Voltage-sample Current-sum

104

00:36:07

CC CE CC
Voltage-sample Current-sum amp
Rf1 = 100kohm
Rf2 = 5kohm
B = Xf/Xo = If/Vo = -1/Rf1

Afr ~= 1/B = -Rf1 = -100kohm
Avo = Vo/Vg = Vo/(Ig(Rg + Ri))*Afr ~= -Rf1/Rf2 = -100kohm/5kohm = -20V/V

Vi = 10mV
Vo ~= Vi*Avo = 10mV*(-20V/V) = -200mV

***Adjust the 5kohm resistor at signal source to increase or decrease overall gain.***

published 8 years ago

cspanbauer

8 years ago

You should turn this in.

crake

8 years ago

It has a frequency response that seems usable, considering the specs he's outlined. With some tweaking, it may just work.

crake

8 years ago

If you meant the led's... he may get a kick out of it lol.

cspanbauer

8 years ago

Yeah, I meant the LEDs. I also finished mine yesterday. I'll post it soon. Do you know if the in/out puts had to be DC coupled?

crake

8 years ago

Yes, he expects this amplifier to be DC coupled. Is the one you made DC coupled?

cspanbauer

8 years ago

Yeah it is. Only cap in circuit is used for frequency compensation.

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