I have build the loudspeaker jigg

[kees52]

I have build the loudspeaker jigg, so I can measure thiele small parameters, it consist of a class b amp and two opamps, this schematic is from someone here on diyaudio who I have made now a pcb for.

Now i can measure speakers with some more trustable outcomes.

 

[kees52]

Ohh old thread, but I have solder now the complete pcb, it have a 5 watts class B amp for better measurements.

regards

 

[kees52]

The stuf is ready, it works, better then use of the amp in the pc who is small, now I have all in one go to measure speakers.

 

[Mark Tillotson]

Care to describe a bit more about how you test? Is this just measuring complex impedance, or do you use it with a microphone too?

 

[kees52]

Care to describe a bit more about how you test? Is this just measuring complex impedance, or do you use it with a microphone too?

Maybe the schematic make some clear.

It is not for use with a mic, it measures with limp the impedance and resoance including the parameters, the amp in a pc is small, so a couple of watts outside is better.

Maybe I had better putting a pot into the amp input, or a limiter to prevent blow it if signal pc is to high, I can adjust feedback so it wil never happen, that makes no need for changing board.

Maybe the next time, using a amplifier ic.

regards'.

kees