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The capacitor blocks the 48V to your mic. The 48V via pin 3 is limited to a safe voltage by the resistor. Smaller values will make a 6dB/octave HP filter in the audio range. Mostly nor desired.

Dear All, My questions are, In the simpl48 circuit, what is the role of the capacitor? What happens if it is not used? What are the results at different values? Many thanks.

This method is valid for unbalanced loads, but not for all types of balanced loads.. This is true only if the outputs are non-floating, which is the case of the typical Schoeps arrangement, or

Try this method shown in a Jensen Tranformer app-note: https://www.jensen-transformers.com/wp-content/uploads/2014/08/as048.pdf That will work for an active output microphone if you measure the

"Earthworks Homepage's M23R Spec : OUTPUT IMPEDANCE ? ?65Ω balanced (between pins 2 & 3)" That means exactly what it states, that the output signal is taken between pins 2 and 3, and the impedance

Thanks Jerry, I thought it was 1K. I worked in Marketing for a decade... Medical Devices. And there was the FDA... ;-) Jules <jerryleemarcel@...> wrote:

In the absence of a comment saying different, impedances are measured at 1kHz. Some manufacturers indicate that impedance may vary over the audio range. Anything the mktg dept deems

Question for the group on this. What is the correct frequency to measure the output impedance? I am assuming referenced to 1Khz. Or should it be 20hz to 20Khz? What do manufacturers spec? I checked

I'm trying to get in touch with David Searle, aka Zephyr on MicBuilders. David, if you are still looking in occasionally, the email address I have for your no longer works. My old email address no

Dear Jerry, Thanks to your reply. Earthworks Homepage's M23R Spec : OUTPUT IMPEDANCE ? ?65Ω balanced (between pins 2 & 3) This is the specification provided on the website. What I mean here is

It seems correct, indicating a mic impedance of about 130 ohms.

Dear Jerry, I’m still getting similar results. R1 : 66 Ohm R2 : 65 Ohm Here’s my question: I’m using a single potentiometer to control both channels (R1 and R2), meaning adjusting it changes

Hello there, I was looking to buy some TSB/JLI-2590 Capsules but couldnt find any to ship here to germany with reasonable shipping costs. Micboosters charges 17 pounds for shipping and I paid over 30

Yes. >

Actually MR-PRO ->? potentiometer? ->? ?Mic? -> Preamp Pin 1? ? ? ?->? ? ? ? ? ?GND? ? ? ? ? ->? ?GND -> GND Pin 2? ? ? ?->? ? ? ? ? ? ?R1? ? ? ? ? ? -> Pin 3?

Actually, the wiring should be that: Make sure that nothing is connected to Pin1 of minirator.

Dear Jerry, Hello. In the meantime, my answer was late because I was preparing for the experimental environment. I made it with reference to the circuit diagram you gave me. I just changed the

Jack, practically ANY small signal 'LN' pnp will do. I have a liking for 'small' power stuff like Jerry & jp8 but the rest of your circuit must be super for this to have even 0.1dB effect on

And it also has the best Hfe matching, btw. I always pair the BCM53DS with a BCM56DS (NPN pair) to form a? CFP output for reduced THD and improved CMRR. Jan

BCM53DS seems particularly interesting, since it has a large geometry (related to the 1A max current). Quite often, these medium-power transistors have very low noise at currents of about 1-2 mA,