Contents
How does an electret Mic Work on a breadboard?
Electret microphones normally include an amplifying transistor that needs a supply voltage which I don’t see anywhere. It’s done just by connecting a pull-up resistor of several kOhm to the signal line (“MIC”). 4 Op-Amps are not helping, you are multiplying any available noise as much as the signal. esp on breadboard with no decoupling
Is there a bias supply for a mic?
There is no bias supply for the microphone. You said this was a electret, so there should be a pullup to 5 V. Usually these should be a few kΩ. Check the datasheet of your mic. You should also filter the pullup voltage to keep power supply noise from being fed directly into the mic.
What should the gain of a microphone be?
A microphone amp usually needs a gain of around 1000 at full volume to get to line level signals. Two gain stages at front with a gain of 30 each is usually about right, with a volume control between the two of them. After the signal has been amplified, any noise added is a much lower fraction of the whole.
What should the pullup voltage be on a mic?
Check the datasheet of your mic. You should also filter the pullup voltage to keep power supply noise from being fed directly into the mic. Perhaps 1 kΩ from 5 V followed by 20 µF to ground, then 2 kΩ to the mic. Again, see the mic datasheet.
What kind of circuit does a condenser mic have?
Ribbon The condenser microphone generally has an embedded electronic circuit. This circuit can contain a tube or valve, like in guitar amps, for example (picture 1); transistors (being a solid-state mic); or even be an electret microphone. By design, condenser microphones have high transient response and a excellent response to high frequencies.
Is the condenser microphone a good or bad microphone?
Rich in high and ultra high frequencies: On a good day we can say those microphones are “beautiful for detail”, on a bad day we call them “a little too bright”. But one thing is certain: condenser microphones are very accurate in capturing richness of detail in high end and nuances.