Motor timers for electric FF

[Ian Easton]

I want to convert some of my vintage models and designs to electric but need a timer to limit the motor run and perhaps operate a D/T.

Does anybody know of one?

I saw in the FF forum that they were talking about a Charlie Hendrickson timer but I couldn't find any information on one. I don't know if it will handle 280, 400 motors or what.

I would like to build my own timer if possible - does anybody have any plans or instructions?

Ian

[Joe41]

Ian go to the DIY Electronics Forum and ask, you would'nt believe the wealth of knowledge of the people in that forum.
Joe

[vintage1]

I would have thought a couple of transistors and resistors and a large capacitor would have done the job. Take it over to the electronics...see U there :)

[Ian Easton]

Thanks guys, I didn't think to look there. I spend most of my time in the scale area.

Ian

[vintage1]

I have put together a circuit diagram and posted it in teh electronics forum for them to tear the design to pieces.

:rolleyes:

In keeping with the vintage style, it is pure analogue design...so no PIC programming needed. :D

Its likely to be fairly temperature sensitive...it relies on one large capacitor of very variable tolerance to get the timing right, so for competition use its possibly a bit too sloppy. Dethermaliser is not included, but could be done with a similar circuit.

http://www.rcgroups.com/forums/showthread.php?t=229273

[bolmas]

you can make a timer from a ksb engine timer.make a plunger to fit into the fuel cutoff slot and then put a micro switch underneath. when the timer arm comes round it presses the plunger and switches the motor off.

alternatively a tomy timer could possibly be adapted so instead of d/t it would press on a microswitch.

for d/t use a fuse its never failed for me!

[Ian Easton]

Thanks guys.

In regard to using a fuse I know what you mean about reliablitity, however have you seen the fires out here in California lately - I don't want to be responsible for one. This place is so dry it's like a powder keg ready to blow. I think we only had 6 days of rain in the last year and they were pretty wimpy rainy days at that.
I like the converting a timer idea too as I have one of the Ksb ones.
I 'm also interested in fiddling with an electronic version too.