UCD 180 boxed

Bgt · 17th July 2005, 08:32 PM

JP,
Made an UCD180 boxed version but when I switched on the amp. it will give -18V on the output.
On my 400 boxed version I have the ON wire connected to ground. It switches on OK. But when I do this with the 180 it wont switch on. I have to ground it later than on switch on.
Is there any cap. I can take off at the logic gate to have it immediately switched on(when connected to ground) without an additional delay circuit?
thx, Bert

stef1777 · 17th July 2005, 09:54 PM

Quote:

Originally posted by Bgt
JP,

Made an UCD180 boxed version but when I switched on the amp. it will give -18V on the output.
On my 400 boxed version I have the ON wire connected to ground. It switches on OK. But when I do this with the 180 it wont switch on. I have to ground it later than on switch on.

Seems to be a problem related to some UcD180 v2. I've the same problem here with my UcD180 v2. The v1 I previously used do not have this problem.

It's an UcD's initialization problem (wrong startup process). This appends only when no speaker is connected to the output. The -18V (to -22V) no longer exist when a speaker is connected.

Add a delay of 3 seconds before connecting the MUTE to ground with a small temporized circuit. With this, you'll be sure to have a good startup in any case.

Bgt · 18th July 2005, 06:47 AM

Problem is I use an output relay, DC offset sensing, so when the output does not connect because of sensing a -18V it will never close. A bit of a nuissance this "ON"circuit.

stef1777 · 18th July 2005, 07:13 AM

Quote:

Originally posted by Bgt
Problem is I use an output relay, DC offset sensing, so when the output does not connect because of sensing a -18V it will never close. A bit of a nuissance this "ON"circuit.

I had the same problem on my project. Just add a transistor or an opto-coupler to your DC protection circuit to connect MUTE to ground, and switch ON the MUTE at the end of the start cycle.

The problem is not the MUTE (this is good to have a MUTE) but that the current implementation seems a little buggy.

Please post your DC circuit diagram here. I'll show you where to add the MUTE circuit.

Bgt · 18th July 2005, 08:13 AM

Hi Steff,

It is not a problem to add the mute swich on the prot. pcb but its adds up to extra parts/wire/work for no reason.

stef1777 · 18th July 2005, 08:20 AM

Quote:

Originally posted by Bgt
Hi Steff,

It is not a problem to add the mute swich on the prot. pcb but its adds up to extra parts/wire/work for no reason.

For that, you should ask Hypex.

Bgt · 18th July 2005, 08:31 AM

I adressed JP on the topic, see top.

stef1777 · 18th July 2005, 09:00 AM

Quote:

Originally posted by Bgt
I adressed JP on the topic, see top.

See it. Sorry.

In fact, the difficulty with the DC circuit is that we need to switch the MUTE ON before testing the DC... if not, we are in a bad cycle.

Mute ON with less than 3 seconds -> -18V/-22V
Mute OFF -> -12V

Bgt · 18th July 2005, 09:30 PM

fixed, just 1/2 second delay is enough.

stef1777 · 18th July 2005, 10:04 PM

the caps will be smaller.

17th July 2005, 08:32 PM	#1
Bgt diyAudio Member Join Date: Jan 2005 Location: NL, Voorschoten	UCD 180 boxed JP, Made an UCD180 boxed version but when I switched on the amp. it will give -18V on the output. On my 400 boxed version I have the ON wire connected to ground. It switches on OK. But when I do this with the 180 it wont switch on. I have to ground it later than on switch on. Is there any cap. I can take off at the logic gate to have it immediately switched on(when connected to ground) without an additional delay circuit? thx, Bert

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18th July 2005, 06:47 AM	#3
Bgt diyAudio Member Join Date: Jan 2005 Location: NL, Voorschoten	Problem is I use an output relay, DC offset sensing, so when the output does not connect because of sensing a -18V it will never close. A bit of a nuissance this "ON"circuit.

18th July 2005, 08:13 AM	#5
Bgt diyAudio Member Join Date: Jan 2005 Location: NL, Voorschoten	Hi Steff, It is not a problem to add the mute swich on the prot. pcb but its adds up to extra parts/wire/work for no reason.

18th July 2005, 08:31 AM	#7
Bgt diyAudio Member Join Date: Jan 2005 Location: NL, Voorschoten	I adressed JP on the topic, see top.

18th July 2005, 09:30 PM	#9
Bgt diyAudio Member Join Date: Jan 2005 Location: NL, Voorschoten	fixed, just 1/2 second delay is enough.

18th July 2005, 10:04 PM	#10
stef1777 diyAudio Member Join Date: Jun 2004 Location: Paris	the caps will be smaller.

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