Re: TIS98 and TPS98 transistor questions

>I wouldn't worry about it, I doubt anyone sells a small signal
>transistor that would be too slow. The only way you would have speed
>problems (or gain problems for that matter) is if you tried to use some
>old slow power transistor like a 2N3055. Those are the same case style
>as the 2N3716/2N3792 output transistors --- not much danger of anyone
>using those for preamps.

Not likely is it, given the difference in shape, size, looks, etc. :)

>You CAN have too much gain, if you put a darlington transistor
>with a gain of 10,000 in there the circuit might get squirrelly. A
>darlington in the Q703 position wouldn't work at all in this circuit.
>But for differential amplifier use a gain of 100 to 500 should be fine.
>Just be sure to use the same part as the transistor pair (Q701/Q702 in
>my example).

Thanks, no problems there seeing as I swapped them all out.

You've been most helpful, no doubt to others here as well as myself, many
thanks. :-)

Regards,
Phil

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Received on Tue Jan 22 01:55:19 2002