# Questions tagged [summing]

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### Is it possible to combine two 8 bits DACs together to create a 16 bit DAC, one byte of the 16 bit word shall be sent to each of them

For two DACs, one being sent D0-D7 and the other being sent D8-D15, with power supply being 5V, if 5V is added to output of 2nd DAC and then the two DAC outputs are summed, should result in a 16 bit ...
4k views

### 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-, ...
19k views

### Inverting summing amplifier vs Non-inverting summing amplfier

As known there are inverting and non-inverting summing circuits, such as below: What's their cons and pros?
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### How do solar inverter systems easily add AC power sources together? [closed]

I understand DC power more than AC power. I know that given multiple DC power generators, easiest way to sum them is by connecting them in series. In paralel you'd need every generator circuit to ...
811 views

### Don't individual signal sources affect each other when using a summing amplifier?

I am studying the book Electric Circuits by Nilsson & Riedel. There I learned about "summing amplifiers" and how to derive equations by applying KCL at inverting input of the op amp. I see that ...
385 views

### Floating point addition. Are guard, round and sticky bit always necessaryl? analysis of a special case

I've a particular case of floating point addition. As you know for given floating point numbers $x,y$ one of the steps of the addition involves the fixed point sum:  s = 1.m_x + (-1)^{s_x \oplus ...
3k views

### Party-line / Full-duplex intercom - mixing audio signals

Party-line or full-duplex intercoms allow for the simultaneous transmission and reception of audio from all connected stations, i.e. effectively there is an audio 'bus' and each station takes a feed ...
401 views

### Antenna sector power ratio (total power)

This is maybe a very basic question, which is driving me insane, because I can't remember the theory and neither I can seem to find any source about the topic. I have an antenna, whose SPR (sector ...
568 views

### Mathematically derived waveform vs. captured waveform from an analog synthesizer

I was thinking about how the individual parameters on an analog synthesizer could be controlled digitally. What I mean is, instead of using mechanical potentiometers to adjust some quality of the ...
2k views

### Calculations for building a mixer circuit

I have been tasked with building a mixer. $V(output) = 1/2*V1 + 1/6*V2$ Thinking in terms of superposition, I assume I can hook up $V1$ and $V2$ to the circuit separately, and then sum the ...
754 views

### Non-inverting Op-Amp Audio Mixer

I am trying to make sense of the difference in non-inverting and inverting op-amp based audio "mixers". The circuits are basically summing op-amp amplifiers. Here is the part which I do not understand....
632 views

### What's the best way to mute summed stereo channels?

I am building an audio mixer, and most of the instruments produce mono signals (internally split to L/R), but want to make sure it is flexible enough to use true stereo devices, and sum to mono in my ...
41 views

### Summing Audio Channels

I’m trying to sum my car stereo output. Factory output has bass on one output and mid and tweeter on another output giving me 2 channels for left and 2 channels for right. Ideally I’d like to sum ...
569 views

### Summing amplifier with bypass

I am trying to sum three audio signals using a non-inverting summing amplifier as shown below. If I want to bypass one of those signals, what is the correct way of doing that (let's say with a switch)?...
31 views

### FFT analysis of summed signal in LTSpice

I know that simulating FFT analysis of current/voltage across a single element via LTSpice is quite straightforward. I have simulated the summation of three distinct currents in the time domain. I'd ...
42 views

### 3-to-2 line encoder (or generally 2^(n-1)-to-n) — not priority, but telling how many inputs are on?

This is not homework (not taking any classes) although it could be homework. I am wondering what is the easiest implementation using a single TTL chip or gates (fewest chip count) to encode the number ...
198 views

### Is there a limit to the number of inputs that can be summed with an op-amp summing circuit?

I'm interested in the limits you encounter if you try to add many inputs into an op amp summing circuit. I've read that the inverting configuration is more natural for adding many inputs since the ...
39 views

### Summing stereo and mono channels passively

I am trying to build a headset for use on my motorcycle which will allow me to listen to my music from my phone (stereo signal) and the incoming sound from my UHF radio (mono i'm pretty sure). what is ...
155 views

### Instrumentational Amplifier with Summing Amplifier

As you all know, most Inst. Amp. examples on the Internet have a 'Differential Amplifier' part as shown below. But, what would happen if a summing amplifier was used instead ? What kind of ...
422 views

### How can I add high and low voltage signals to a high voltage DC offset?

It's only a theorethical question, since I'm not really going to build this circuit... I'm just curious, that's all. Anyway, thats my question! I have these signals: 3 kHz, 1V (peak) 20 Hz, ...
45 views

### Does a Series Voltage Reference referencing more than one electrical block has to be buffered?

I'm planing to use a Series Voltage Reference,REF3330, as a voltage reference to three distinct parts of my circuit and i need an opinion regarding the way how to do it. First of all, the reference ...
593 views

### How can I add a stable DC voltage and a DC pulse train together?

For a project I am working on I need to take a DC voltage source, around 12V, with at least 1A of current, and I need to add it to a generated DC pulse train which will be from -4 to 4V and will be ...
473 views

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### Voltage follower/Buffer circuit as summing amp

Is that possible to use a voltage follower/buffer circuit as summing amp? In history, what kind of circuit was used for summing amp before people started to use those inverting summing amp circuit? -...