Guess input impedance SMSL 98E?

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rayma

rayma

Moderator
Joined 2011
cgallery said:
I haven't been able to find the input impedance of the SMSL 98E amplifiers.
Click to expand...

You can measure the input impedance by connecting a variable resistor in series with the input
(not as a volume control). Input a small AC voltage (perhaps 100mV) at 1kHz. Adjust the resistor
until the voltage output is half that with the resistor set to zero. This value of the resistor is
the input impedance.

Alternatively, a buffer circuit after the passive filter will eliminate the effect
of the input impedance loading on the filter.
 
Last edited:
C

cgallery

Member
Joined 2015
rayma said:
You can measure the input impedance by connecting a variable resistor in series with the input
(not as a volume control). Input a small AC voltage (perhaps 100mV) at 1kHz. Adjust the resistor
until the voltage output is half that with the resistor set to zero. This value of the resistor is
the input impedance.
Click to expand...


Yeah I found instructions but I don't have the gear.
 
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