UCD180 questions - Page 119

troystg · 30th March 2005, 03:26 PM

Hi All-

I have a pair of the 180's with AD chip and was wondering if I could implement a high pass function on the amp.

I have these modules as part of a 3 way bi-amped speaker and would prefer not to use an additional high pass before this module. If I can get the buffer on the 180 to perform a 6-12db slope I could eliminate another component in the chain all together.

Ideas?

The Louis Erath Feedback controller module for the bass unit has a 2 way elec. x-over built in to cross over the UCD180's but I would prefer to take that HP out of the chain if possible..

Currently the LWE FCN has a hp freq of 400hz but that point can vary considerably. 6.5" mid x'ed-over to 2 tens...

Thank you in advance,

Troy

richie00boy · 30th March 2005, 04:21 PM

You could implement a 6dB/oct filter with just a change in the UcD input capacitor, but 6dB/oct is a very poor solution to an active crossover.

troystg · 30th March 2005, 04:56 PM

Hi richie00boy-

Thanks for the reply.

I was hoping you could filter the feeback loop or implment another part on the input to the amp from the AD chip or what ever... And I "think" cascaded 6db/oct filters would be better than the current "extra" device solution...

pa · 30th March 2005, 07:28 PM

Hi !i
i own 3 ucd 180 modules Version 2 Standard with 5532... I've sucessufully updated my modules with 8620 (+zeners) If i'm right input resistors wich defines input impedance are R13 and R46 on the edge of the board under the input signal connector isn'it ? those 2 resistors are written 1003 (doesn't mean 100k ? but i was thinking it was only 10K... to confirm i've measured 100k with a multimeter between signal - an signal ground and about the same between signal + and signal ground on the sound input molex connector.

So does it means i already have 100k input impedance ? or does impedance change at runtime and i have to replace some resitors to get this ?
thanks in advance for your help...
PA

Hans L · 31st March 2005, 08:43 AM

Quote:

Originally posted by pa
Hi !i
i own 3 ucd 180 modules Version 2 Standard with 5532... I've sucessufully updated my modules with 8620 (+zeners)

What are these zeners? Is that something yo have to do if you replace the 5532 with the 8620? I was thinking about getting a few 8620 for repacement and to build an active xo with.

pa · 31st March 2005, 10:22 AM

Yes, it is BZX c 12 Volts smd zeners the 8620 works with a lower voltage...

Hans L · 31st March 2005, 10:47 AM

Quote:

Originally posted by pa
Yes, it is BZX c 12 Volts smd zeners the 8620 works with a lower voltage...

Merci,

I did a search for this part at rs-components where I'll probably be ordering more stuff and came up with "Diode, Zener, axial, BZX79, 12V "(BZX79C12A26A). Not smd, but I think that matches my soldering skills better.

Coud you please explain were the zener is supposed to go and what the orrientation of the zener is? You may have noticed I'm not an EE

Thanks again!

pa · 31st March 2005, 04:00 PM

the zeners are d1 and d2 near the two transistors... but i don't think replaceing it with a standard package zener will be much easier, the board is not designed to support it, you could test that on an old pc motherboard before...

the (-) of the zeners are on the same side as t3 (you could see a small white line on the diode).
PA.

lucpes · 2nd April 2005, 04:14 PM

Is this 12V zener ok for the 15V zener replacement?

http://uk.farnell.com/jsp/endecaSear...=3050774&N=401

Jan-Peter · 2nd April 2005, 04:24 PM

No!

You better us this one; http://uk.farnell.com/jsp/endecaSear...U=935670&N=401

Regards,

Jan-Peter

30th March 2005, 04:21 PM	#1182
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	You could implement a 6dB/oct filter with just a change in the UcD input capacitor, but 6dB/oct is a very poor solution to an active crossover. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

30th March 2005, 04:56 PM	#1183
troystg diyAudio Member Join Date: Apr 2004 Location: Lousy Anna	Hi richie00boy- Thanks for the reply. I was hoping you could filter the feeback loop or implment another part on the input to the amp from the AD chip or what ever... And I "think" cascaded 6db/oct filters would be better than the current "extra" device solution... __________________ Troy Thinking positive doesn't make things better, it makes you a better person.

2nd April 2005, 04:14 PM	#1189
lucpes diyAudio Member Join Date: Dec 2003 Location: Iasi	Is this 12V zener ok for the 15V zener replacement? http://uk.farnell.com/jsp/endecaSear...=3050774&N=401 __________________ Deep down inside.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

30th March 2005, 03:26 PM	#1181
troystg diyAudio Member Join Date: Apr 2004 Location: Lousy Anna	Hi All- I have a pair of the 180's with AD chip and was wondering if I could implement a high pass function on the amp. I have these modules as part of a 3 way bi-amped speaker and would prefer not to use an additional high pass before this module. If I can get the buffer on the 180 to perform a 6-12db slope I could eliminate another component in the chain all together. Ideas? The Louis Erath Feedback controller module for the bass unit has a 2 way elec. x-over built in to cross over the UCD180's but I would prefer to take that HP out of the chain if possible.. Currently the LWE FCN has a hp freq of 400hz but that point can vary considerably. 6.5" mid x'ed-over to 2 tens... Thank you in advance, Troy

30th March 2005, 07:28 PM	#1184
pa diyAudio Member Join Date: Nov 2001 Location: France	Hi !i i own 3 ucd 180 modules Version 2 Standard with 5532... I've sucessufully updated my modules with 8620 (+zeners) If i'm right input resistors wich defines input impedance are R13 and R46 on the edge of the board under the input signal connector isn'it ? those 2 resistors are written 1003 (doesn't mean 100k ? but i was thinking it was only 10K... to confirm i've measured 100k with a multimeter between signal - an signal ground and about the same between signal + and signal ground on the sound input molex connector. So does it means i already have 100k input impedance ? or does impedance change at runtime and i have to replace some resitors to get this ? thanks in advance for your help... PA

31st March 2005, 10:22 AM	#1186
pa diyAudio Member Join Date: Nov 2001 Location: France	Yes, it is BZX c 12 Volts smd zeners the 8620 works with a lower voltage...

31st March 2005, 04:00 PM	#1188
pa diyAudio Member Join Date: Nov 2001 Location: France	the zeners are d1 and d2 near the two transistors... but i don't think replaceing it with a standard package zener will be much easier, the board is not designed to support it, you could test that on an old pc motherboard before... the (-) of the zeners are on the same side as t3 (you could see a small white line on the diode). PA.

2nd April 2005, 04:24 PM	#1190
Jan-Peter diyAudio Member Join Date: Sep 2003 Location: -	No! You better us this one; http://uk.farnell.com/jsp/endecaSear...U=935670&N=401 Regards, Jan-Peter

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)