Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [mixer]

A mixer or frequency mixer is a nonlinear electrical circuit that creates new frequencies from two signals applied to it.

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Accidentally downmixed stereo to mono, why does this work?

I have a cheap Chinese Bluetooth audio amplifier like this: It has four screw terminals for the speaker connections, namely L+, L-, R+ and R-. I accidentally connected a single speaker to L+ and R-, and was surprised to find that I could hear both…
Bas
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How do those 3.5mm stereo to mono adapters work?

I have one of those 3.5mm Female Mini-phone mono to Mini-phone stereo which I was hoping to use for connecting the output of an MP3 player (stereo) to a pillow speaker (mono). But then it occurred to me that I may be causing damage to the output…
WinWin
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Algorithm for mixing 2 axis analog input to control a differential motor drive

I am looking for information about how to implement proper mixing of 2 analog joystick signals (X an Y axis) to control a dual differential motor drive ("tank like" drive) using a uC (ATMega328p in my case, but same should apply to any uC with ADC…
Kamil Zadora
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Using diodes to mix 2 audio signals into one set of speakers

I have the audio output of 2 computers connected to only one set of speakers. Each computer uses one of these external USB sound cards: And I use this splitter cable to wire the signals together: The whole thing works, but with some minor…
GetFree
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What's the purpose of the band-pass filter in an RF transmitter?

What is the purpose of the marked band-pass filter?
LucasSokol
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Can I input a square wave LO into a mixer?

I would like to downconvert a signal at 169.55MHz (10khz bandwidth) into an IF of 20.4MHz. For that purpose, I need a local oscillator of 149.15MHz or 189.95MHz. But... of course, I cannot find a crystal at these frequencies (at least I think I…
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Radar received RF signal phase-shifted by 90 to obtain I/Q signals

I am trying to get idea how marine radar works before start any repairing process. And this part confused me, most articles that i saw explain that in mixing stage we obtain I/Q signals using LO signal and as well LO shifted by 90 degree, but…
Tremax
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Discrete component FM radio receiver circuit - explanation needed

I have built an FM radio receiver from a kit. I'm very happy with the results! It is the Sinclair Micro FM. My goal is to learn about discrete electronics (NO IC's.) The radio works great, but I am having trouble understanding the very first…
dhrovner
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HDMI Mixer/Blender/Superimposer-Chip (2 to 1) wanted

Is there a chip on the market which can overlay one HDMI-input over another ? Chip should have 2 * HDMI -IN and 1 * HDMI-OUT HDMI-IN-1 connected with Sat-receiver or other TV-Source HDMI-IN-2 connected with Android-Box or Network Player The Menues…
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Audio summing mixer- inverting or non inverting output?

All the audio mixer circuit examples I see online are based off of the summing amplifier: This is an inverting op amp configuration so the output is inverted. I built a similar circuit and I couldn't tell that the output signal was inverted by…
donut
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24GHz Radar : IF amplification and strange mixer output

I am currently working on a project where I have to study a microwave Doppler Radar. Here are some details so that you can better understand it : a local oscillator (LO) at 24GHz is linked to an emitter antenna. A moving target reflects back the…
C_Computing
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Adding Two Balun Transformers to SA612 Mixer Has No Effect on LO Suppression

I'm experimenting with a SE612 mixer to learn the basis of RF. I read that the mixer can either be single-ended or balanced, and a double-balanced mixer has the best performance in terms of LO-RF isolation, as both LO and RF are suppressed at the…
比尔盖子
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Multiple Options for Passive Audio Mixer

I have two mono audio inputs that I need to passively combine into a single output. Both inputs have built-in volume controls so I don't need any volume control in the mixer. I've been looking at ways to do this, and have seen a couple common…
Jordan
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Difference between Inphase/Quadrature (I/Q) Mixer and I/Q Demodulator

I wanted to know the primary difference between an Inphase/Quadrature (I/Q) Demodulator and an I/Q Mixer. My requirements are as follows: My input signal is a 500 Mhz bandwidth signal centred around 4.25 Ghz. I need to obtain the I and Q components…
gururaj
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How do receivers know what to output to radio speaker or TV screen?

I understand that receivers are often used with mixers which take the sum and difference of two signals to make an output signal. How does a radio signal of say 102.5 MHz know to tell the speakers to output a person singing, a guitar with…
Josh
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