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Designing a circuit

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Dennis Glaeser

Joined: 10 Jan 2006
Posts: 53
Location: Rochester Hills, Michigan

Posted: Sun Apr 25, 2010 5:03 pm Post subject: Designing a circuit

Joe Gores not only suggested using a reed switch to sense my prop end of travel, he even gave me one to try!  Today I went out and played a bit.  I found that 3 winds of 18AWG causes the switch to close just as the motor starts to strain against the stop.  So I used a dab of Goop to mate the wire loops to the reed switch and used a piece of nylon tubing as a container.  I’m attaching a picture, but don’t remember if those get through on this list.  Doing this was a lot easier than I had imagined.  It work great on the ground, but the weather here in MI was low IFR all day so no flight testing.   

I’ve already ordered the parts for the circuit Bob designed, so I’ll be playing with that soon as well.  I’ll be able to have both methods operating in parallel.  

   

Thanks guys!  

   

                Dennis

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rjquillin(at)cox.net
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Posted: Tue Apr 27, 2010 9:15 am Post subject: Designing a circuit

At 17:55 4/25/2010, you wrote:



  	  Quote: 	
		  Joe Gores not only suggested using a reed switch to sense my prop end of travel, he even gave me one to try!  Today I went out and played a bit.  I found that 3 winds of 18AWG causes the switch to close just as the motor starts to strain against the stop.  So I used a dab of Goop to mate the wire loops to the reed switch and used a piece of nylon tubing as a container.  I’m attaching a picture, but don’t remember if those get through on this list.  Doing this was a lot easier than I had imagined.  It work great on the ground, but the weather here in MI was low IFR all day so no flight testing. 



 I’ve already ordered the parts for the circuit Bob designed, so I’ll be playing with that soon as well.  I’ll be able to have both methods operating in parallel.



  Thanks guys!

                  Dennis 	


 Not sure if this is required or not, but a word of caution from one who's been there.



 I've found, by experience, the glass envelope of reed relays can be fragile and is susceptible to fracture by external forces on the end leads.  As we don't know how yours' is to be secured, just use care to insure no side loads can transfer from the crimped terminals to the interface of the lead and the glass.  



 For me, successful designs have always securely mounted the relay on a board or terminal strip, and had all wires exit from strain relieved terminals; preventing any loads to the reed relay itself.



 Best---



 Ron Q.    [quote][b]

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