Electronics > Beginners
Exponential Amplifier
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eev_carl:

--- Quote ---bipolar supply?
--- End quote ---

It's split.  I threw in a resistor instead of the diode and ran in a sine wave to verify the 741.
eev_carl:
I reversed the BJT and get these outputs.  It seems like i might not be operating in the correct range.  Maybe I'm missing an offset?  Nothing interesting happens until about 10V.

VinVout10mV1.5mV100mV1.5mV1000mV1.5mV10000mV22.6mV
Alex Nikitin:

--- Quote from: eev_carl on July 24, 2018, 02:25:18 pm ---I reversed the BJT and get these outputs.  It seems like i might not be operating in the correct range.  Maybe I'm missing an offset?  Nothing interesting happens until about 10V.

VinVout10mV1.5mV100mV1.5mV1000mV1.5mV10000mV22.6mV
--- End quote ---

 :palm:

The input should be negative polarity... and please limit the current on the input by, say, 10mA.

Cheers

Alex
eev_carl:
Here's what I get with negative polarity

VinVout-10mV1.5mV-100mV1.7mV-1000mV8.22V-10000mV8.16V
The current is >5mA for Vins >1V.   Should I put a 220ohm resistor in series?


Alex Nikitin:

--- Quote from: eev_carl on July 24, 2018, 02:33:51 pm ---The current is >5mA for Vins >1V.   Should I put a 220ohm resistor in series?

--- End quote ---

It could be too late for it - if you've really managed to apply 1V and 10V voltage to the input... .

Cheers

Alex
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