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Author Topic: Servo Amplifiers  (Read 3598 times)

g4uvz

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Servo Amplifiers
« on: December 20, 2014, 08:50:00 PM »

In the good old days when I built up servos from kits there were a few firms about selling servo amps ..I have 4 EFLR 7145s all with dead amps ..following an over voltage experience !  Not bothered about a didgital amp ..a good old analogue would be fine ..bu no one seems to sell these nowadays?

Adrian
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skyscraper

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Re: Servo Amplifiers
« Reply #1 on: December 21, 2014, 11:48:39 AM »

Basically Servo Amps died out since microcontrollers can do the job. I designed one once!
http://www.zoomworks.org/oldsite/Winch/BoardElectronics/uber_frame.htm

You can still get the analog ones on Ebay e.g ZN409, but very pricey...

http://www.ebay.co.uk/itm/ZN409E-Integrated-Circuit-/400360781666?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item5d375cb762

Alternatively have a look at Openservo

regards
Andy

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g4uvz

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Re: Servo Amplifiers
« Reply #2 on: December 21, 2014, 06:17:45 PM »

Thanks Andy for the info ..yes i have some of the Ferranti chips some where!  but they are just a bit too big for my application ...Its a shame maunfacturers dont sell spares for the higher end servos ...throw away society in which we live!
hand a look at the servo site ..but the input seemed to have more than 3 wires !  too many for me!

A
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skyscraper

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Re: Servo Amplifiers
« Reply #3 on: December 21, 2014, 06:35:34 PM »

[...]
hand a look at the servo site ..but the input seemed to have more than 3 wires !  too many for me!

A

I dont think you have to use 5 wires. The standard RC servo input is only a pulse where position is a simple function of pulse duration so trivial to do ...

Anyway says it is supported..
http://openservo.com/ServoSignaling

regards
Andy

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g4uvz

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Re: Servo Amplifiers
« Reply #4 on: December 21, 2014, 11:45:16 PM »

OK Thanks for the info
A
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