Hi all,
I've been looking at some of the commercial kits available to try and get a handle on typical resistor values for gainclones. The one that seems to vary the most is the input resistor which varies from 220R to 1k, while the feedback resistors are universally 22k and 680R.
I am interested to know the relative merits (if any) of these different values for the input resistor.
Additionally, some place the 22k resistor from the input to ground before the input resistor and some place it after the input resistor. Is there any advantage to either method?
Your advice is appreciated.
Greg.
I've been looking at some of the commercial kits available to try and get a handle on typical resistor values for gainclones. The one that seems to vary the most is the input resistor which varies from 220R to 1k, while the feedback resistors are universally 22k and 680R.
I am interested to know the relative merits (if any) of these different values for the input resistor.
Additionally, some place the 22k resistor from the input to ground before the input resistor and some place it after the input resistor. Is there any advantage to either method?
Your advice is appreciated.
Greg.
Judging from the values you are refering to the blocking resistor. The datasheet describes its function like this.
The bigger the resistor, the better the protection and the bigger its potential bad influence on the sound.
If the blocking resistor (1k) is placed before the input resistor (22k to ground) they form an attenuator. That reduces the input voltage by 1/23. If the blocking resistor's value was higher, you could use that as a limiter with powerful sources. With the blocking resistor after the input resistor you don't loose any input voltage, which may be an advantage with weak sources. No big difference either way.
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