Servo Amplifiers

[g4uvz]

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

[skyscraper]

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

[g4uvz]

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

[skyscraper]

[...]
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

[g4uvz]

OK Thanks for the info
A