5 Volt relay in place of servo for on-off switch

[hydeout]

Hello, I want to replace a servo & micro switches (too big), with a small 5 volt relay, connected to the servo socket on my receiver. Stick centered, relay off, stick moved to one of the extreme positions relay pulls down. I know it can be done with the addition of a small part or two. Seen circuit somewhere, but can't find it now. :( HELP PLEASE! THANKS, new forum member, Jerry

[patmat2350]

You may find a simple circuit somewhere, but you can buy RC switches all day long that are ready to go... here's a small one that will handle an amp or so on 12v:
http://www.dimensionengineering.com/PicoSwitch.htm

Bigger ones can be had with 2 switched functions...

[johnmca72]

You may find a simple circuit somewhere, but you can buy RC switches all day long that are ready to go... here's a small one that will handle an amp or so on 12v:
http://www.dimensionengineering.com/PicoSwitch.htm

Bigger ones can be had with 2 switched functions...
I'll agree with that. I used to build boards that decode servo pulse inputs & turn stuff on or off, because there weren't (m)any commercial options then. There are, now, & it really isn't worth the time & trouble to build them anymore. It takes a little more than just a relay, but not all that much. I used to build circuits with a dual 555 one-shot, a couple of transistors, a couple of solid-state relays, 2-3 resistors, & a couple of capacitors. Total parts, maybe around $10, but when you add the value of my time, just to solder the thing together, it's still cheaper to buy off-the-shelf, ready to use.

If you still want to do it yourself, just because it's fun or whatever, do a google search for "servo tester" or "servo switch" & you'll find plenty of adaptable circuits.

JM

[mfr02]

The other alternative is to take one cheap servo (or one with a dead motor/gear train) disconnect the motor and wire the relay coil in its place, or two relays and diodes for centre off, one forward, other reverse.
Again, as johnmca72 said, there is probably very little in cost terms between a home build/mod and shop-bought ready to go, apart from the sense of achievement and bragging rights.

[PatricMichigan]

Hanson Hobbies also makes a switch to do this. http://www.hansenhobbies.com/products/onboardacc/mers/ is the link.
I've seen and talked to them the last couple years at the Toledo show. I have one but haven't yet put it into service.
Patric