Hello
I made this amplifier, and since I don't have testing equipment thus cannot experiment with values of components.
So, I wanna ask what is necessary to lower the input sensitivity, because current input sensitivity is around 470 mV, and I need for input signal around 900-950 mV?
Adding a resistor on signal input or changing the values of R2 and R3?
Thanks
Thanks for quick reply.
That make sense because R3 is negative feedback and with lowering this resistor, also will lower the gain of amplifier, and this will allow higher input signal.
I thought that experimenting with this resistor will do the job but I was unsure which value is enough for.
That make sense because R3 is negative feedback and with lowering this resistor, also will lower the gain of amplifier, and this will allow higher input signal.
I thought that experimenting with this resistor will do the job but I was unsure which value is enough for.
Check datasheet before reducing chip amp gain.
Not sure about this one but I know TDA7294 has a minimum gain and if you dont reach it the thing oscillates.
Not sure about this one but I know TDA7294 has a minimum gain and if you dont reach it the thing oscillates.
According to the data sheet the minimum closed loop gain must be > 24dB = x15.8 approx (bottom of Table 2 page 13/15). However the example circuit in the Data sheet (Page 6/15) shows values of 30k and 3.3k which equals a gain of just slightly greater than x10. ?? Maybe the presence of the booster transistors makes a difference.
I got caught out with minimum gain on a hybrid amp.
Because front end valve had gain I reduced chip amp gain.
Chip amp oscillated badly and radiated back into valve and all I had was an oscillator !
A bodge is to keep reduced gain is to put a 1nf across inverting and none inverting inputs.
Because front end valve had gain I reduced chip amp gain.
Chip amp oscillated badly and radiated back into valve and all I had was an oscillator !
A bodge is to keep reduced gain is to put a 1nf across inverting and none inverting inputs.