I would not think so; the maximum DC gain is with the bass control at one extreme, so around 11:1
Even if the opamps had several millivolts offset difference, it's still only going to affect the DC output level of the second amp by a fraction of a volt.
Add a connection dot to the left side of R4.
The correct reference designator prefix for an opamp is U.
Other than that, looks good to me.
Consider adding pin numbers to the IC symbols. Not a critical item, but they come in handy when using dual and quad parts, and are *really* handy when troubleshooting.
The polarities for C5 and C9 are backwards. The inputs and outputs of the ICs are positive and the volume control R%12 is grounded.
It is best to use C6 to filter out hum and noise from the +12V and R13 to bias the opamp.
The polarities for C5 and C9 are backwards. The inputs and outputs of the ICs are positive and the volume control R%12 is grounded.
It is best to use C6 to filter out hum and noise from the +12V and R13 to bias the opamp.
Is there a post that talks about a signal ground issue? Polarized capacitors must have the correct polarity in a circuit and it is obvious that the - wire of a capacitor is the grounded one.
Are you referring to which diagram. The final diagram is in post 9.Is that 47uF in wrong place?
In the TDA7377 datasheet it has mentioned the amp input caps are 0.47uF in double bridge configuration.But I have put 1uF.Will it make a noticable difference?
Don't you know that a higher capacitance passes lower frequencies? The simple calculation shows that 0.47uF into the 10k ohms minimum bridged input passes frequencies above 34Hz but 1uF passes frequencies above 16Hz which is fine
The value for an electrolytic capacitor is not accurate since as a filter it does not matter. A 1uF capacitor might actually be from 0.8uF to 1.5uF.
The TDA7377 was invented by ST Micro but now is made by Coetec, a Chinese company.
Now everything is ready to check.First I checked the amplifier part.Sounds good.But only thing is I have to give more input signal.Means in the mp3 module I have to set its maximum line out signal.
Little bit doubt after coupling the tone control pre amp circuit will the overoll gain in the system gets down? There is no signal gain stage in pre amp here....!!!
Using unregulated power from a rectifier-capacitor supply may give ripple noise in your audio.
If so, you can add a regulator, such as an LM317 to significantly reduce the ripple.
The tone control pots must be linear, not audio log taper.
Of course the mid control affects the higher frequency bass a little and the lower frequency treble a little.
Here is a similar schematic and its frequency responses:
The tone control pots must be linear, not audio log taper.
Of course the mid control affects the higher frequency bass a little and the lower frequency treble a little.
Here is a similar schematic and its frequency responses: