the Arduino's PWM channels, which gave good control all the way down to 0.</div><div><br></div><div>Check out the overhaul manual for your indicators. You're basically building a brushless speed controller.</div><div><br></div><div>Matt</div><br></div></blockquote></div><br></div></div></div></div></div><br>_______________________________________________<br>Simpits-tech mailing list<br>Simpits-tech@simpits.org<br>http://www.simpits.org/mailman/listinfo/simpits-tech<br>To unsubscribe, please see the instructions at the bottom of the above page. Thanks!</div><div><br></div></div></body></html>