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Yes, you buffer, mono, rectify, and filter the signal, then use the presence of this DC voltage
for a timer circuit that enables a relay that switches the power on. If the DC stops,
the timer starts, and after a preset time interval, the relay and power are switched off.
It's more complicated than just that, something like this is necessary,
but it may not be everything that you need. Cebek PM-11 Audio Signal Controlled Relay Switch Module | Quasar UK
It's more complicated than just that, something like this is necessary,
but it may not be everything that you need.
Cebek PM-11 Audio Signal Controlled Relay Switch Module | Quasar UK
Hi,
I used this circuit fo many years.
It is more complicated, but it discriminates between a spike on the power line and music signal ... so it detects a music signal safely.
The switch-on is done with two solidstate relais on of which is delayed.
The first relais soft-switches the connected power electronics via a bunch of power resistors.
jauu
Calvin
I used this circuit fo many years.
It is more complicated, but it discriminates between a spike on the power line and music signal ... so it detects a music signal safely.
The switch-on is done with two solidstate relais on of which is delayed.
The first relais soft-switches the connected power electronics via a bunch of power resistors.
jauu
Calvin
Attachments
Never have done it myself, but I think it wouldn't be too hard to utilize the zero-detection offered by some DAC ICs, such as PCM1738, that puts out a logic level when prolonged digital silence is detected. That would be more reliable than directly sensing the analog signal level, especially if it is for musics of huge dynamic range, classical music for example, that a passage of pianissimo can have the amp turned off at a wrong time in the latter case. Just a thought.
i have some of these tiny modules. not used them yet. need help working out what flipping mosfet or transistor and resistor to use???? bc107?? help? then one can use them to toggle the mute/standby pinout of the amp too off. or disable the dc-dc power supply via its enable pin.
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I think i did a simple test with a led and they worked.
Wholesale 3V-12V Audio/ Video Signal Monitor AV Detection Gallery - Buy Low Price 3V-12V Audio/ Video Signal Monitor AV Detection Lots on Aliexpress.com
I think i did a simple test with a led and they worked.
Hi,
the description reads 'voltage regulator' and I guess it are Vregs with dedicated enable input.
In that case You still need some signal treatment in front of the enable input before You can use the device.
The treatment should be as such that a music signal from a certain minimum volume level on is detected safely and discriminated against noise and spikes.
But then You can use a simple comparator stage or FliPFlop instead of a Vreg with EN input.
jauu
Calvin
the description reads 'voltage regulator' and I guess it are Vregs with dedicated enable input.
In that case You still need some signal treatment in front of the enable input before You can use the device.
The treatment should be as such that a music signal from a certain minimum volume level on is detected safely and discriminated against noise and spikes.
But then You can use a simple comparator stage or FliPFlop instead of a Vreg with EN input.
jauu
Calvin
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