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Thanks for the advice and sorry for not being clear about what I want to do — I was hoping to increase the max SPL that I can capture without overloading the mic, to make a quite sensitive mic more

Why do you need to reduce the sensitivity?? You only need to do this if the mike itself is overloading.? Otherwise just turn the preamp gain down.

Zander, can you tell us what circuit will use with the EM258?? What recorder?? What recording situation etc? The 'best' solution to your problem depend on these. IMHO, the options are * convert

As per James, I'm wondering about this too - whether the ones posing the question are trying to raise the max possible sound pressure level they can accommodate (ie their mic is being overloaded by

Is "recreasing" the opposite of "inducing"?? :) -Scott -- ---- Scott Helmke ---- scott@... ---- (734) 604-9340 ---- "I have ceased distinguishing between the religious and the

is there another way to reduce the sensitivity, ...? _______________________________________ While I believe this was mentioned previously, ... I generally use an L or T attenuation pad made from

That would matter if the voltage source was a stiff one, but in most cases it has some resistance, which tends to average teh bias point. It is always possible, when teh optimal combination of

Jerry Lee Marcel: The drain resistor also sets the dc operating point of the inbuilt JFET transistor. There is only one optimum value of that resistor that nets you reasonably symmetrical clipping at

You can reduce gain of the internal jfet to unity if you disconnect capsule gnd from ground and instead connect it directly to capsule drain. That way you make it a charge amp just like the km84, just

"decreasing", not recreasing.

Have you tried recreasing the resistor ? 1kohm should reduce level by 6dB, 620 ohms by 10dB, and so on.

I've got this problem also, but with a two-wire Primo em258 capsule — since I believe drain and ground are already connected inside the capsule, is there another way to reduce the sensitivity, or is

You can reduce gain of the internal jfet to unity if you disconnect capsule gnd from ground and instead connect it directly to capsule drain. That way you make it a charge amp just like the km84, just

Hi Milan, you may try the suggested schematic in the datasheet, something like this. The EM200 is capable to manage SPLs up to 136 dB, maybe a good windscreen is enough in most cases. At first glance

That's right, you don't need to do the mod. Just remove the 22uF capacitor across the 5k6 resistor.

Increasing this resistor would not change the sensitivity if the capacitor is still there. It would just decrease headroom.

Just disconnect the 22uF capacitor across the 5k6 resistor.

One of the challenges here is that this methodology lowers the voltage out of the FET it may reduce output but not headroom/maxSPL Ideally we want to lower the signal going into the Fet. It’s

Here is my actual schematic: /g/MicBuilders/message/32232

Do you have a resistor between drain and source? Primo recommend 5.6KOhm but you can adjust that value to change the sensitivity. Cheers Jack