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3 votes
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LTspice-RIAA-simulation not working out

Your output "vinyl" mimics the gain plot of the preamplifier. You need to flip things around so "vinyl" has a lower output at low frequencies and a higher output at high ...
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  • 3,745
2 votes

Symmetric audio signal output on single voltage circuit

There's a difference between: Symmetric, where both positive and negative halves of the differential signal have opposite voltage Balanced, where both positive and negative halves of the ...
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2 votes

Can't find the datasheet of cheap Bluetooth audio reciever

I found the datasheet corresponding to the AC6926A4 chip, in the following link: Encontré el datasheet correspondiente al chip AC6926A4, en el siguiente link: http://en.tome-sz.com/...
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1 vote

Stereo I2S To USB Audio

CM108 meets your need (I2S to USB). USB dongles of CM108 are sold for around $3. Set pin ADSEL high to use I2S inputs instead of internal ADC.
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1 vote

LTspice-RIAA-simulation not working out

I remember old vinyl pop-click, pop-click records. The same curve appears at https://sound-au.com/project06.htm .
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  • 2,149
1 vote

How to disable Bluetooth temporarily for line in to work in mini hifi amplifier TDA7492P?

How can I disable bluetooth temporarily for line in to work? It appears that you can't. Also this amp has no line in. Googling for 'tda7492p bluetooth amplifier board manual' shows that the 3.5 mm ...
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  • 2,520
1 vote

Switching stereo input between three stereo outputs

Just to be sure you've got the right switch, it should have 8 contacts / terminals in two groups of 4. In each group of 4 there will be 3 input contacts (call them A,B & C) and one output which ...
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1 vote
Accepted

Power supply noise reduction

To understand any filter design you need to have expectations of what is signal, noise, SNR, voltage, current, and Impedance in terms of amplitude and f. Then we can ask some better questions. But ...
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1 vote

Cheap Audio Equalizer board converted to seperate outputs

The schematic shows how graphic equalizers (when not digital signal processing) are generally constructed. There's no places in the circuit where one could tap a single band. The principle is an ...
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1 vote

Cheap Audio Equalizer board converted to seperate outputs

The opamps in this circuit are being used as gyrators, they basically transform a capacitance into an inductance that is then in parallel with another capacitance to form a resonant circuit. The ...
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  • 3,386
1 vote

How does adding a tweeter electrically affects the main driver?

so my question is whether adding these simple items in parallel can somehow affect the low frequencies too? Unlikely. I guess the capacitor and tweeter offer another current path for high frequency ...
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