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02-11-2012 11:21 AM | |
ErikTheRed |
Re: Servo Electronics Question Thanx JJBANNER and ofcourse Mr Van Roon for a wealth of information. Just not enough time to completely peruse all the information. ErikTheRed |
02-09-2012 07:36 PM | |
Spitball |
Re: Servo Electronics Question Thanks JJBANNER, I wondered where it had gone - I presumed he had left U.of Guelph. |
02-09-2012 09:54 AM | |
rbwater |
Re: Servo Electronics Question JJ, Thanks. Looks like a very cool site for detailed review when I have some time. RB |
02-09-2012 08:02 AM | |
JJBANNER |
Re: Servo Electronics Question Tony Van Roon's excellent collection can be found at: http://www.sentex.ca/~mec1995/circ/circuits.htm |
02-02-2012 11:21 PM | |
rbwater |
Re: Servo Electronics Question John, Thx for the info. I have one of the HK ones with the flashy blue LEDs. I needed to build one so I could modify it to make it move the servo arm from one end to the other when a micro-switch closes. I am installing it to raise & lower a cutting head on a home made cutting device. RB |
02-02-2012 05:17 PM | |
JSUTHERLAND8 |
Re: Servo Electronics Question For $3 on Ebay you can buy a servo tester, that has a "0" center mode, run test, and manual adjustment with a pot. Hobbyking also has one, and some have a switch so they run the servo from 90% end to end, on power up. Some will drive up to 3 outputs, with nice blue flashy LED's. |
01-15-2012 03:11 PM | |
Spitball |
Re: Servo Electronics Question I feel I must point out that the circuit is not original but lifted from an excellent site by Tony van Roon, that was on a University of Guelph site that doesn't seem to be up anymore. A pity as it had dozens of good circuits and was very useful. I for one miss it as a reference. |
01-15-2012 12:34 AM | |
rbwater |
Re: Servo Electronics Question Well finally I have a working servo tester. Many thanks to Spitball for his help & for the attached schematic. I modified the circuit I had constructed from the schematic I originally obtained to match Spitball's version. It is very similar with some different resistor / capacitor (1) values & a couple of connections but this one works whereas I could not get a proper response from the original. RB |
01-02-2012 09:19 AM | |
bobreib |
Re: Servo Electronics Question Try changing the transistor to this configuration .. |
01-02-2012 08:46 AM | |
Spitball |
Re: Servo Electronics Question Hi Rob - yes, this is like the classic circuit employing a 555 IC but there is something screwy about the circuit there! I'll go further into it but I think there is definitely an error here, as the supposed emitter follower seems directly across the servo Vcc line! Diode not really needed and as you found, LED in the wrong place, both reducing the Vcc the 555 is getting. CvL |
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