I have DAC from diyinhk (ess9028) And when I power off there is sound coming out from speakers.. (like current from caps are released to dac output?.. just my guess)
Made recording which I add here, Dac is connected to power supply, toroidal transformer only.
Please help me identify cause if possible + solution
Made recording which I add here, Dac is connected to power supply, toroidal transformer only.
Please help me identify cause if possible + solution
If due to the charge on the supply caps, the sound will stop after some period as they discharge. Which might take a bit longer than you would suspect, depending on the total capacity of those supply caps, as well as the some other factors.
Dont know if listened to .wav files I provided. Its not that music play couple seconds after I power off. Music stops the moment I turn power switch off, then there is 3-4 sec of silence and I hear something like a sweep used for measuring speakers, then couple sec of silence, and another shorter sweep. If I measured correctly with multimeter there is about 1V on dac output when 'sweep' happens. Dont think this should go to dac out(?)
Just add the necessary and standard power on/off muting of the "shorting to GND" variant by means of a micro relay. Outputs shorted to GND released a few seconds after power on and switched to GND ASAP at power off means the power of 0 Ohm: silence.
Solved.
BTW My eyes are not what they used to be but that looks an awful lot like a ES9016 multichannel board. Yes that is 8 outputs to take care of as this DIYINHK board has no muting at all.
https://www.diyinhk.com/shop/audio-...84khz-32bit-es9016-pcm-dxd-dsd-audio-dac.html
If you also decided on no hardware volume control (so software volume control of the ES9016) besides the multichannel thingie then of course you will experience power on/off phenomena nicely amplified to the max. With hardware volume control you could simply turn volume down as a band aid. "Open" power amplifiers tend to eh..amplify all signals that appear at their inputs with their maximum gain. System choices.....
Solved.
BTW My eyes are not what they used to be but that looks an awful lot like a ES9016 multichannel board. Yes that is 8 outputs to take care of as this DIYINHK board has no muting at all.
https://www.diyinhk.com/shop/audio-...84khz-32bit-es9016-pcm-dxd-dsd-audio-dac.html
If you also decided on no hardware volume control (so software volume control of the ES9016) besides the multichannel thingie then of course you will experience power on/off phenomena nicely amplified to the max. With hardware volume control you could simply turn volume down as a band aid. "Open" power amplifiers tend to eh..amplify all signals that appear at their inputs with their maximum gain. System choices.....
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Many thanks for replies, Im just beginner in electronics. Later I want to change amp to 3x ICE Power boards. So I will have to modify output to balanced - a good moment to add muting curcuit.. btw any examples of muting circuit?
And yes for now I want to use soft volume.. till Im ready to make a preamp. I use it for 3-way active setup and dont think I would like full volume sweep wake up.
Interesting is that on power on there are no problems at all, Completely silent. Just power off gets trouble.
What I have is ES9028pro, but you are right, they use exactly same board as 9016. There been measurements on 'other' forum around 115 SINAD so I thought it will be much better aliexpress board, also seem like reference design. Think it was bad choice?
Not much to choose from when it comes to multichannel dacs. Was thinking about Motu interface, but here I have dac of similar performance + dsp at half of price + I can learn things I wanted to for a long time.
And yes for now I want to use soft volume.. till Im ready to make a preamp. I use it for 3-way active setup and dont think I would like full volume sweep wake up.
Interesting is that on power on there are no problems at all, Completely silent. Just power off gets trouble.
What I have is ES9028pro, but you are right, they use exactly same board as 9016. There been measurements on 'other' forum around 115 SINAD so I thought it will be much better aliexpress board, also seem like reference design. Think it was bad choice?
Not much to choose from when it comes to multichannel dacs. Was thinking about Motu interface, but here I have dac of similar performance + dsp at half of price + I can learn things I wanted to for a long time.