RFFS100 & 4mm pager motor - RC Groups
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May 12, 2003, 10:07 AM
Lapsed Non Modeller
Andycart's Avatar

RFFS100 & 4mm pager motor

Hi Guys

I've been reading up on using 4mm pager motors for control surface actuators instead of the conventional coils and magnets.

Can I connect these directly to the coil outputs on the RFFS100 or will they draw too much current ?

If not, Graham do you stock the right type?

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May 12, 2003, 11:28 AM
Sticky Shepherd
Graham Stabler's Avatar
The RFFS is rated for 50ohm (I think) so just add a resister in series to make the resistance up to 50.



p.s. Will have Didel actuators on my site soon
May 12, 2003, 11:30 AM
Thats NOT indestructible
j8m8l's Avatar

..didel actuators ! Do they come in 200ohm versions?

May 12, 2003, 11:32 AM
Registered User
bselman's Avatar

The RFFS-100 will drive 25 ohms.

May 12, 2003, 11:36 AM
Sticky Shepherd
Graham Stabler's Avatar
Josh, not the ones I am stocking

Bob, Thanks.

May 12, 2003, 11:42 AM
Registered User
dhurd's Avatar
The RFFS-100 is also limited to about 250ma so you will need to be careful if you stall the motor that it won't draw too much current.

May 13, 2003, 05:49 AM
Sticky Shepherd
Graham Stabler's Avatar
If it is 250mA per channel then it can drive 4.2v/0.25A = 16ohm.

Probably better to be safe and go for 25ohm though normally you cannot just measure the resistance of a motor and assume the current it will draw but in this case the motor will be stalled. Still, I would set it up as an actuator with some resistance in series to see what it draws then reduce or increase as nessecery.