UCD180 questions

[kvistarn]

ok, but when i mailed hypex i got a reply saying that 13-14vdc on the outputs are normal without any load connected....
I have +48v and -48v... what do you mean?
so power on the inputs means worthless module... hm thats sad.

[wytco0]

Originally posted by stef1777


With 2 black flat M3 bolts.

Stef1777
That's exactly how I did mine in my temp enclosure seems to work very well no temperature problems at all even at high volume for long periods. Mine does not look anything like as good as your, well done with your monoblocks.

Now how do they sound?

Could you remind me what those power supply modules are? I don't recognise them.

[Golgoth]

Originally posted by kvistarn
ok, but when i mailed hypex i got a reply saying that 13-14vdc on the outputs are normal without any load connected....
I have +48v and -48v... what do you mean?
so power on the inputs means worthless module... hm thats sad.

About that 14V on the output being normal without a load connected, explanations will be welcome!

As for the rail voltages if they are both ok well it must be something else. In any case the module is definitely defective if you see other than zero voltage on its inputs.

[classd4sure]

Is there any chance at all this could be a grounding issue??

[Jan-Peter]

When the UcD is powered on but not switched on yet and without a load you have an high impedance 14VDC at the output. This comes from an internal bootstrap circuit who creates a powersupply voltage for the Fet what is connected to the positive voltage. Is completly removed when you put a small load to the amplifier.

In the UcD400 we have mounted a small 47k resistor between the output and V-.

Nothing to worry very normal.....


Regards,

Jan-Peter

[Golgoth]

Originally posted by Jan-Peter
When the UcD is powered on but not switched on yet and without a load you have an high impedance 14VDC at the output.

What, that module hasn't been turned on? Well, we never thought about that one

[Jan-Peter]

More explanation;
Connect +45V / 0 / -45V to the UcD180. Do not yet connect the /ON line to ground. So the voltage is connected and there is no load at the output of the amplifier. Now there is an +14VDC at the output, because of the internal bootstrapcircuit. When the amp is switched ON this voltage is directly removed, or when you connect a load to the output it will be also removed.

If you don't like this you can even solder a 47K resistor between -45V and the output, the voltage will go to zero and has a high impedance. In a way it will even reduce the small thick what you hear when the amp is switched

Regards,

Jan-Peter

[stef1777]

Originally posted by wytco0
Could you remind me what those power supply modules are? I don't recognise them.

Custom made. Very basic circuit.

PSU for ONE UcD180.

4 x 10000UF 63V BHC slit foil
2 x MCap 2.2UF
4 x IR hfa25pb60
4 x Wima MKP2 22nf 100V
1 x slime line toroid 160VA 2 x 32V (I got 47V at the UcD power connectors)

[Jan-Peter]

Stef1777,

Very good setup, the BHC slit foil is HIGHLY recommended.

Regards,

Jan-Peter

[ewildgoose]

Where did you get your PCB made up in the end? I have never built a pcb before - would you consider getting a batch of these made up for a group buy?