Electronics > Beginners
Exponential Amplifier
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
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version