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Subject: Powering a +/-40V op amp with multiple +/- 25V supplies

Date: 10/28/02 at 11:24 PM
Posted by: alan
E-mail: abbarr@yahoo.com
Message Posted:

Hello all,

I am trying to power a high voltage op amp with power from a wall socket. I have purchase two used +/-25V, 200mA transformers. The sum of these two is too high for the op-amp so i would like to use a voltage divider circuit to bring the supply voltage down to around 35. The op-amp is a dual power supply op amp. The problem as i see it is that the voltage divider circuit uses ground as a reference to some Vin, instead of the + and - Voltage that this transformer is working with. My question is, is there a simple linear circuit design I could use to drop this voltage down to the target 35, while still using the dual supply nature of the transformer which my op amp requires. If i use the ground wire as my reference, the voltage is obviously cut in half and it would take 4 of these transformers to meet the voltage requirement. Is there a more appropriate transformer available? I hope this query makes sense and that a solution is at hand. Thanks in advance for any assistance. alan.

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