The defenition of VGA?

[Thomas Juth]

Hi there!

I would be glad if someone could guide on this one=)

What is the true defenition of 'variable gain amplifiers'?

Is it equavilent to the 'gain reduction circuit' of compressors/limiters?

Can you call the heart of all 'gain reduction' topologies, a 'variable gain amplifier'...even if the topology applies 'variable resistance'?

Cheers!

/Thomas

 

[gyraf]

[quote author="Thomas Juth"]Can you call the heart of all 'gain reduction' topologies, a 'variable gain amplifier'...even if the topology applies 'variable resistance'?
[/quote]

Yes.

 

[Thomas Juth]

Thanks!

So does that mean that the 1176, for example, is built around a 'variable gain amplifier', which contains of a JFET circuit?

Does this stage also provide amplification, or just reduction?

And is 'gain reduction circuit' just another name for the same stage?

Cheers!

/Tom

 

[gyraf]

Why is this important?

Anyone familiar with audio circuits knows the FET- LDR- PWM- and VCA-based designs for electronically controlled signal level. There is hardly any confusion from how you name it, VGA or VCA - we all know what we're talking about..?

Jakob E.