[sdiy] Dumb mixer circuit question

[harry bissell]

Of course there is another way...

Tie the input signal to the top of the pot. Ground the other end...and 
run the
wiper to the input of the inverting opamp. If you keep the pot impedance 
fairly
high and the wiper resistance even higher... the loading on the input 
changes very
little. The impedance to the opamp changes but who cares...

This can save opamps... the linearity of the attenuation is not perfect, 
of course

H^) harry

Tom Arnold wrote:
> On Thu, Oct 05, 2006 at 02:27:13PM -0700, Harry Bissell Jr wrote:
>   
>> So whats the question ???
>>
>> (yes you can do that no problem, its a good approach)
>>     
>
> Yeah. I guess I kinda missed the question part.  I guess the question is
> putting the pot between the mixer stages and thus increasing the complexity,
> worth the increase in complexity?  I suppose my answer is "yes" since I've
> proven on he bench that I've got stuff that doesnt otherwise like being tied
> to ground across the 10k pot.
>
>