[sdiy] can I make this circuit change?

db dbarton at pacbell.net
Sun Jan 18 10:32:01 CET 2009



What if I used an op amp after r104 to amplify signal to the base of q101.
Is that what I really need to do?

Would I need anything other than an opamp added to my existing circuit?




>>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. :(
>>I normally keep input gain (VR101) all the way down.
>>I don't really understand how in this circuit the gain knob affects the 
>>led - it looks to me like the signal to the led circuit would be the same 
>>regardless of gain setting.
>>What am I missing?
>>Anything else I can try in this circuit to get some more ooomph to the leds?
>>I have 16 channels to do so I'm hoping for simple..
>>  >I have a mixer with an input led for *overload*.
>>  >I was going to add LEDs for showing signal is present in the input, 
>> but seems easier if I just make this led signal regular input instead of 
>> overload.
>>
>>dennis.barton:skylab2000[socal]
>>
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dennis.barton:skylab2000[socal]






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