Measuring input impedance of line-in stage.

Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

I bought myself a Toshiba 3950, and want to do the Swenson mods to it. I need to measure the input impedance of the line in stage so I can correctly size the caps for the project.
I was thinking of using a series resistor and an ac millivoltmeter, in conjunction with a signal generator. Generate 1KHz, feed it into the resistor. Measure the voltage across the resistor, then compute the current through the resistor. Next, measure the voltage across the line-in port. We have the current from the previous step, so we should be able to compute the impedance.

Is this the way to do it, or am I totally out to lunch?
Thanks,
pixpop

This post is made possible by the generous support of people like you and our sponsors:

Schiit Audio

Topic - Measuring input impedance of line-in stage. - pixpop 00:21:53 01/02/05 (7)

Re: Measuring input impedance of line-in stage. - djk 16:53:57 01/02/05 (2)

Re: Measuring input impedance of line-in stage. - SysInfo 17:00:46 01/04/05 (1)

Re: Measuring input impedance of line-in stage. - djk 19:53:06 01/08/05 (0)

That will do it .... - clifff 01:53:05 01/02/05 (3)

Re: That will do it .... - pixpop 19:42:54 01/02/05 (2)

Was it Stan Freiberg who said .......... - clifff 07:46:15 01/03/05 (1)

Re: Was it Stan Freiberg who said .......... - Sisty Ugler 13:34:52 02/03/05 (0)

You can not post to an archived thread.