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Old 7th April 2002, 09:17 PM   #1
JoeBob is offline JoeBob  Canada
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Default Inverting

I've got two small signals, one I want to run through a voltage amplifier (not much gain, maybe 4 or so), and the other one I want to do the same thing, but invert it. I'd like to go discrete for this, with BJTs or JFETs. Now I know how to do it with opamps, but how would I go about it with discrete components?
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Old 7th April 2002, 09:48 PM   #2
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JoeBob,

Take a look at the second schematic of the thread below and read a little further. If you take the inverting and non-inverting outputs of this preamp they'll both be offset by about +50mV but that should do the trick. If the 50mV offset is too much you could capacitor couple them.
If you were to use the third schematic you would definitely have to capacitor couple the outputs since the offset is about -15V each.
However, if you were going use it as a balanced preamp as I have, you wouldn't have to couple the outputs. (R21 represents the load, which would be the power-amp)

Good design practice

Stephen
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Old 7th April 2002, 10:01 PM   #3
JoeBob is offline JoeBob  Canada
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Thanks, I'll read through that.
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Old 7th April 2002, 10:11 PM   #4
paulb is offline paulb  Canada
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Also suggest you look at Pass' Balanced Line Stage and his article on building your own opamps. www.passdiy.com
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Old 7th April 2002, 10:13 PM   #5
JoeBob is offline JoeBob  Canada
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I was thinking of just using DIY discrete opamps (a la Nelson Pass article), but didn't know if there were better ways...
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Old 7th April 2002, 10:15 PM   #6
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What! First I have to send you the parts, then you ask for Spice models. Now you want me to design it too? [joke]

I take it that they haven't arrived yet.

Jocko
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Old 7th April 2002, 10:17 PM   #7
JoeBob is offline JoeBob  Canada
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LOL, no, not yet. But silly me, after starting to read the BOSOZ article I see how I can do it.

And NO, I didn't want anyone to design it for me, just wanted some pointers in the right direction .
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