IC TDA7388, Maximum Standby Voltage (pin4)
Thanks, in the article of electronicosmx, which I had not read says that the voltage without risk is 8v, then I will check the standby stage to see if it has something damaged but I still doubt if it is specifically working with the 14v of the source.
There is not, before there is a transistor A1273, check it to see if it was damaged but everything seems fine even replace it and when you turn on the stereo sends the voltage but it does not come directly from the source
Good morning, the standby voltage of this for this TDA is approximately 5v by the resistors R505 of 10k and R506 of 22k, which form a limiting circuit.
The diagram says that on the emitter of Q501 A1273 12v comes out and this voltage when passing through the limiting resistors would reach 5v to pin 4.
In this circuit there is no resistance similar to 505 of 22k I don't know how it influences. there is only 10k
If you do not want to risk in new ADD you can place the 22k resistor as indicated in the diagram, one end over the 10k resistor and the other end to ground and tests, if it does not work you remove the resistance.
If it works, you measure the voltage that reaches pin 4 and so you leave it.
It is similar, tomorrow I review it more in detail and I tell you, but in this standby if it is more than 8 it only carries a resistance of 10k between the transistor and the leg of the ADD does not it?
Thank you very much brother
Good afternoon, I tried the idea you gave me and it worked, first I put a resistance of 22k and the voltage between 14 and 15v that came to standby low at 10v then I put a 47k and went up to 12 so I chose to try a of 14k and I got 9v then I placed the new IC and when measuring I already had 8v and the outputs working I will put to work to see if there is something that fails or the resistance is overheated and I tell you to give the issue as solved, thanks for your help
Repaired and working I left the resistance of 14 and so it worked well, thanks Milflo for your help.
