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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Transient DC current on mixer output

I have an audio mixer with the following circuit (I omitted the input stage): I removed the mono instrument output and used the jack connector as an alternative line-output. However, while doing so, ...
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38 views

What are the capacitors between the IN and OUT pins of a TDA7318 mixer chip for?

Fiddling around with my TDA7318 mixer chip, I've found a strange contradiction between the suggested "test circuit" cited in the manufacturer's datasheet, and the schematic published by ...
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What does resistor value change in a passive audio sum circuit?

I'm looking to build a passive audio sum box to connect two mixer headphone outputs (with output impedances of 10 Ω and unknown) to a single pair of headphones for music performance. I plan to use my ...
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75 views

Difference between a frequency synthesizer and a frequency mixer

I have tried looking a couple different places but cannot find a concise explanation on the difference between a frequency synthesizer and a frequency mixer. My goal is to take a signal at 915 MHz and ...
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33 views

Single balanced mixer, multi-tone analysis

I realized the circuit shown below on ADS. Schematic of the mixer can be shown below. As can be clearly seen from the figure below, to perform a multi-tone analysis RF signal is feeded with two ...
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1answer
68 views

Significance of the center-tapped transformers in mixer circuits

How does center-tapped transformer work on the circuit given below? In analog rectifier circuits, one of ports of the center-tapped transformer is connected to a sinusoidal source while others are ...
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26 views

Why is the signal at X getting distorted at the input of the mixer (node “X” as shown in figure)

If the signal at X is different from the signal at Y or the pure sine (transient difference) at Y gets distorted at the X, then the sample and hold operation of the input sine wave is not happening ...
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2answers
69 views

555 timer Theremin - capacitor choice, and question about mixing signals

I'm trying to create 555-timer based Theremin, but I have a few questions that I don't quite understand. For now, I'm building it on a breadboard (yes, I know it's not the best option), but I don't ...
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1answer
52 views

Switched capacitor sample and hold circuit as as mixer

I am trying to find out how important the "hold " level in a sample and hold down-conversion mixer is. If the level is decreased, will it lead to any loss? Out of these three subfigures, ...
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1answer
58 views

How to select resistor values for passive mixer

Total newbie question: I wanted to buy a passive audio mixer, and I wanted it to be cheap. I picked up one of these in a hurry, only to realise that it's a switch. But hey, it's cheap, so let's make ...
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1answer
47 views

Mixer LO to IF Isolation vs. 1*LO - 0RF Spur

I am working on a simple digital radio receiver and am confused by the difference between the LO to IF leakage vs. the 1LO - 0RF spur. These two tables in the datasheet of the Analog Devices HMC218B ...
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101 views

How to make a two channel mono mixer with in balance control into stereo output

I thought I wanted a circuit that was a basic pan control, but after mapping it out it isn't so standard after all. The final design will have this exposed: two mono inputs (left and right), one ...
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38 views

How could I create mixed audio, with a single PWM output?

Background: I recently made a project which emits pure tones on a speaker, and it got me thinking about how I was restricted to simple pitches. How would I simulate a chord if I can only play one ...
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20 views

How Can I use the Statz FET model?

First of all, my question might be dumb, but i've just started designing microwave circuits, I don't have any experience. I'm designing a simple FET-mixer. For the FET,I chose the low noise ATF-33143. ...
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1answer
130 views

LM393 comparator misbehaving and causing issues

I've been stuck on (what seems to be) a very unusual issue with a little audio circuit I’m designing. I wonder if anyone here can quickly highlight the flaws of my design and/or offer an insight into ...
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1answer
90 views

Feasibility of rat-race as RF mixer without active devices

My understanding is that RF mixers generally use some sort of active device (sometimes diodes) to produce output rich in harmonics, and rat-race couplers can be used to get the sum or difference ...
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52 views

What does it mean to short circuit a transmission line stub at a specific frequency?

I'm currently designing a microwave FET mixer right now, and I have to short-circuit the FET's drain at LO frequency and its harmonics. I've checked the "stub" article in wiki, and it says ...
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1answer
64 views

Question of possible circuit

Suppose we have an alternating signal and another signal is produced in the loop which is DC. Is there a circuit which tracks down the DC signal even if it is mixed with an AC signal?(somehow removes ...
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78 views

2 channel audio splitter passive

I have a Scarlett solo like the one above and I need a way to split the output of the Mix boards Auxiliary output into two level controlled signals. This Scarlett puts the Instrument on the left ...
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73 views

Audio mixer on battery power

I have an audio mixer which can run on two 9V batteries in series. I'd like to run it off a single 12V supply. Can I use two 12V-9V DC-DC converters both running off a 12V battery? Will the ...
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1answer
64 views

Trouble designing and understanding lowpass filter in analog (mixer) phase-locked loop (PLL)

I'm trying to design a software-based PLL that mimics the behavior of an analog PLL based on a 4-quadrant mixer as the phase detector (PD). The input signal is a sinusoid of unknown frequency between \...
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2answers
32 views

Questions regarding an upconverter topology (beating behavior, P1dB and compression)

This following diagram is taken from the textbook “RF Microelectronics” by Prof. Razavi. The following points are my understanding about this upconverter topology: There are two mixers in this ...
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Questions regarding an upconverter topology (biasing network and small overdrive problems)

This following diagram is taken from the textbook “RF Microelectronics” by Prof. Razavi. I have a number of questions regarding this upconverter topology. Q1 How can we tell from this upconverter (or ...
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47 views

How to simulate commercial Double Balanced Mixer in ADS

I need to simulate ADE-1 from the Mini-circuit in ADS. I use this circuit simulation in ADS. . My RF source (P_1Tone) and Lo source, in reality, generate a 2dBm and 10dBm sinewaves. However, in ...
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102 views

How to send this signal to a mixer?

I have the receiver which works when I wire a Hifi on the output. But when I try to send the signal to the port 2/3 of the following mixer then I don't have any signal anymore. I guess I need to ...
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54 views

How To Make A Two-Channel Audio Mixer?

I'd like to make a 2-channel audio mixer. I'll connect one of the entrances to my phone with an aux cord. I'm going to put my headphone mic on the other one. I'll also connect a potentiometer to both ...
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111 views

Panning between two active audio signals

I want to have a circuit that pans between both my active pickups. I have designed a simple summing opamp with a 50k center click potentiometer acting as a panner but even though it worked, when at ...
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24 views

What is the difference between IQ mixers and normal mixers?

What is the difference between IQ mixers and multiplication mixers? How do we know which ones to use?
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1answer
121 views

6-channel piezo buffer jfet circuit

Even though I'm a total beginner at electronics, I've decided to build a 6-channel piezo pickup buffer/mixer unit, for a stringed instrument. It should fit into a typically sized electronics cavity, ...
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1answer
111 views

Low pass filter target frequency for a mixed signal frequency synthesizer

I'm building a frequency synthesized local oscillator with coarse and fine tuning to span 30.5 to 32MHz. The design follows the following block diagram (bits not essential to this question removed ...
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1answer
91 views

2 LEDs for a mixer, one for signal monitor and another for mute status

I'm sorry I know I already asked for the similar question but now I learned how to properly ask my question and I will detail it more on this thread. I have a DIY mixer on breadboard right now. It's ...
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1answer
37 views

Why doesn't the microwave motion sensor make its output negative when the object go away from it?

this the link of datasheet for the sensor hb100 http://www.theorycircuit.com/wp-content/uploads/2016/09/HB100_Microwave_Sensor_datasheet.pdf after I had got the results I noticed I couldn't catch the ...
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112 views

Mono to stereo circuit only if one cable is plugged in

Im not sure how to phrase my question or what to google, but does anyone know how this feature is implemented (eg a simple example circuit): On some audio mixers, if only the left channel is plugged ...
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1answer
85 views

Why is my mixer circuit lowering the signal?

I have made a really simple mixer, to be used with both audio and control signals in a modular system: This should if I understand it correctly give "about" 1:1 (1:0.99 in simulation) ratio beetween ...
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130 views

Simple stereo audio mixer power supply

I am trying to build myself a very simple audio mixer that can take 3 line-level inputs and create a single output for a set of powered PC speakers. I found a schematic online (here) which I have ...
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1answer
67 views

Here is a design for a RGB color mixer. Is it fine, or did I mess up somewhere? Is there room for improvement? [duplicate]

LED strip has resistors built in. 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,...
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39 views

Higher IF can cause clock jitters?

I was reading about Intermediate Frequency on Wikipedia, and it says that if the IF is too high, it can cause clock jitters. This is the first time I hear about this, and I cannot find any references ...
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203 views

Grounded coplanar waveguide differential gap

I'm driving an ADL5802 RF mixer with a 5400BL15B050E RF balun. The balun turns a single ended signal into a differential signal on balanced lines for the mixer. In my attempt to match the balun ...
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97 views

What is the purpose of this capacitor in the SA602A circuit and how do I choose its value?

I'm trying to use the SA602A mixer and I'm not sure what the capacitor between the emitter and the base does. I'm using this mixer because I've seen it being used in the Norcal40. However in the ...
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1answer
65 views

What does a discrete component mixer look like?

I'd like to make a poor man's mixer from scratch. Something that can down convert 7MHz to 100KHz. What would the circuit look like using only BJT/FETS or diodes? EDIT:I found some some using diodes. ...
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85 views

Sound through the earphone is also sent to the amplifier when using a jack splitter after a audio mixer

I implemented the following audio mixer circuit with just 2 input audio sources: http://www.theorycircuit.com/audio-mixer-circuit/ Both sounds got mixed properly. Then, at the end of that audio ...
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2answers
444 views

Design review - RGB LED color mixer using PWM

I'm trying to make an RGB color mixer. LED strip runs on 0.5-2A. It has internal resistors. LED Strip needs 5v, has one pin for that, one for red, one for green, and one for blue. Each LED module that ...
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1answer
69 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
79 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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4answers
105 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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239 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
104 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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80 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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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
65 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 ...