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Subject: D/A card providing max of 2mA, need more current.

Date: 11/08/02 at 6:07 PM
Posted by: alan
E-mail: abbarr@yahoo.com
Message Posted:

Hi,

preface:

somewhat a novice at this, so please excuse the evidence.

Problem:

I have a digital to analog card that produces a maximum of 0 to 10V with a maximum current output of 2mA. This signal is coming from a digital function generator that allows the user to create various pulse trains. The signal is going into a non-inverting opAmp circuit used to double the voltage at the final terminals. The resulting voltage is from 0 to 20 volts open loop depending on the orginal signal from the D/A card. I have a load of approximately 45 Ohms, which when connected across the opAmp terminals, drops my voltage down to 1V. I need to deliver from 0 to 25mA to my device.

Questions:

1: can I use some sort of capacitive circuit to increase the final current delivered to my device.

2: am I in over my head or does this sound fairly approachable for a novice?

Does anyone have a suggestion for an alternate method of meeting my device objectives?

Thanks in advance, alan.


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