Thread: servo control vs stepper control
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14-09-2012 #1
Last Activity: 27-04-2020
They are 1K.
Originally Posted by irving2008
The problem I have with running this BOB at 24v is this:
The output circuit has a pull up to 'Isolating + supply'. Without knowing the value of that resistor you can't be 100% sure its not going to fry. In the manual it shows 'Isolating Supply +5v'so I would assume they are sized for 5v and not 24v supply...
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14-09-2012 #2
Last Activity: 17-03-2017
Originally Posted by boldford
Ok, so 5mA collector current on 5v, 24mA on 24v.. so it wont fry :)
EL817 optos are rated 35v, 50mA so should be ok.
However, as I recall the diode has a 330R series resistor so forward current is about 10mA and those devices have a transfer ratio of about 1.1. So with 10mA in the diode the collector current is going to struggle to be more than 11-12mA which means the output volts wont drop below about 12 - 13v, so though it won't fry its not going to work. No good on 24v :(
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