M
Michael Noone
- Jan 1, 1970
- 0
Hi - can anybody here tell me if this circuit will work? The idea is for it
to take an input of 0-10V DC at point VIN and output 100 times that at
VOUT. This is the circuit, drawn up with Cadsoft Eagle:
https://netfiles.uiuc.edu/mnoone/www/Electronics/LinearAmplifier.jpg.
Op-Amp is a TI TLC2274: http://www-s.ti.com/sc/ds/tlc2274a.pdf (beware -
fairly large datasheet)
Mosfets are both Internation Recifier IRFBG20: http://www.irf.com/product-
info/datasheets/data/irfbg20.pdf
Before I go any further - I should say that this is pretty much 100% John
Field's design (with some minor modifications by me in the choice of a
higher voltage FET and a higher input voltage) - but I figure I've pestered
him enough so I should post it here instead.
I tried building this circuit today and I ended up frying the op-amp, and
possibly one of the FETs. I'm not exactly sure how that happened, possibly
a short, though my wiring looks fine to me. I'm not worried about it as I
ordered up plenty of both the fets and the op-amps though.
Anyways - what do you all think?
-Michael J. Noone
PS I tried to test this circuit out with LTSpice - but I was unsuccessful.
Can somebody tell me what I'm doing wrong? This is my LTSpice file:
https://netfiles.uiuc.edu/mnoone/www/Electronics/linear amplifier.asc and
this file needs to be in the same directory:
https://netfiles.uiuc.edu/mnoone/www/Electronics/irfbg20.spi
to take an input of 0-10V DC at point VIN and output 100 times that at
VOUT. This is the circuit, drawn up with Cadsoft Eagle:
https://netfiles.uiuc.edu/mnoone/www/Electronics/LinearAmplifier.jpg.
Op-Amp is a TI TLC2274: http://www-s.ti.com/sc/ds/tlc2274a.pdf (beware -
fairly large datasheet)
Mosfets are both Internation Recifier IRFBG20: http://www.irf.com/product-
info/datasheets/data/irfbg20.pdf
Before I go any further - I should say that this is pretty much 100% John
Field's design (with some minor modifications by me in the choice of a
higher voltage FET and a higher input voltage) - but I figure I've pestered
him enough so I should post it here instead.
I tried building this circuit today and I ended up frying the op-amp, and
possibly one of the FETs. I'm not exactly sure how that happened, possibly
a short, though my wiring looks fine to me. I'm not worried about it as I
ordered up plenty of both the fets and the op-amps though.
Anyways - what do you all think?
-Michael J. Noone
PS I tried to test this circuit out with LTSpice - but I was unsuccessful.
Can somebody tell me what I'm doing wrong? This is my LTSpice file:
https://netfiles.uiuc.edu/mnoone/www/Electronics/linear amplifier.asc and
this file needs to be in the same directory:
https://netfiles.uiuc.edu/mnoone/www/Electronics/irfbg20.spi