Electrical Engineering

Questions tagged [mixer]

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

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Power amplifier for sound mixer that has connection like a car amplifier speaker wire but not have power coming from battery,remote,ground?

We want to use a sound mixer at our new church meeting place. It turns out that the wiring connecting the speakers (thoses on the ceiling) uses a different wiring. We noticed we kind would have to use ...
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74 views

I'd like it if my circuit was checked

LED strip runs on 0.5-2A. LED Strip needs 5v, has one pin for that, one for red, one for green, and one for blue. I will be using a total of 4.8 volts. Using ohms law, with the minimum current as the ...
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31 views

MOS working point in a differential analog mixer

let's consider this simple configuration of a balanced differential mixer (analog multiplier): I have understood that the local oscillator is generally a high signal, while the radio-frequency signal ...
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3answers
69 views

In Amplitude Modulation transmission, why do we need to mix (multiply) rather than just add the carrier and base-band?

Why is it necessary to mix the carrier with the message signal to create the sum and difference of the frequencies when you can just add both signal? Not only is it much easier to achieve but it would ...
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25 views

Use several mono balanced output as input for stereo headphone amplifier sharing one line

I have an audio interface with 8 inputs and 10 outputs. I want to connect 5 microphones and assign a headphone to each one with the output, having the voice of that particular mic coming through the ...
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4answers
63 views

Clarifications about up and down converting mixers

Let's look at this definition of mixers (reference): A real mixer cannot be driven by arbitrary inputs. Instead one port, the "LO" port, is driven by a Local Oscillator with a fixed amplitude ...
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78 views

Why does a Double-Balanced Mixer Reject the LO?

Look at the image of the so-called Double-Balanced Mixer (this is the active version). I understand why there is no leakage of the RF frequency in the output (because the LO square wave by which the ...
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5answers
86 views

Why is Frequency Conversion Additive in Acoustics Beating, but Multiplicative in Heterodyning?

In radio electronics, one of the first concept to learn is frequency conversion by using a mixer. And it's strongly emphasized that the mixer is a multiplier, not an adder used in audio circuitry. The ...
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74 views

Voltage across tape recorders

Here there's a question that I'd like to double check with you lot. According to an article on impedance, the voltage across each of the tape recorders in the image is divided by two. Is that so? ...
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3answers
227 views

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 ...
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1answer
41 views

SA636 Local Oscillator — Which Pin?

This is about a very specific RF system on a chip -- NXP's SA636, "Low voltage, high-performance mixer FM/IF system...". Datasheet is here: https://www.nxp.com/docs/en/data-sheet/SA636.pdf. The ...
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23 views

Microphone mixer Transformer input high voltage

I have a Yamaha MG82CX anaalogue microphone mixer. The external power supply is just a transformer that gives 2 x 18.5v ac at 0.62A with 230v input. It burnt out when the output was short circuited so ...
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1answer
67 views

Active Mixer RF Input Power and Input IP3i, P1dB Question

I am new and learning in this field. The received signal is first amplified with SKY65404 LNA and secondly with HMC313 Amplifier. Lastly it is connected to Active Mixer ADL5801's RFIN pins. In ...
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42 views

Do I need a headphones amp for this?

I have a digital piano with a headphones jack built-in. It's a Kawai CN27 if it matters. When I play the piano with headphones on I would like to mix in the audio signal from my phone's headphones ...
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1answer
109 views

Does a Center-Tapped RF Balun Perform Better than Untapped Baluns?

To my knowledge, a conventional transformer is a balun - you simply connect a single-ended signal at the primary side, you get the balanced signal at the secondary side - magnetic coupling doesn't ...
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1answer
56 views

High - Frequency Carrier Necessity

let's consider a basic scheme of a receiver. Now I have two questions: I was told that the presence of the mixer is important since it is useful to delete the carrier frequency of the received ...
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1answer
50 views

RF External matching network - mixer IC

I have question about mixer IC (Max2335), datasheet: https://datasheets.maximintegrated.com/en/ds/MAX2335.pdf LNAOUT and MIXIN in pin description (p. 5) have notice: "Requires an external matching ...
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2answers
90 views

How to calculate “effective source impedance” in this audio mixing circuit?

I am new to electronics and have recently been trying to get my head around audio mixing. I stumbled across a helpful introduction by Rod Elliot on passive and active mixers, but I am stuck on a small ...
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1answer
310 views

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 ...
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1answer
75 views

Gain of a Dual Gate MOSFET

simulate this circuit – Schematic created using CircuitLab This is the schematic of the circuit but tried to find the gain of this circuit, assuming 50 % of the Duty Cycle for the LO, and M2 ...
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2answers
221 views

Double Balanced Mixer

Consider this double balanced mixer: Its output contains only the frequencies generated by the product of those of LO and RF signals, where LO is supposed to be a large signal (which switches ON and ...
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3answers
171 views

BJT Amplifier vs Manufactured RF Mixers

900Mhz Operation This is a BJT mixer design I found on google From my understanding in order to use a BJT amplifier as a mixer you have to be in the 1dB compression point. Question: Am I wrong ? ...
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1answer
107 views

Volume Control for Mixer Circuit using DAC Refence

I am mixing two stereo audio signals together and would like to control the output volume using the (0-3.3v) DAC on my microcontroller. I'm wondering if there is a simple modification I can do to this ...
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2answers
491 views

Device to loopback mic to headphones

I have an issue with my headset. I can’t stand not being able to hear myself speak. I’d like to build a passive device to loopback the mic to the headphones that would be plugged in-line between the ...
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1answer
119 views

gilbert cell mixer implementation and balun

1) How do I interface LC balun with mixer using differential current RF+ and RF- input signals ? 2) How should I deal with the load impedance (RL) for LO+ and LO- which is almost infinite because it ...
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129 views

Schematic diagram of a double-balanced Gilbert cell mixer

For the following gilbert cell circuit, I have few questions. I understand that R1 to R4 as well as M1 to M6 are parts of the double-balanced differential topology which helps to eliminate the DC ...
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1answer
156 views

Does a low-pass filter average the higher-order frequencies into a “DC offset”?

In a Pound-Drever-Hall lock, an electronic signal is produced of the form: We are interested in electronically isolating the term: My question is: how can we filter to get exactly this term (listed ...
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21 views

Conversion Gain Definition for DSB-SC Upconversion

If I multiply a baseband signal \$A cos(C\omega t)\$ and a carrier signal \$B cos(D\omega t)\$, the result is \$\frac{AB}{2} [cos(C-D)\omega t+cos(C+D)\omega t]\$, which is a double sideband, ...
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1k views

Converting a headphone output to line level

I have a guitar amp that has a headphone output. I would like to convert this signal to line level so I can use it in a small mixer along with other line level signals to be heard in "in ear" style ...
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29 views

ADS harmonic balance discrepancies with sawtooth waveform

I am using ADS for a simulation where I am biasing a diode with a sawtooth waveform. The sawtooth source provided by ADS, and 3 harmonics are specified There are different phase delays across the ...
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1answer
58 views

Can you make an electric gamma ray emmiter by adding up frequencies with freq. mixers up until you reach gamma ray herz quantities?

I just thought this up. Theoretically if you can add freq numbers you can get to large quantities like in a calculator, only this time mixing electric frequencies using amounts of circuitry right? Is ...
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57 views

Appropriate driver amplifier to amplify an FPGA pin voltage for RF applications

I'm trying to built a nanoseconds RF transmitter using an FPGA and an up-converter. However I don't know the correct configuration (I prefer a single IC) in order to drive a nanosecond pulse (pulse ...
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2answers
121 views

I need to keep one of my input signal of my mixer intact

I'm currently working on an audio circuit. I'm using a simple mixer to mix two audio signals together. It works well enough for now. Here is the circuit : simulate this circuit – Schematic ...
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2answers
300 views

Mixing analog audio signals with resistors

I am creating a type of mixer for 2 audio inputs into 1 output so i can use 1 pair of headphones with 2 computers without buying an expensive mixer with a amp Currently i have 1k 1/2W metal resistors ...
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138 views

Hardware audio mixing [closed]

I'm having a hard time trying to understand some basic sound engineering concepts. From https://en.wikipedia.org/wiki/Original_Chip_Set#Paula: Paula has four DMA-driven 8-bit PCM sample sound ...
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1answer
651 views

Gilbert cell. Understanding the basic

I am trying to understand a concept of Gilbert cell. I have the next figure. Quastion1: If +1V is set up in (3), then in (4) is admitted -1V, and for (5) is -1V, (5) +1V. The current source is sume ...
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1answer
743 views

Explanation of 3 Tone Control Circuit

I'm building an analog drum machine and want to have a 3 tone control circuit to individually adjust the bass, midtones, and treble frequencies on each of my instrument channels. I thought it would ...
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42 views

2 tone test with RF mixer

I am designing a system that uses RF to probe the nonlinearity of a target. It works as follows. Transmitter sends out 2 RF frequencies, such as 900 and 910MHz. The target/reflector has a ...
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3answers
95 views

How can guitar pickups hot leads be wired in parallel without causing current problems?

I am looking up wiring diagrams for electric guitar pickups and noticing that the common method for combining two pickup signals is just to have a switch that can optionally have both the hot leads ...
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4answers
264 views

How to amplify RF signal to high enough level for a CMOS downconverting mixer?

I've been reading original academic papers on mixers and now a RF textbook and I have been unable to understand a very basic thing, which is how do I get a RF signal, say -65 dBm, at a high enough ...
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595 views

Gilbert cell biasing

I'm new here so I'm going to make is as simple as it can get.. How can I bias a Gilbert cell with bjt transistors like this one: What methods can I use to bias the transistors? Is there any example ...
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1answer
78 views

Harmonic mixing in spectrum analyzers

I'm having a pretty difficult time understanding how tuning works when using harmonics in spectrum analyzers. I'm reading about the topic from Keysight's AN 150. Question 1 The following plot is ...
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2answers
105 views

How do multiple mixing stages work in a spectrum analyzer?

I'm reading about spectrum analyzers from Keysight's AN 150. On page 12 they explain how multiple mixing stages are used to obtain narrower IF filters. The block diagram offered is the following one: ...
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2answers
1k views

How does tuning in a spectrum analyzer actually work?

I have a pretty basic doubt about how tuning works in spectrum analyzers. I'm reading about the topic from Keysight's AN 150. The problem arises in this paragraph in page 11: We need to pick an ...
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106 views

How do I create a subtractive or dffferential two channel audio mixer?

I have a desktop mixer made by Behringer (Xenyx X2222USB although I am not using its USB capabilities) which has a line level output that feeds 2 channels of a Behringer USB audio interface (U-Phoria ...
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3answers
295 views

Are there any drawbacks to this oscillator frequency multiplier circuit?

I'm trying to make an upconverter from 65 MHz to UHF band using a mixer; I therefore need an oscillator frequency around 375 MHz to mix with the 65 MHz base signal. I'm also trying to vary the ...
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1answer
36 views

Mixer datasheet plots

I am trying to read datasheets of mixers... For the plots in datasheets, for example Conversion Loss/Gain vs frequency, is that frequency RF or LO? Analog Devices labels the x-axis as RF frequency ...
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194 views

When to bias diodes in double balanced ring mixer?

Do I need to bias up the didoes in a double balanced ring mixer? Some diodes have turn on voltage at 0.3V, and some turn on at 1.2V. If LO power is about 5dBm (~0.6V peak voltage), I would need extra ...
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257 views

What is LO rejection in a mixer?

Could anyone please tell me how LO rejection is defined in a mixer? I've heard Image Rejection but not LO rejection. Please help! Thanks.
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67 views

Diodes for mixer design

For a diode ring mixer, how should I choose the types of diodes? I've seen Schottky diodes as the primary choice. but why not PIN diodes? What diode aspects should I consider when designing a mixer? ...

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