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Installing a landing light blinker in an Archer
A while back I asked for information about installing a landing light
blinker system in an Archer. Now that the job is done I'll share my experiences with the Great Planetary Bit-Bucket. First off, I'm very pleased with the system. I want Jim Weir to know his generosity was not in vain! Thanks again, Jim. Jim supplied the 2 field effect transistors with electrically insulated heat sinks and the two surge current limiting thermistors along with a schematic. The rest of the stuff came from Radio Shack and another local electronics store. The particular question in the Archer was how to hook up the pulsed output across the landing-light switch. Since the LL rocker is essentially inaccessible to everyone except the original assembly workers at Piper, I ran a 16 gauge wire through the firewall to the LL connector in front of the firewall and replace the two wire connector with a three (actually four) wire connector to splice in the 12 volt pulsed output. The other head-scratcher was were to place the thermistor since Jim suggested it would be better to get it out of the cockpit. It ended up on a small piece of circuit board screwed to one side of the LL. It essentially became part of the wire that gets taken on and off when the bulb needs changing. The one slight mod I did to Jim's schematic was to add 500 ohm resistors in series with yellow LED's on each pulsed output so the blink rate is visible in the cockpit. A side benefit of the LED's is that when the LL switch is on, the LL LED is also on, even when the pulse system is turned off. If the pulse system is also on, the LED stays on without blinking. -- Best Regards, Mike. http://flickr.com/photos/mikenoel/ |
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