Marik
Pro Microphone Design
Swapmaster,
>Got a good connection now and it is about 5 db down from the stock mic and I am very happy with it. I don't have a mic preamp yet so I removed the preamp from the mic and made a steel adapter to mount an RCA jack in the bottom of the Behringer. I feed it into a modified Radioshack SPL meter which has a reasonably clean and very flat preamp then from the line out of the meter to the laptop.>
Good! I am glad it works for you. I am little bit puzzled, though. The modified WM61 should have same output as stock connected WM60. I think you have 5db drop because you don't use a preamp in the mic, which should give gain around this figure.
<Marik, how will the preamp in my mic with the transformer compare to the newer ones without the transformer? And can it be modded to the same characteristics you are getting with yours?>
Although I never heard the transformer coupled one, I wouldn't trust cheap Chinese trannies. Since there are much less traces on the board, I think it would be much easier to make a new PCB.
<Did some searching around on Digikey last night.. there are a few Linear low noise regulators that would be interesting to try, (only 20uV of noise!) and in smal SMT packages as well.. but only no good values fixed, have to use a variable.
And 10v isn't that rare of a value as I thought, for the more everyday 78Lxx series of TO-92 parts..>
Jon, on the second thought, I am not sure how much reduction of noise you will get using regulator, but I am sure then you can use smaller value of filtering capacitor. I tried to use caps here up to 6800uf and did not get any further improvement.
>Got a good connection now and it is about 5 db down from the stock mic and I am very happy with it. I don't have a mic preamp yet so I removed the preamp from the mic and made a steel adapter to mount an RCA jack in the bottom of the Behringer. I feed it into a modified Radioshack SPL meter which has a reasonably clean and very flat preamp then from the line out of the meter to the laptop.>
Good! I am glad it works for you. I am little bit puzzled, though. The modified WM61 should have same output as stock connected WM60. I think you have 5db drop because you don't use a preamp in the mic, which should give gain around this figure.
<Marik, how will the preamp in my mic with the transformer compare to the newer ones without the transformer? And can it be modded to the same characteristics you are getting with yours?>
Although I never heard the transformer coupled one, I wouldn't trust cheap Chinese trannies. Since there are much less traces on the board, I think it would be much easier to make a new PCB.
<Did some searching around on Digikey last night.. there are a few Linear low noise regulators that would be interesting to try, (only 20uV of noise!) and in smal SMT packages as well.. but only no good values fixed, have to use a variable.
And 10v isn't that rare of a value as I thought, for the more everyday 78Lxx series of TO-92 parts..>
Jon, on the second thought, I am not sure how much reduction of noise you will get using regulator, but I am sure then you can use smaller value of filtering capacitor. I tried to use caps here up to 6800uf and did not get any further improvement.