Re: Apple II preamplifier

["Simon D. Williams" <bb065@chebucto.ns.ca>]

On Mon, 5 Dec 2005, Michael J. Mahon wrote:

> Simon D. Williams wrote:
> > On Sun, 4 Dec 2005, Simon D. Williams wrote:
> > 
> > 
> >>For reasons that probably should remain a mystery, I'm trying to
> >>"cross-over" the cassette I/O ports on a pair of IIes... the immediate
> >>problem is that the output is at line level and the input expects a much
> >>higher level, so I need to amplify the signal. Is it possible to make a
> >>very small amplifier to achieve this?
> > 
> > 
> > Forget that last sentence... obviously it's possible. The question should
> > be: how can it be done simply and cost-effectively?
> 
> If you'd rather buy the parts at Radio Shack than buy the
> assembled unit, then you are looking for a microphone
> pre-amplifier circuit.  Google should turn up dozens,

Indeed... Google is more helpful than I could possibly want -- didn't
realize there were so many variations on such a simple thing.

> and you can take your pick--discrete transistors, IC op-amp,
> single-voltage supply, split supply, etc.
> 
> Frankly, unless you really like to build things, buying a
> pre-amp or mic-input mixer--or picking up a used cassette
> recorder at Goodwill--is the simplest way to go.

Good point.


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