[sdiy] sync circuit woes

[Tom Bugs]

I don't think it has been directly stated that dan may also reduce the 
input resistor for the clean signal route if this is not sounding loud 
enough.
Of course, what others have said already has covered that, but it may 
not be obvious.. (who knows?!)

Eg input resistor 100k and feedback resistor 100k ==> gain of 1
half the input resistor to 47k while keeping the feedback still at 100k 
===> gain of 2
Of course, you'd keep the other input resistors the same (or increase 
their values if you're getting clipping)

Best,
Tom

Laurie Biddulph wrote:
> A summer not only adds (or sums) together the inputs but it also has 
> the function of multiplying or dividing the mixed signal depending 
> upon the feedback resistor. 100K in and 100K feedback is 1:1 so make 
> the 100K in the feedback adjustable so that you can trim for optimum 
> output level with all inputs maxed. Suggest the feedback be a small 
> resistor and trimmer so that you define the range of gain available.
>
> Best Regards
>
> (Mr) Laurie Biddulph
> Phone: +61 (0)2 4340 0938
> Mobile: 0400 257 645
>
> Elby Designs
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> ----- Original Message ----- From: "Dan Snazelle" 
> <subjectivity at hotmail.com>
> To: <music.maker at gte.net>; "sdiy" <synth-diy at dropmix.xs4all.nl>
> Sent: Friday, November 21, 2008 4:23 AM
> Subject: RE: [sdiy] sync circuit woes
>
>
>>
>>
>> Ok
>> I thought that in summer circuits, the feedback resistor HAD to be the
>> same value as the summing resistors! i thought that was what made
>> summers work properly. i feel very stupid right now.
>> Ok, so if i was using 100k, i can maybe try a 47k?
>> also...in my GUITAR PRE opamp, i am using a non inverting opamp with a
>> 10k to gnd resistor and a 100k feedback resistor for a gain of X10 but
>> it still isnt really loud enough compared to the other mixer inputs. SO
>> i was thinking of bringing it up higher BUT i dont want any distortion.
>> (there is already a dirty switch for that)
>> so what do you guys think i could get away with before distortion?
>> maybe 15x? i was thinking of putting in a 150k on the feedback
>> resistor.
>> thanks so much-diy
>>
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