> -----Original Message-----
> From: michael brown [mailto:spam-me@HOUSTON.RR.COM]
> Sent: 07 October 2003 11:16
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE:] Trouble getting enough gain from transistor
>
> Upping the base pullup to 6M7 and lowering the collector pullup to 33K
> is giving me quite a bit of voltage gain now.  Right now a 100mV p-p
> signal will drive the output into clipping.  I would guess that my
> voltage gain now is something close to 100.  This is probably the best
> that I can get without extra components, but the rise time is still
> kinda slow (>150uS to clipping), but the fall time is rather quick on
> the output.  Ideally, I would like the circuit to act as a
> comparator or
> switch with a hair trigger.

This might be a silly question, but why not use a comparator or rail to rail
op-amp?

Mike




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