Re: Line-out replacement for piezo speaker
- From: "Roger" <irwin@xxxxxx>
- Date: 6 Jun 2006 08:59:34 -0700
Arild P. wrote:
I have this electronic talking toy with a "ceramic speaker" (or
whatever it's called) and want to create a line out socket so I can
connect it to an audio system, but I'm having problems getting a good
sound.
Your best bet would probably be to use an op-amp 'integrator' circuit.
Take a conventional inverting op amp circuit and place a capacitor in
paralell with the feedback resistor. the input resistor should be
connected to the speaker wire via a capacitor (use +/- supplies on the
op amp. Use 100K for the input resistor and vary the feedback resistor
to get the desired gain. The integrating capacitor should be such that
C * Rf is appox 0.0001
Once you have the gain about right by juggling the resistors (should be
1V p) you can juggle the capacitors. A smaller coupling capacitor gives
less bass. A bigger feedback capacitor gives less treble.
.
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- From: Arild P.
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