According to the data sheet, it will depend on the power supply voltage to the LM1458. The maximum input voltage to the LM1458 is equal to the power supply voltage up to a maximum of +/- 15 volts (the power supply voltage can be up to +/- 18 volts).
That link was to "whet your whistle", just to give an insight as to how the poblem could be solved. RDL2004 expanded on the possible range of voltage.
The reference side of the comparators could be fed by D/A converters making the reference voltages programmable, or, voltage dividers could be used and thereby be fixed.
I would engourage you to look up "window comparator"; they are really quite useful.
As a volunteer,I am building a bicycle driven generator project for the local children's museum. At a 50 watt load I can see the voltage vary from 0 to about 30 volts dc. After 50w increments to 250w I can get about 12 volts out. I don't want the kids to burn out the 12v lamps I use as loads when they pedal at high speeds and low loads. I am programming the loads to step up on a timed basis but, at low loads there is the danger of overvoltage.
I am considering large capacitors to even the voltage fluctuation that occurs in each pedal rotation.
Avadoggie
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http://www.google.com/imgres?imgurl=http://www.ecelab.com/circuit-window-comp.jpg&imgrefurl=http://www.ecelab.com/circuit-window-comp.htm&h=282&w=480&sz=24&tbnid=NeJ6Pwzm1c6X9M:&tbnh=76&tbnw=129&prev=/images%3Fq%3Dwindow%2Bcomparator&hl=en&usg=__IExpsfEV1stZ1CuScu3C2Eo2pT4=&sa=X&ei=vZ4XTLzBKd_tnQfbupDCCg&ved=0CCQQ9QEwAw
If that link doesn't work, search for "window comparator".
Regards,
DJ
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- Rick
That link was to "whet your whistle", just to give an insight as to how the poblem could be solved. RDL2004 expanded on the possible range of voltage.
The reference side of the comparators could be fed by D/A converters making the reference voltages programmable, or, voltage dividers could be used and thereby be fixed.
I would engourage you to look up "window comparator"; they are really quite useful.
Regards,
DJ
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Thanks again.
As a volunteer,I am building a bicycle driven generator project for the local children's museum. At a 50 watt load I can see the voltage vary from 0 to about 30 volts dc. After 50w increments to 250w I can get about 12 volts out. I don't want the kids to burn out the 12v lamps I use as loads when they pedal at high speeds and low loads. I am programming the loads to step up on a timed basis but, at low loads there is the danger of overvoltage.
I am considering large capacitors to even the voltage fluctuation that occurs in each pedal rotation.
Thanks,
Bill