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Old 29th January 2011, 12:34 AM   #1
codegen is offline codegen  Norway
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Default +-70v and opamps

Hi all!

Not really sure where to put this, but ill try here since it is signal level.

I would like to power up a opamp using my amplifiers power lines, it has +-70v and the opamp have max +-18v. Could i use a voltage divider to get the nessecarly voltage? Or maybe use a voltage divider to get the level down to around +-30 volt and then use some voltage regulators to regulate to +-15v? It is to use for a push and pull amp to split the signal, BB DRV134 device.

Thanks
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Old 29th January 2011, 12:47 AM   #2
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Resistor and zener diode shunt will do it for you. Mind the drop across the resistor (52V if you use an 18V zener) and make sure it is properly sized.
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Old 29th January 2011, 01:52 AM   #3
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There are three-terminal regulators available in 15 V ratings, both positive and negative.
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Old 29th January 2011, 02:02 AM   #4
codegen is offline codegen  Norway
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MJL21193: Okey, i will most likely go for this solution..

bob91343: Yes, i have a couple of L7815 and L7915, but those are specified to handle 70v..
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Old 30th January 2011, 11:14 AM   #5
jazz35 is offline jazz35  Romania
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Take as an example this schematic...
Vicol-audio "Quasar amplifier"
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Old 30th January 2011, 12:36 PM   #6
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On my website I have a project - high voltage differential regulated PSU for op-amp circuits - that is designed for your problem
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