Done stripping without cutting through more than the isolation .. puff
Well done! I went for the brute force method and cut the cables and soldered them back together - with increasing age, I find both my dexterity and eyesight are deteriorating, so I often have to resort to "quick and dirty"
i'm using a smps600. So if it has a standby it is fine not powering the amp down at all? Even without switching the nampon off? I just don't like the loud noise I get when I shut off the dac with the amp on.
I have not measured anything, where the heck on my dac would I measure for DC, i'm using xlr for outputs.
Yes - turn the amp off by using the smps600 standby input.
You can measure the DC at the amp output - it is DC coupled, so any DC offset at the DAC output will be amplified as well. The DAC should have an output capacitor to isolate any DC bias from the output, but that is a *should* - not all DACs do.
For emotional/religiuous/ethical reasons?
Haver a look at paragraph 8.1. nFATAL is pulled down if the amp stops oscillating and outputs a large DC - if you do your own power supply, you need to react to nFATAL by either turning off the amp/power supply, or switching out the speakers. Or you could use your speakers as very expensive fuses
Ok I just looked at the standby thing, hadn't even looked at that extra connector for the smps, didn't think I needed it. pin 1 & 2 are the standby and it says that it's normally closed, so if I put them on a switch does joining the two leads put the amp in standby and breaking the connection turns it on?
When everything is on, as normal, but no music playing. There should not be more than 50 mV (0.05V) at the output. If you have more, you need an input capacitor.
No, the "N/C" for pin 2 is "Not Connected". You need to apply a voltage between 3.3 and 12 V to turn the power supply off. I am taking it from my preamp, so that the power amps turn on/off in sync with the preamp.
P.S. just a reminder - I do not represent hypex in any way. My advice is purely based on my own experience and reading the technical specifications. YMMV. OIRVMMACTTA.
****, I just measured, I have 0.48VDC at the output! That's ten times more then what you are saying I should have!
What would be causing this? Is there a way to fix it without an input capacitor?
I realize you don't represent hypex but I do appreciate your advice and help.
With regards to the standby, is there any place to get that required voltage from smps? I'd hate to have to put another connector on my chassis or run another wire from who knows where just to put it into standby. Would be nice to keep everything inside the chassis with maybe just adding a simple toggle switch on the back or a push button on the front.
I just disconnected the input from my dac and still had 0.48VDC at the amp output with nothing connected but the speakers and my 120VAC input??
Edit - Alright just did some more testing, with no cable from dac to amp I still had 0.48VDC, as soon as I disconnect the 4 pin cable to the ncore I have 0V. So some how i'm getting DC on the output just from my chassis mount XLR connector without any external cable attached?
Edit - Alright just did some more testing, with no cable from dac to amp I still had 0.48VDC, as soon as I disconnect the 4 pin cable to the ncore I have 0V. So some how i'm getting DC on the output just from my chassis mount XLR connector without any external cable attached?
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For emotional/religiuous/ethical reasons?
Haver a look at paragraph 8.1. nFATAL is pulled down if the amp stops oscillating and outputs a large DC - if you do your own power supply, you need to react to nFATAL by either turning off the amp/power supply, or switching out the speakers. Or you could use your speakers as very expensive fuses
Thank Mr. Julf
Well this with oscillating and dc will not happen so I will forget that.
I have connected evrything in the right mannor and there is still no sound. I can measure a very small signal with my voltmeter at the output and also hear a very small signal in the speakers.
My cabinet is wood at the input and metal for the rest. Maybe this is the reason ? In the datasheet it is recommended that the RCA is not isolated ! For what reason ?
This is really an hysteric amplifier and I am tired of it allready.
Also there could be a explanation for the different red leds. On of them is separated from the rest, what is that used for ?
double check the way you've wired your (rca ?) input and what you've done with namponThank Mr. Julf
Well this with oscillating and dc will not happen so I will forget that.
I have connected evrything in the right mannor and there is still no sound. I can measure a very small signal with my voltmeter at the output and also hear a very small signal in the speakers.
My cabinet is wood at the input and metal for the rest. Maybe this is the reason ? In the datasheet it is recommended that the RCA is not isolated ! For what reason ?
This is really an hysteric amplifier and I am tired of it allready.
Also there could be a explanation for the different red leds. On of them is separated from the rest, what is that used for ?
There's no way the material you've used for the case will be the cause - unless, as a consequence, some of the connections aren't being made correctly.
The leds aren't indicators. they're components within the voltage regulators. It's just a coincidence that they also light up
Threw it together quick and dirty. The amp is now making wonderful and powerful noises on my Altec 604sWell done! I went for the brute force method and cut the cables and soldered them back together - with increasing age, I find both my dexterity and eyesight are deteriorating, so I often have to resort to "quick and dirty"
Kjartan
double check the way you've wired your (rca ?) input and what you've done with nampon
There's no way the material you've used for the case will be the cause - unless, as a consequence, some of the connections aren't being made correctly.
The leds aren't indicators. they're components within the voltage regulators. It's just a coincidence that they also light up
Yes I know leds sometimes is used as components but maybe one of them is an indicator.
I have tried the Nampon to power supply ground and also now to the ground at the RCA input together with the shield and pin 2. Pin 1 is to the hot at RCA.
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