UCD180 questions

[stef1777]

Originally posted by Yves Smolders
Don't do 1.

UcD feedback is optimal when the - terminals of the speaker outputs are not connected to a common ground. Using common ground will affect quality!

This has come up at the UcD400 thread also, but for another reason - a DC protection that took all speaker grounds together.

Don't go cheap on a few inches of speaker cable when running these wonderful modules!

You're right and in fact my problem is here. What should I do when using a CC protection circuit (with common ground for the five channels)?

Stephane

In my drawing, speaker ground are not connected yet.

[wildbox]

Hi guys, nice to present worlds first automotive UcD.



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Caps: nippon chemi_con 17000uFx90V (4pcs)
(OEM for ML)

Currently running with ScanSpeak 8545K00 (10 ltrs sealed) +
Eton ER-4 (ribbon) (first order both so far).

Regards from Moscow.

[SEIJI]

Hi All,

May I know what's the (/ON) on the UCD180 input pin for? should I connect this /ON pin to power supply ground to un-mute the amplifier or should I leave it open for proper amplifier operation?

Any kind advise would be great............

Thanks............

[lucpes]

Originally posted by SEIJI
Hi All,

May I know what's the (/ON) on the UCD180 input pin for? should I connect this /ON pin to power supply ground to un-mute the amplifier or should I leave it open for proper amplifier operation?

Any kind advise would be great............

Thanks............

Yes, connect to supply ground for normal operation. Eg - you may use a switch on the case to mute the amp.

[patriz]

I'm having problem with the small circuit for silent turn off.
I'm using the below circuit with few changes 1N4148 diode and 2N2222 bjt . In a board ,it is travelling to Hypex, I had intermitting signal output , then once turned off and then on it went completly silent with 9,7Vdc at the output and no signal . I completly semiconductors in the silent circuit seem to be ok and circuit cecked several times.
What could be the problem?
Giorgio

[patriz]

Originally posted by stef1777
The JP's mute circuit.



And the PCB is here: http://audio.cyberkata.org/UcD180/UCD_PSU.pdf



T1 = 2N2222A
R1 = 100K
C1 = 220 nF

Ok this is the circuit
Giorgio

[stef1777]

The circuit should work. I'm using it.

Check your ground connection.

[patriz]

the circuit is in the same board with the diode rectifier, ground circuit is connected to central transformer wire and than to chassis.
Giorgio

[stef1777]

First to do.

Bypass the circuit and check the module with a direct mute's ground connexion.

[patriz]

Done it, 8R power resistor as load and no signal at the output except 9,7Vdc regardless of the 33k resistor betwen -V and output I added to avoid the Vdc at the output with no load.