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Old or broken Servo Modification

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Old 07-16-2004, 12:35 PM
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georbeckha
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Default Old or broken Servo Modification

Hi Everyone,

A while ago I saw an article on modifying an old or broken servo to an on/off switch. Now I want to try it I can no longer find the details.
My problem is I cannot remember where if I saw it here or on someone elses web site.
Does anyone have any ideas? (It is possible that I may have been smoking my bathwater when I came up with this as well)


Any information would be helpful.

Thanks Everyone
George
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Old 07-16-2004, 07:33 PM
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pilotkelowna
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Default RE: Old or broken Servo Modification

George:

The article is in the June 2004 issue of RCM. Sorry, don't have a scanner so I can't send to you, but I'd bet another RCU member can get to you.

Brian
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Old 07-17-2004, 05:43 AM
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Default RE: Old or broken Servo Modification

Brian,

Thank you thank you thank you. I knew I'd seen it somewhere but couldn't find it anywhere online.
I dug the June 2004 issue of RCM out and opened it to page 42 and there it was. PERFECT! (I just found out that I can do something with those old stripped servo's I have lying around) Especially those ols 5g to 20g servo's that never really worked that well for me. A Cheap lightweight onboard glow system.

You're the best. Thanks again.

George
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Old 07-18-2004, 08:08 AM
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Default Old or broken Servo Modification

I don't get RCM. How can you use a servo for an onboard glow system_bob
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Old 07-19-2004, 02:00 PM
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Default RE: Old or broken Servo Modification

Bob,

Actually it is quite simple. (Well, I am hoping it is anyway)

You open the back of the damaged or old serveo (Can use new if you want) and de-solder the electric motor from the rest of the servo. (This is the motor that runs the servo gears) Attach a wire to where the motor was attached to the circuit board and run it to a small relay. When you activate the servo the signal goes to the relay to close a normally open switch. This is in effect using the old servo as an on/off switch that you can operate pretty much well anything (From landing gear lights to remote onboard glow driver)

For the glow driver all you'd need is a circuit from the relay to the top of the glow plug and from the engine (Say from one of the mounting screws. As long as it is touching some part of the engine) to the other side of the relay with a 1.5v battery (Or a 1.2v NiCd battery) so that when the servo is activated it closes the relay (Switch) and the power is supplied to the glow plug.

If anyone else wants to add or elaborate please feel free to do so (I even welcome corrections here)

This is pretty simplified but is basically how it works.

George
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