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Old 1st September 2012, 09:20 PM   #5021
jlaakso is offline jlaakso  Finland
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Quote:
Originally Posted by cab View Post
nampon puts the amp into standby, not the power supply. To put the smps in standby, you need an external signal to pin 1 of the J1 header of the smps.
nAmpon mutes the amp, but does not put it in standby. However, smps standby is invoked as you described. And that is why I asked, which way the circuit works. Trying to find out if there is suitable circuits to either auto-standby the unit or maybe IR standby function.
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Old 1st September 2012, 09:35 PM   #5022
cab is offline cab
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thanks for the correcting my misunderstanding....
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Old 1st September 2012, 10:15 PM   #5023
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Quote:
Originally Posted by Julf View Post
Do you also get the tic when leaving the nCores on, and turning off/muting the Marantz (so with the remote control cable between the Marantz and the nCores disconnected)? Would you happen to have a 12V relay handy to try a temporary test circuit to use SMPS standby instead of the Hypex softstart module?

(edit: I realize the Marantz control output can only drive 150 mA, but that should still be enough for a small-signal relay)
Leaving the Marantz on is only possible when I bypass the trigger.... I don't have an extra relay. It worked fine with the Squeezebox so I will contact Marantz about the output XLR. I don't think it's the nCore. Problem is also there when switching mute. Redesigning my powerrouting shouldn't help I guess.
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Old 1st September 2012, 10:25 PM   #5024
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Quote:
Originally Posted by Corpius View Post
Hi Audioschipper,

At the moment i'm switching the amps on with the power switch at the IEC power inlet. Because I positioned my amps and other audio gear different in my audio rack it is now a bit hard to reach. Therefore I designed a simple circuit that detects the incomming line signal and then switched on the amps. It also switched off the amps when there is no signal for about 15 minutes.

I got the schematics from Elliott Sound Products and designed a little pcb myself using his schematics. I just received the pcb's and soldered the components to it this afternoon. I'll build it soon into my amps and see how this works out. Perhaps this is also a nice solution for you? Because I had to order 10 pcs I have some pcb's left
Hi Corpus,

Looks nice! However, I think this is not solving my problem. The powerswitching over softstart is working perfect. I don't think it's in the powersection, I think it's the XLR. Other problem: I don't have any knowledge of electronics..
Thanks anyway.
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Old 1st September 2012, 11:09 PM   #5025
Corpius is offline Corpius  Netherlands
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Quote:
Originally Posted by jlaakso View Post
Does that mute the amps (nAmpon) or switch the psu to standby? This would be very useful for lot of people, at least me If I ever get to build these, that is.
It doesn't mute the amps nor does it put the smps into stand-by.

It detects if there is a incoming line signal. When it detects a signal, the output of the board goes high. 12 volts in my case, but lower voltages could also be used. It triggers a relay in the mains line so the smps gets powered, thus switching on the amps. After about 15 minutes it stops powering the relay, thus it switches back and cuts the power to the smps, thus switching off the amps.
When connecting the boards output to the stand-by input of the smps it causes it to go into stand-by when there is a line signal coming in. Now that is something you do not want .

The circuit needs to be powered with a simple separate power supply, meaning that it would be powered all the time. The way it is designed it used almost no power. Especially when a micropower opamp like the TL062 is used instead of the LM1458. Althought the LM1458 is also quite economic . When the system is idle the power consumption is almost reduced to zero.

Last edited by Corpius; 1st September 2012 at 11:22 PM.
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Old 2nd September 2012, 06:24 AM   #5026
jlaakso is offline jlaakso  Finland
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Quote:
Originally Posted by Corpius View Post
It doesn't mute the amps nor does it put the smps into stand-by.

It detects if there is a incoming line signal. When it detects a signal, the output of the board goes high. 12 volts in my case, but lower voltages could also be used. It triggers a relay in the mains line so the smps gets powered, thus switching on the amps. After about 15 minutes it stops powering the relay, thus it switches back and cuts the power to the smps, thus switching off the amps.
When connecting the boards output to the stand-by input of the smps it causes it to go into stand-by when there is a line signal coming in. Now that is something you do not want .
Thanks for the info. Could th board be modified to output 12V to smps standby when there is no signal?

The smps standby seems to work just the opposite compared to "industry standard" 12V latching trigger output found on some preamps. Of course the trigger could used to control a relay circuit which would output 12V to smps standby pin when preamp is shutdown. But that is beyond my abilities

Not even sure if the standby circuit is needed since idle loss of the unit is mere 5W. Compared to my integrated amp atm, which draws 40W when on "standby". But wanting to be greener than green, switching ncores to standby when not used. Manual switches are out of the question since there is signicant other also using theses equipment that is why I am looking for reasonably easy solution to either auto-standby the units or remote control the standby with universal remote.

Anyhow, ncores seem to be the next amp solution for me. Just need to sort out couple of other issues before purchase. I went through the the whole thread (yes, all 5k posts) couple of weeks ago. It did not help with the itch...
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Old 2nd September 2012, 06:48 AM   #5027
Corpius is offline Corpius  Netherlands
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Default Yes, very easy

Quote:
Originally Posted by jlaakso View Post
Thanks for the info. Could th board be modified to output 12V to smps standby when there is no signal?
Yes, it's very easy. Just use a NC (normally closed) relay instead of the NO (normally open) relay like I use. When using the NC relay a voltage get applied to the J1:1 input when there is no audio signal detected, thus putting the SMPS in standby. when it detect a audio signal the relay breaks the connecting so no voltage is is being applied anymore to J1:1, resulting in a normal soft start.
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Old 2nd September 2012, 08:36 AM   #5028
Julf is offline Julf  Europe
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Quote:
Originally Posted by Corpius View Post
It detects if there is a incoming line signal. When it detects a signal, the output of the board goes high. 12 volts in my case, but lower voltages could also be used. It triggers a relay in the mains line so the smps gets powered, thus switching on the amps. After about 15 minutes it stops powering the relay, thus it switches back and cuts the power to the smps, thus switching off the amps.
Indeed, if the relay is changed from a NO to a NC it would be ideal for those users who don't have a pre/DAC/Xover providing the 12V. It just feels wasteful to have a relay active all the time the amp is off. I wonder if the relay drive signal could be used to drive the SMPS standby input directly...
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Old 2nd September 2012, 09:15 AM   #5029
ChrisPa is offline ChrisPa  United Kingdom
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Quote:
Originally Posted by analog_sa View Post
Fair to assume? With hundreds out in the field no one has ever hooked a scope to the output???
Yes, very fair to assume


Since you're showing such concern it looks like you're the right one to volunteer
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Old 2nd September 2012, 09:20 AM   #5030
ChrisPa is offline ChrisPa  United Kingdom
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3Lvov

Quote:
Originally Posted by Julf View Post
Well, the gain ratio is actually 1.0791366906 (4.5/4.17) - so 0.7 dB. Anyway, still not a big difference.
Depends why you want them to have the same gain
If outs for straight biamping then 0.7dB is a big difference
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