[sdiy] can I make this circuit change?

[db]

I tried 104 at 1k and 105 at 1k, and still not quite enough oomph to drive 
the LED on.

Maybe I *need* an op amp if I want to do this?


At 1/18/2009 01:07 PM, you wrote:
>You could try putting a 50k or 100k pot in there as a voltage devider,
>replacing R104 and R105 and tune it to work in a way that feels right,
>then measure what values to put in. Not exactly scientific, but it
>will give you values that "work."
>
>
>Mark
>
>
>
>On Jan 18, 2009, at 3:26 AM, db wrote:
>
>>
>>I know I should not let r104 get too low. What kind of range is ok
>>for r105?
>>
>>(There is no r106 here- it's just hard to read the scan)
>>
>>
>>
>>At 1/17/2009 08:03 PM, mark verbos wrote:
>>
>>>On Jan 17, 2009, at 10:35 PM, db wrote:
>>>
>>>>
>>>>
>>>>On the schematic here:
>>>>http://workingdistance.com/temp/mixer.jpg
>>>>
>>>>I lowered to r104 to 1k, and even then still not quite enough to
>>>>light the led on regular signal levels. :(
>>>
>>>You should be on the right track. Try making R106 bigger too.
>>
>>
>>dennis.barton:skylab2000[socal]
>>


dennis.barton:skylab2000[socal]