how can I disable auto-standby on TV soundbar?

[Ian.M]

You are obviously an expert dead-bug/freeform prototyper, and I have no doubt that for *YOU* it was faster to prototype just with a soldering iron rather than switching to coding half way through.  However many here are less good with an iron and would benefit from considering the MCU approach.   

[peter-h]

It's call a "birdsnest" over here

If you use a micro then you have to birdsnest that too, or use some sort of evaluation board, or design a PCB. And you still need to solder. It's going to take way longer.

This is only a 100 quid soundbar...

[Zero999]

This circuit will inject 20kHz for 100ms every 5 mins into one of the two audio channels going to the soundbar



I am not yet sure of the required level i.e. the value of the 100k resistor on the output.

The two chips are CMOS 555s.

Why use two 555s? A single 556 will do.

And why PWM the power to the second 555 when you can just PWM the reset pin?

This circuit works at 40kHz, at a repetition rate of 100Hz, but you get the idea.



555 burst.asc

[peter-h]

The idea is to not have any power on the 2nd 555, 99.999% of the time.

Can't do that with a dual 555.

[Zero999]

The idea is to not have any power on the 2nd 555, 99.999% of the time.

Can't do that with a dual 555.

If it's about low power consumption, then two oscillators made with the '4011 or 4001 quad NAND or NOR gate IC will use less power than two CMOS 555s.

[peter-h]

That's true. And one could get into the nanoamp area with a circuit built with some discrete MOSFETs...

But even better to put this inside the soundbar.