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Electronics problem (LOG)

Guscat · 2008-10-06 10:06:08

Hello all, I have a problem in relation to logarithmic amplifiers. I am trying to input exponential voltages (eventually pulse peaks) of 10, 20, 40, 80, 160, 320, 640, 1280, 5120 mv etc.. and get a linear response (or those values logged). I have a simple circuit with resistor, op-amp and tran NPN. I also have an AD8307…

06-10-2008 10:06am

#1

Guscat

Registered Users, Registered Users 2 Posts: 71 ✭✭

Join Date: October 2005

Posts: 43

Hello all,

I have a problem in relation to logarithmic amplifiers. I am trying to input exponential voltages (eventually pulse peaks) of 10, 20, 40, 80, 160, 320, 640, 1280, 5120 mv etc.. and get a linear response (or those values logged).
I have a simple circuit with resistor, op-amp and tran NPN. I also have an AD8307 log amplifier. However the output is not as expected. Can anyone let me know of a simple circuit that might sort this.

Thanks.

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