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Old 14th January 2013, 07:46 PM   #18971
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The player is owned by... my boss!
Don't want to be fired
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Old 15th January 2013, 05:59 AM   #18972
6h5c is offline 6h5c  Netherlands
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Ow, you'd better be extra careful then

And make sure it sounds good!
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Old 15th January 2013, 07:11 AM   #18973
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Originally Posted by Malefoda View Post
The player is owned by... my boss!
Don't want to be fired
Hi Malefoda

if i was you, i will wait until someone attach picture
im not expert
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Old 15th January 2013, 07:59 PM   #18974
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Hi Pocoyo, I clearly see what have to be done, but I may put a picture when it's done for illustration purpose Good idea!
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Old 20th January 2013, 03:32 PM   #18975
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Originally Posted by 6h5c View Post
I see what you mean, but your drawing is correct. The decoder will pull down the voltage through the diodes, so it controls the voltage at that point and thereby the muting. POWM provides voltage, but through the 47k resistor. So the moment the decoder starts pulling current through the diode, this voltage drops fast to around 0.6V. You may have to lower RN31 to 1k to get it working properly.

Ray
@RAY: I have installed a relay operated muting circuit according to your advise and it works like a charm. Now there is no cracking annoying noise when switching off the CD63. Thank you very much.

Initially I used a 47 ohm resistor to connect the RCA output to ground on each channel when the CDP is not playing but it did not eliminate the cracking noise on switching off the player. Eventually I remove the resistor and connect the RCA output to ground directly through the NC relay and it worked. I hope this arrangement will not cause any harm to the opamps as I have a 4.7uF muting capacitor connected between the RCA output and the opamp.

As a matter of interest on the top right hand corner in the photo there is a low noise voltage regulator using LT1764 which I use to replace the stock 7805 regulator supplying +5V to the circuits.
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File Type: jpg Muting.jpg (598.5 KB, 252 views)

Last edited by higlander; 20th January 2013 at 03:36 PM.
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Old 20th January 2013, 05:45 PM   #18976
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I want to do this. Is that one of those eBay boards? I tried to buy one but he won't ship to Canada. I expect I'll end up building one on veroboard instead.
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Old 20th January 2013, 06:31 PM   #18977
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I want to do this. Is that one of those eBay boards? I tried to buy one but he won't ship to Canada. I expect I'll end up building one on veroboard instead.
I bought it from the eBay which is sent from Hong Kong:
DPDT Signal Relay Module, 5Vdc, TAKAMISAWA RY5W-K Relay. Has Assembled. | eBay

I used a 5V relay instead of a 12V one. It depends where you want to tap the source out.

It took ages (about 2-3 weeks) to arrive the UK and I think they will ship it to Canada. It is well packaged, nicely made, handy and cheap - excellent product. It should be cheaper than making one yourself
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Old 20th January 2013, 07:31 PM   #18978
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Originally Posted by higlander View Post
Initially I used a 47 ohm resistor to connect the RCA output to ground on each channel when the CDP is not playing but it did not eliminate the cracking noise on switching off the player. Eventually I remove the resistor and connect the RCA output to ground directly through the NC relay and it worked. I hope this arrangement will not cause any harm to the opamps as I have a 4.7uF muting capacitor connected between the RCA output and the opamp.
I think I found what had come wrong . I connected the 47R to the RCA output and then ground it by the NC contact of the relay which I think is wrong (in this case the RCA still has output signal and the 47R only ground a bit of the signal). What I should do is to put a 47R in series between the 4.7uF isolating cap and the RCA output and the NC contact should connect to the RCA output after the 47R and to ground. When the NC contact is closed then the output signal is completely short to ground. I will modify the circuit when I have the time.
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Old 21st January 2013, 06:59 AM   #18979
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I was just about to post that, but you already figured it out
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Old 21st January 2013, 08:39 AM   #18980
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I was just about to post that, but you already figured it out
As a matter of interest, if I don't have the 47R and short the output directly to ground what will be the effect on the circuit ?
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