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Audio circuit implementation - help or e-books needed

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wafer101

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Audio circuit needed

Hello guys I would appreciate some help from your side. I need to implement an audio circuit that doubles the incoming signal frequency, that is f(t) => f(2*t) for any frequency and any kind of signal, not just a fixed one for that I could use a tuned class C amplifier.
I am interested also in the theory beyound this circuit. I would applreciate also some e-books on the analog circuit design and audio Fx.
Thank in advance...

Wafer101.
 

flatulent

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squaring circuit

If you use an analog multiplier and feed your signal into both inputs you will get a double frequency output and a DC output. Capacitor coupling will eliminate the DC. These chips go by MPY pefixes. The old Burr Brown now bought by TI has some. Here is one http://www-s.ti.com/sc/psheets/sbfs017/sbfs017.pdf

If you want a cheaper form, use a full wave rectifier. Put the signal through both an inverting gain and a noninverting gain amplifiers. Put diodes from these outputs to the inputs of an inverting stage with two resistor inputs. this will get you mostly second harmonic output.
 

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