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Make A Frequency Mixer With Op Amps - Electronic Design
https://www.electronicdesign.com/technologies/analog/article/21775783/make-a-frequency-mixer-with-op-amps
The op-amp mixer uses a square-wave LO to flip the polarity of the RF input. U1b, D1, D2, R1, and R2 form an inverting half-wave rectifier, which inverts the LO, and then outputs only the positive...
Two Channel Audio Signal Mixer Using LM358-BA4560 Op-Amp ...
https://www.twovolt.com/2017/02/02/two-channel-audio-signal-mixer-using-lm358-op-amp/
Two Channel Audio Signal Mixer Using LM358-BA4560 Op-Amp. Supply 5V DC ( LM358) Supply 12V DC (BA4560) Standard Audio Signal Input; On Board Preset For Gain Set; Header Connector for Inputs, Output & DC Supply
Audio mixer using op amp | All About Circuits
https://forum.allaboutcircuits.com/threads/audio-mixer-using-op-amp.75628/
If the opamps are powered with a dual-polarity supply and the volume control is at maximum then the output level will be exactly the same as the input level if it drives a load of 1k ohms or more. The output opamp cannot drive headphones and it cannot drive a speaker. It can drive a power amplifier that has an input resistance of 1k ohms or more.
operational amplifier - Audio mixer design - Electrical ...
https://electronics.stackexchange.com/questions/479181/audio-mixer-design
Audio mixers can have many inputs sharing the same virtual earth at the op-amp Vin- input (see pin 6 of the TL084 below). This adds a lot of parasitic capacitance (purple box above) from Vin- to ground and creates a peak in the amplification of …
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