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Mic amplifier noise

I build a mic amplifier for a standard hands free (Apple 4-pole jack). However, even without anything plugged into the jack there's audible noise at the output (MIC_IN in diagram)....

Electrical Engineering Asked by roc1 on 2 years ago

How BLE central determine the connection interval

After connection established between central and peripheral, they start communicate at specified intervals called connection interval. As far as i know, the interval determined by central not peripheral. But the...

Electrical Engineering Asked on 2 years ago

Can you trash fortress indefinitely with donate?

So the two cards* in question here are Fortress, which reads:+1 Card +1 ActionWhen you trash this put it into your handand Donate which reads:After this turn, put all...

Board & Card Games Asked on 2 years ago

Lorentz surfaces, conformal metrics and eigenvalues

From what I understand of Lorentz surfaces (spacetimes of dimension 2), it seems that, according to Kulkarni's theorem, two reasonable enough Lorentz surfaces (I am only interested in...

Physics Asked on 2 years ago

Does the wavelength of an individual quantum particle affect its chances of quantum tunneling through a barrier?

I've read elsewhere about the energy of a wave or wave packet, and the amplitude of its probability amplitude, affecting its odds of quantum tunneling... But what about the wavelength...

Physics Asked on 2 years ago

Time independence of light in optical fibers

The propagation of light in optical fibers is governed by the equation $ifrac{partial A}{partial z} = frac{beta_2}{2}frac{partial^2A}{partial T^2} - gamma|A|^2A$ where $A(z,T)$ represents the amplitude of the field...

Physics Asked on 2 years ago

Is the $S$-matrix a scalar operator?

The scattering $S$ operator which is defined to be the operator corresponding to $S$ matrix should be rotational invariance, does this imply $S$ operator is a scalar...

Physics Asked on 2 years ago

Does the elasticity of a collision depend on the object's mass?

This refers to my other question Why is the ideal gas law only valid for hydrogen?. In the update, my teacher said that hydrogen is closer to an ideal...

Physics Asked on 2 years ago

Closed curve through an event in spacetime

I'm studying the book Techniques of Differential Topology in Relativity by Roger Penrose and I'm stuck in an exercise he left to the reader. We say that the spacetime ...

Physics Asked on 2 years ago

Rigid body motion decomposition

A rigid body motion can be decomposed into translation and rotation. My question is, given a rigid body motion velocities of all points in the body, how to decompose this...

Physics Asked on 2 years ago

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