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-   -   Amplifier with a sound. How to build for second harmonic. (http://www.diyaudio.com/forums/solid-state/223690-amplifier-sound-how-build-second-harmonic.html)

lineup 16th November 2012 02:08 PM

Amplifier with a sound. How to build for second harmonic.
 
What can I technically do when designing an amplifier to make it add plenty of second harmonic?

Create distortion is not too difficult.
But to generate mostly 'earfriendly' second harmonic - how do we do this?

I have one suggestion.
It is wellknown that big MOSFETs generate some 2nd.
But more specifically how do we add them?
How do we build?

Give from your experience and tell me.
Thank you.

jcx 16th November 2012 02:11 PM

Class C?

freax 16th November 2012 02:13 PM

Build a tube amp/use a 2n3055.

DF96 16th November 2012 02:59 PM

Single-ended Class B will give you lots of 2nd.

For a controllable amount, combine a 'clean' channel with a precision full-wave rectifier channel (standard op-amp plus diodes circuit). Use a pot to mix in as little or as much distortion as you like.

lineup 16th November 2012 03:05 PM

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Here is something what mean.

It is a small headphone amplifier
with IRF610 diff pair input
and a single end IRFP240 output fed from current source.
There are no bipolar doing any gain.

This harmonics spectra speak for itself.
You get the third harmonic along with the second.

DF96 16th November 2012 03:07 PM

Precision rectifier will give you even-order distortion only, dominated by 2nd.

jerluwoo 16th November 2012 04:02 PM

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Perhaps just a poorly designed jfet buffer will do.

wahab 16th November 2012 05:07 PM

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Use an input differential with a poor current source , typicaly a resistor
connected to a zener voltage reference.

triplej 16th November 2012 09:03 PM

Quote:

Originally Posted by wahab (Post 3244062)
Use an input differential with a poor current source , typicaly a resistor
connected to a zener voltage reference.

Very interesting. Will give that a go!

nigelwright7557 16th November 2012 09:21 PM

Quote:

Originally Posted by lineup (Post 3243866)
What can I technically do when designing an amplifier to make it add plenty of second harmonic?
Give from your experience and tell me.
Thank you.

Forget altering the amplifier and get hold of a soft limiter which will give a more rounded wave with plenty of even harmonics.


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