Re: What's difficult in DIY audio?

On May 29, 10:55 pm, John Byrns <byr...@xxxxxxxxxxxxx> wrote:
In article <1180491734.775980.124...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Peter Wieck <p...@xxxxxxx> wrote:

On May 29, 4:28 pm, robert casey <wa2...@xxxxxxxxxxxxx> wrote:
For some real fun, build a high performance FM tube tuner from scratch.
Getting 100MHz circuits to behave is another ballgame.

There is a crystal FM tuner out there. I wonder if it is powerful
enough to drive a multiplex adaptor...

Probably not, hows that for an understatement, if the multiplex adapter
has to get all its power from the crystal FM tuner, but it could easily
drive a multiplex circuit that had its own power source.

Regards,

John Byrns

--
Surf my web pages at, http://fmamradios.com/

John:

I have two MPX adaptors. Both of them plug into the wall
independently, and take a simple mono "line in" from a monaural tuner
and provide a stereo line-out from that. If you are thinking of on-
board units, I would tend to agree with you depending on where they
were in the circuit.

http://www.mcmlv.org/Archive/HiFi/EicoMX99.pdf This being one of two
similar as mentioned above.

But I am thinking that a crystal radio may have other issues rather
than actual power-out difficulties. Such as either too narrow a
reception or not selective enough. It would also be simple enough to
make a one-transistor (or one-tube) amplifier for the crystal set if
more output voltage was required.

But if possible, it would certainly be a minimalist design.

When I next get some bench time (summer is hard on this sort of
thing), I might just try and see.

Peter Wieck
Wyncote, PA

.

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