R/c Remote Power Switch

[bitusbates]

Hi,

Anybody have got the schematic for I will do it ??

Thanks

David Méndez aircraft23@gmail.com

[malibus]

probably this?
http://www.rc-cam.com/bitsw.htm

[AndyOne]

If you don't want to get into PICs then try this just good old fashioned components.

Andy.

[Tomapowa]

A few other discrete-component R/C switces... including my mod for shutter control of the Aiptek camera...

http://www.uoguelph.ca/~antoon/gadgets/rc-sw.gif

My new PIC-based "Maxi-Switch" (10+ amp loads) is pending...
http://www.laureanno.com/RC/maxi-switch1.gif

[kribe]

Hi!
I have made several R/C Switches using the 4013 chip. It works great. BUT it will not work with Futaba´s FASST reveivers without an amplifier for the signal. Easy made with 2 NPN transistors and 4 resistors.

//Christer

[AndyOne]

The signal voltage thing is why there is a MOSFET buffer in my circuit. To make it more sensitive this could even be substituted with a bipolar transistor if the input capacitor is changed for a resistor about 1k should do, it may also be sensible to lower the 1M resistor to about 10k.

Andy.

[andro000]

Hi y'all

Can a switch of sorts be fashioned out of the guts of a servo? Specifically a Hitec HS-55?

[Ron W3FJW]

Not likely as the servo is analog whereas a switch is digital. Unless of course, you want to add additional electronic circuitry such as an AD converter.

[andro000]

Well, what about controlling something like a SMT and (or) solid state relay? Perhaps to control a set of lights?

Am I OT for this thread?

[Ron W3FJW]

You could glue a mini micro switch or leaf contacts on to the servo case that could be actuated by a servo arm.

[andro000]

I am afraid I am not making my self very clear.

I have only the guts from two HS-55 servos. I would like to make a switch or two that can be activated via my Tx for extra flight activities. Lights, mini paratroopers, play bombs, smoke, etc.

After posting my first reply I think I may have it.

Lights (LEDs) Measure the DC that goes to the servo motor while adjusting the pot to different points. After finding an appropriate power level replace the pot with a resistor or two of the found value. One could also set up a socket so the resistors can be easily removed for a variety of uses of the unit.

Yes the above will probably be a bit low in watts. I think It should be enough to make something do some thing else.


Any more application ideas? Any thoughts on the specs. for such a system?

[shanghai_fool]

Sure you can. Disconnect the motor. Center the pot or use a couple 2.2-2.7k resistors. One motor contact will source 4.8V at about 1 Amp when control is in one direction. The other motor contact will source 4.8V when the control is moved in the opposite direction. You can use a small relay if you need isolation or different voltage. A center off will be more of a problem.

[AndyOne]

Don't forget that servo amplifiers have a dead-band so you could find a centre-off position with careful adjustment.

Andy.

[shanghai_fool]

This is true and would require a pot instead of the resistors however some servos output battery voltage to both motor outputs when servo bridge is balanced. It depends on the circuit and whether the output transistors are switching to battery or ground. Most circuits use "H" bridge where there is a transistor (FET) on each side.


Donald

[andro000]

Nice info. Thank you all!