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MP573 Microphone preamplifier / Led pb and slight noise at high gain
« on: April 06, 2021, 02:11:43 PM »
Hi JP.
I'm sorry if my English is not good I will try to make myself understood as best I can.
I just finished my first Mp573, all tests are good except my LED.
Indeed, it is never green and as soon as I speak into the microphone, it turns red immediately whatever the gain.
can you help me to find the problem (error in the direction of the LED maybe)
I have a second problem. At very high gain, I have a buzz from the transformer (I Suppose) that goes round and round (like a melody). What can it come from ?
Thanks for your help.
Friendly
Chris
I'm sorry if my English is not good I will try to make myself understood as best I can.
I just finished my first Mp573, all tests are good except my LED.
Indeed, it is never green and as soon as I speak into the microphone, it turns red immediately whatever the gain.
can you help me to find the problem (error in the direction of the LED maybe)
I have a second problem. At very high gain, I have a buzz from the transformer (I Suppose) that goes round and round (like a melody). What can it come from ?
Thanks for your help.
Friendly
Chris