Re: BJT Pair for Push-Pull, 1W, 33V, 200mA, 1MHz (& maybe no heatsink)?
- From: "John Jardine." <john@xxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 7 Jul 2006 21:29:00 +0100
<tomg@xxxxxxxxxxx> wrote in message
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John Jardine. wrote:[...]
<tomg@xxxxxxxxxxx> wrote in message
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made,
Seems like the power output stages of every Function generator ever
use the 2N2219-2N2905 pair.
john
John,
Good call!
I had looked at those, first, after no TO-92-cased models seemed to be
quite up to the task. And just this morning I tested 2N2219A and
2N2905A (metal can TO-39 cases) in the circuit and.... it looks like
no heat sink will be necessary (well, maybe for the 2905A; but only a
small one. I'd probably stick one on both, anyway, if there's room.).
I'm guessing that maybe they will also operate down to lower currents
than larger devices. Or is that way off?
Thanks!
Tom Gootee
You should have little problem controlling signals down to the prevailing
noise. Courtesy of available loop gain and offset voltage of that input
opamp.
Reading the words I get a gut feeling that the circuit has somehow run out
of gain.
It's awkward (I'm idle!) to mentally reconstruct your circuit description.
Any chance you could put the relevant part of the drawing up somewhere, then
maybe all the lads can have a perusal?.
john
.
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