Alternative voltage control to USB-6009

[loubnaDZ]

Hi everyone,
I am using USB-6009 in order to control the voltage across 5 identical LEDs in parallel through using labview which will be later on used for PID temperature control ( the connection can be changed to series if u suggest any other solutions). Each LED needs 30mA and 5V. The USB only provide a maximum voltage of 5V and 5mA. Is there any alternative NI control hardware that I can use instead of the USB-6009 that is more efficient for generating enough voltage and current for my application? Or if you know of any alternative circuit connection for fulfilling my application?
Thanks 🙂

[Albert.Geven]

The best you can do is to use an amplifier circut that controls current and can be controlled by a voltage.

The voltage control of a LED is highly unlinear and the current control is very linear.

Us a transistor or other circuit to do that. I'm not really handy in sketching this but in principle the transistor ampliifes a current through the base about 100 times. so make sure that for each volt a few microamps go throught the base to the collector.

[JÞB]

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@Albert.Geven wrote:

The best you can do is to use an amplifier circut that controls current and can be controlled by a voltage.

I'm not really handy in sketching this but in principle the transistor ampliifes a current through the base about 100 times. so make sure that for each volt a few microamps go throught the base to the collector.

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You don't need to be handy when Google is around ReadThis

[Albert.Geven]

You are right. Thanks.

[loubnaDZ]

I will try that out thanks so much 🙂