[synthiaks]

This is probably a stupid question but I'm asking it anyway.

I have a BFE Kompressor that say in the calibration notes that output Impedance of the signal generator used should be 10ohms or less.  Most of the generators i have come across have 50 or 600Ohm s output Impedance. Is this because i only have and have seen the cheap ones or How does this 10Ohm come about?

S

[JohnRoberts]

10 ohms  is not typical for professional signal generators. Good ones are switchable between 50 ohm or 600 ohm.

Use 50 ohms

Maybe get a different compressor.

JR

[synthiaks]

Thank's John!

Ok, I will use the 50ohm on My generator.

Do you have any idea where the 10ohm comes from? The BFE/Filtek company did a lot of German Broadcast equipment and their Specifications are quite detailed. No low quality equipment.

S

[Dualflip]

You can add a buffer to your signal generator with a good opamp like the LM4562 and a 10 ohm resistor output, the distortion and noise should be negligible

[gyraf]

If really needed, and if you have plenty signal level in your generator, you can always lower signal source impedance by passively attenuating - e.g. 40 Ohms in series, then 10 Ohms to ground - will give you a ca. 10 Ohms source at 1/5 the original level.

But as mentioned above, you may not need it..

/Jakob E.

[JohnRoberts]

Any decent quality audio amplifier that can drive loudspeakers will have an output impedance in the mOhm range.

As Gyraf suggested a simple resistive pad can also drop the source impedance to 10 ohms.

It might be interesting to see of you measure any difference between 10 ohm and 50 ohm.

JR

[synthiaks]

Thank's for all the help!

I tested it roughly with the 50ohm generator. When i have time i might get back and do a test with the resistors

S

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