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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56 views

Help in smoothing signal output from a frequency mixer

I have a circuit with a TFM-3MH+frequency mixer. I need to output a low frequency signal of 10-100Hz. The signals that I'm sending to the input ports from a signal generator are: Sine wave of ...
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1answer
36 views

Where to add equalization in active audio mixer?

I want a 2-input summing amplifier where I can adjust the amount of signal from each source with a single potentiometer. I intend to hook up two microphones (Shure SM57 and Audio Technica ATR 1500, ...
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1answer
30 views

Need to mix an audio signal from a low power device, into a high power speaker

Basically, I want to take a cable going from the car audio amplifier to a speaker which is sending around 50W of power, that cable, and put a mixer in there, where I will inject an audio signal that I ...
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1answer
51 views

Overall Gain for Mixer Circuit

I am working on an audio mixer circuit for balanced studio gear. The circuit consists of two unity gain balanced line receivers (THAT1200), going into a pair of voltage dividers controlled by a shared ...
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2answers
134 views

Impedance transformer, how to measure

I am preparing to do some RF mixer experiments with the SA612 Gilbert cell mixer. I started out with the impedance matching as I understand that the input and output need to be matched. From what I ...
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1answer
43 views

Separate "voltage dividers" for multiple AC sources

Say we have two AC sources in a circuit. Is it possible to create separately control the output coming from each source using voltage dividers? (No op-amps) E.g. So that you have $$V_{out}=aV_1+bV_2$$ ...
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1answer
88 views

Is there a simple fix for summing 2 AC signals?

I have seen many mixer schematics. They are pretty much always the same - a stack of resistors. Even some DJ mixers using the SSM2164 simply joined outputs followed by an opamp. The same thing always ...
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2answers
51 views

Measuring the amplitude of a nV signal of known frequency and phase using AD633

I am wondering if there is a circuit to measure the amplitude of a sinusoidal signal of known frequency and phase that is induced in a pickup coil. The amplitude would be in the range of 0nV to ...
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28 views

Multi carrier frequency conversion and phase noise

I have a oscillator with a phase noise mask that was represented in dBc at specific offsets from a carrier. Two options with a multicarrier signal going into a converter, apply the phase noise mask (...
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1answer
178 views

Building a matrix audio mixer

I'd like to build a 4 in, 4 out, 9 V powered audio matrix mixer. Basically it's a mixer where each input has a knob to control the amount sent to each output, effectively forming a routing matrix, ...
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1answer
88 views

Minimum RF power for usable operation of mixer

I am working on some down conversion process. I will have an LO of 410 MHz, an RF of 400 MHz. And I will use MAX2682 400-2500 MHz downconverter mixer IC from Maxim Integrated. LO power will be about 2 ...
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46 views

RF signal detection vs mixer and amplifier noise

What I am trying to do is some sort of amateur radio. But not exactly a radio, for now I will just detect the presence of a signal. I will synthesize an RF signal with a frequency synthesizer, ...
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39 views

Using diy lm386 preamp on standard commercial amp?

I have a small intercom-like device that has been siting around. It looks something like this. I suppose that inside is just a basic elect-mic and a button. Also i have an power amp which i used to ...
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1answer
84 views

Stereo channel strip based on NE5532

I want to build a stereo channel strip, using the NE5532 IC. It should feature 2 mono inputs with volume control, mute switch and pan control going to a stereo output with unity gain. In the schematic ...
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41 views

Analog mixer design help choosing between 2 states

I have designed 2 types of mixer an additive and a substractive one: The additive one is a practical application of Millman's theorem connected to an opamp: simulate this circuit – Schematic ...
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70 views

Design of a Frequency Mixer

I am quite new to this subject. I want to design a frequency mixer to mix a carrier frequency of 100 MHz with a 20 kHz signal. I found the attached circuit. It seems quite a simple circuit to multiply ...
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2answers
91 views

Why does my summing mixer max out at 5.39V when my rails are roughly +/- 11.7V?

I've been working on this project to sum and scale DC voltages from 2 sets of four 0-5V variable voltage dividers, into two separate mixes with identical circuits. In my previous version, I fed the ...
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2answers
55 views

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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2answers
49 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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48 views

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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1answer
124 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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48 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
172 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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27 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
94 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
60 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
84 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
93 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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1answer
169 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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1answer
46 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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24 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
173 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
109 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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56 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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1answer
128 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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76 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
76 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
36 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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18 views

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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84 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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1answer
108 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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101 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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2answers
189 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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28 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
180 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
122 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
115 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
55 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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2answers
163 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 ...