wm-61 measuring mic

[454Casull]

Originally posted by nukaidee
uh. whats a coupling cap? i never understood what they were used for.

Couples (connects) AC to block DC. Input caps tend to be coupling caps.

http://en.wikipedia.org/wiki/Capacitive_coupling

Originally posted by ashok
Well, one could always connect a wm-61 to a 9V supply with a 10 K resistor and see what the voltage is between ground and the mic/resistor junction. Then use an electrolytic cap and align it with the polarity that is indicated.
If the junction is less than 4.5 volts then cap plus goes to the opamp input and vice versa.

I'll let you know when my electrolytic fries.

Anyway, Linkwitz has a polarized cap as an input from the WM-61a.

[nukaidee]

well I hope you guys enjoy photos as much as I do. my stereo pair is done. I only could match them by resistance. Then I did the linkwitz mod on them. the tubing is brass, mogami mini starquad cable, and gold neutrik ends. clear and black heatshrink all over, stuff with cotton.

Sorry about the quality, taken with my phone. Spent about 4 hours making these

[nukaidee]

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[nukaidee]

oh btw. I love your comments. thanks!