how to control the volume of a tv with potentiometer
According to the integrated datasheet, the volume control is controlled on pin 9, between 0V and 1.25V.
Check the images in the answer.
This IC does not allow to raise the audio input and connect a potentiometer, because it is a digital signal with 2 inputs. One positive and one negative.
Ok buddy good I connect the 6 pin isolate it and in series connect it between 1/2 pin and the 3 gnd but the bad thing is that when the volume goes down it has a noise and I also saw that the gng is in bone general the gnd is of the whole chassis and when the audio goes down but not everything has an ugly sound ... and now that I have to connect the potentiometer I isolate the pin 9 and in series between 1 and 2 and the 3 gnd really colleague ...
Looking at the Pot from the front, on the left pin, Pin 1 goes GND, the center pin 2 is connected to the amplifier, Pin 3, the one on the right is where the audio coming from the Jungle comes.
You can also leave everything as it is and use the own digital volume control of the audio IC, varying the reference signal applied to Pin 9, connecting the Pot in the same way, Pin 1 of the Pot to GND, Pin 2 or center to the pin 9 of the audio IC, and Pin 3 to the signal coming from the Jungle.
Ok colleague Jose Ortiz are that thank you very much commented how I'm doing ok colleague
Have you checked if the reference voltage that reaches pin 9 of the audio IC varies from 0 to 1.25V when moving the TV volume control? Tracked to the UOC where it originates, there may be failed components in that line that can cause the TV to keep the audio to the maximum or minimum so you move the volume bar.
Hello good colleague, he said that putting potentiometer at the entrance of the IC does not control bone either between pine that comes from the micro and the audio ic and nothing when lowering only comes out follows a blurred sound ... and the voltage of pin 9 is Well all....
You know colleague in this case before I did not give the keyboard and then the microprocessor and the previous micro era was short. Om8370PS / N3 / 2 ... That was his original micro of that TV and then look for more than a month that microprocessor. And there was and then I had to adapt the microprocessor code om8370PS / N3 / A good in the last code ah varies
There is where that last code varies. And then turn on everything normal comes out. All channels and everything and it is just that you can not control the volume ... and then to record the eeprom memory I only get data for the Om8370PS / N3 / 2 ... and Not for the Om8370PS / N3 / A maybe he had a colleague his microproc data
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Colleague told him that I got the data from the eeprom memory and reprogram it and I didn't do the test with three data but nothing goes on with the high volume ...
Ok, we will search our database to see if we help you with any data for that micro, Do not comment if you did the test by varying the reference signal applied to Pin 9, connecting the Pot in the same way, Pin 1 of the Pot to GND , Pin 2 or center to pin 9 of the audio IC, and Pin 3 to the signal coming from the Jungle.
Ok buddy well I did not do the test on pin 9, I have done it and commented colleague and it is 50k the potentiometer
Colleague told him to isolate him as you indicated. Pin 9 isolates it ... and connects in series the bone potentiometer pin 1 of P a gnd and pin 2 of p to pin a »9 of the audio ic. And the three then to the micro signal ... and then decreases but not at all colleague ...
Colleague is VERY right ... So to test the pot was with some leakage and then I put another. Potentiometer and then colleague is a genius and is already reducing the volume to a minimum. And tmb everything goes up to the maximum good colleague thank you very much connect it as you indicated is a colleague genius ... Well, I describe it. As I indicated ...
Pin 1 of the ground potentiometer and pin 2 center point to pin 9. Of the audio ic. And pin 3. Del pot. To the signal that comes from the MICROPROCESSOR. And now it is solved ... thank you very much colleague JOSE ORTIZ and tmb thanks to all the other colleagues