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-   -   +-70v and opamps (http://www.diyaudio.com/forums/analog-line-level/182077-70v-opamps.html)

codegen 28th January 2011 11:34 PM

+-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

MJL21193 28th January 2011 11:47 PM

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.

bob91343 29th January 2011 12:52 AM

There are three-terminal regulators available in 15 V ratings, both positive and negative.

codegen 29th January 2011 01:02 AM

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..

jazz35 30th January 2011 10:14 AM

Take as an example this schematic...
Vicol-audio "Quasar amplifier"

richie00boy 30th January 2011 11:36 AM

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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