Hi...
"The preamplifier of the stomp box adapter [has] an AC gain of 20",
and
in order to have a gain of 10, I was thinking about a swtich to
change the two resistors.
(The AC gain can be reduced if need by by increasing the value of the
470R resistor. For example, a 1k resistor in this position would give
a gain of 10. The 1k resistor of the input divider would need to be
increased to 2k2 to keep the drop and gain amtched.)
Then I wondered : why do not swap the switch and resistors by to
potentiometers, one for amplifying, the other (passive circuit)to
lower gain...?
AMP : 470 for x20, 1k for x10 and 2k2 for x5, 4k7 for x2.5...?
ATT : 1k for x20, 2k2 for x10 and 4k7 for x5, 10k for x2.5...?
So 4K7 and 10K linear pots would be okay for a x2.5/x20 gain
excursion ?
(Linear ? even with audio signals processed ?)
I guess the 470R resistor should be keep in place (maximum gain value
x20) as the 1K attenuating resistor, to keep a certain gain-
relationship between the two potentiometers at position 0...
Regards,
Emmanuel
"The preamplifier of the stomp box adapter [has] an AC gain of 20",
and
in order to have a gain of 10, I was thinking about a swtich to
change the two resistors.
(The AC gain can be reduced if need by by increasing the value of the
470R resistor. For example, a 1k resistor in this position would give
a gain of 10. The 1k resistor of the input divider would need to be
increased to 2k2 to keep the drop and gain amtched.)
Then I wondered : why do not swap the switch and resistors by to
potentiometers, one for amplifying, the other (passive circuit)to
lower gain...?
AMP : 470 for x20, 1k for x10 and 2k2 for x5, 4k7 for x2.5...?
ATT : 1k for x20, 2k2 for x10 and 4k7 for x5, 10k for x2.5...?
So 4K7 and 10K linear pots would be okay for a x2.5/x20 gain
excursion ?
(Linear ? even with audio signals processed ?)
I guess the 470R resistor should be keep in place (maximum gain value
x20) as the 1K attenuating resistor, to keep a certain gain-
relationship between the two potentiometers at position 0...
Regards,
Emmanuel