Deni,
Actually it has already been done.
Tom Hammond has a design with minimum components on his website that
uses a TDA2003 audio chip. Look in the General Amateur Radio files
section at www.n0ss.net. That is the one I am using. Plenty of audio.
I am driving it into two paralleled 5 inch woofer 9 ohm speakers and it
works great and I switch in a 'tweeter' which consists of the same
speaker used in the K2 (Jameco 99996) when I want more high frequency
response for SWL Broadcast listening - my 'tweeter' is connected with a
series 40 uF non-polarized capacitor. My woofers were a special buy
that I made many years ago and are not readily available, so my speaker
setup is not readily reproducible.
My prior amplifier used only one of the 9 ohm speakers and also worked
fine. More power is available with lower impedance speakers (or in my
case a paralleled pair).
The frequency response will depend on your speaker choices and the
enclosure - a bit of experimenting may be in order to obtain what you
want to hear. A metal enclosure and ferrite beads on the inputs can
produce the RF Proofing, but I use a wood cabinet with the speakers to
control resonance effects. The electronics can be inside a shielded box
if you encounter RF problems.
Maybe someone will come up with details of an enclosure design using
available speakers.
73,
Don W3FPR
F5vjc wrote:
So, how about someone comming up with a good communications quality
amplified speaker and enclosure design, RFI proof of course!
I would build one...I believe there was/is an Elecraft design but it
looked overly complex...
Anyone care to suggest a suitable audio chip, speaker and enclosure?
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