Questions tagged [summing]

For questions about summing / adding multiple signals.

For questions about summing / adding multiple signals.

92 questions
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Active analog summing circuit with very high noise floor

I've designed an active audio summing circuit that takes 8 balanced (i.e. differential) audio signals passes them through an input buffer and sums the signals for differential output. I've employed all the good practice audio design principles that…
atell soundtheory
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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 DAC made up of two 8 bit DACs. The only problem is…
quantum231
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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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3 answers

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?
diverger
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Mixing audio signals: pros and cons of using resistors instead of an op-amp

I'm working on a project that requires me to mix two audio signals from two sources (both on the same PCB). Source one is an audio output coming from the the VS1053B MP3 Audio CODEC IC , and source two is the output of a DAC ( MCP4921 ). Both these…
Jay
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4 answers

How do solar inverter systems easily add AC power sources together?

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 protect itself from reverse current coming from other…
Evan
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5
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5 answers

Single-supply non-inverting op-amp for summing DC voltages at unity gain

Is it possible to use this single supply, non-inverting, summing op-amp configuration to sum multiple arbitrary DC voltages at unity gain? I've used the inverting summing op-amp config on bipolar power supplies to sum AC and DC input voltages…
formerlolz
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In a negative feedback loop, why does increase in v_out lead to increase in v-?

I hope this is the right place to ask this question. (Please let me know if there's a better place to ask this.) Basically, I'm quite confused about how we check if we have a negative feedback loop. During lecture, when checking whether this was…
norwegian_forest
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How do you combine 2 AC power sources?

To combine 2 DC power sources , you can diode OR them both together. You can't just directly connect them together because their voltage outputs may differ ever-so-slightly, leading to imbalanced currents as well, causing one generator to try and…
Gabriel Staples
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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: $$ s = 1.m_x + (-1)^{s_x \oplus s_y} 2^{-\delta}1.m_y, $$ I'm assuming $ |x| > |y|…
user8469759
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Summing Op-Amps vs Difference Op-Amps

How do you tell the difference between a summing amplifier (non-inverting) op-amp and a difference amplifier just by looking at its configuration? Please note that in both of these cases, both the (+) and (-) terminals have inputs, thus leading to…
HDY
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DC voltage summing type circuit

I hope someone can help me. I'm not an electrical engineer by occupation. I have a need for a circuit that can do the following: Provide a steady 8 V DC output at rest. Add to that output, the voltage seen on a potentiometer wiper (0 to 7.8 V). In…
Darren
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Universal (magic) Op-Amp Fundamentals

In a recent lecture in my AC Circuits course, the professor put this slide up and hastily explained the Universal Op-Amp. Since I already struggle with circuits, let alone operational amplifiers, I did not understand his explanation very well. What…
Jared M
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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 solving equations result in this "voltage adding"…
alpersunter
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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 from it and routes this to its headset, and also…
John
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