input switching design for balanced line stage

ijomojo · 22nd January 2005, 11:19 AM

I am planning to do my first amplifier-project, the bzls.

As I'm a newbie in circiut design I spent long nights reading up and down through the net to gather information

The result is a never ending list of links and many useful hints on the topic - thanks to this forum.
What I didn't find until now was a layout to make an appropriate input switch for the amp.

It would be nice if someone could help me!

Joseph

Nelson Pass · 23rd January 2005, 12:59 AM

If you want to switch more than 2 inputs, you're stuck with
4 poles of switch per input. Practically speaking this is two
2 pole relays per input stereo pair.

gearheaddruid · 23rd January 2005, 02:20 AM

Joseph, I have used digital switches for such things in the past. The new generation of digital controlled analog switches have an on resistance below 10 ohms. They can be break before make and use bcd control or direct control. If you are interested, let me know and I can forward the info to you.
If you have sources with unbalanced output, check out Analog Devices SSM-2142 balanced line driver. This chip is used in 90% of the mixing consoles I have worked on. It also makes an easy way to bridge a stereo or two mono amplifiers. Regards, Steve

ijomojo · 23rd January 2005, 02:02 PM

Thank you for your replys
I'm planning to switch 4 inputs
As I have some MEISEI relays (alternative for TAKAMISAWA relays?) and a couple of DPDT switches (crossbar), I would like to use them if they are suitable.
Are they

regards, Joseph

22nd January 2005, 11:19 AM	#1
ijomojo diyAudio Member Join Date: Jan 2005	input switching design for balanced line stage I am planning to do my first amplifier-project, the bzls. As I'm a newbie in circiut design I spent long nights reading up and down through the net to gather information The result is a never ending list of links and many useful hints on the topic - thanks to this forum. What I didn't find until now was a layout to make an appropriate input switch for the amp. It would be nice if someone could help me! Joseph

23rd January 2005, 02:20 AM	#3
gearheaddruid diyAudio Member Join Date: Dec 2004 Location: Overland Park, KS	Switching balanced inputs. Joseph, I have used digital switches for such things in the past. The new generation of digital controlled analog switches have an on resistance below 10 ohms. They can be break before make and use bcd control or direct control. If you are interested, let me know and I can forward the info to you. If you have sources with unbalanced output, check out Analog Devices SSM-2142 balanced line driver. This chip is used in 90% of the mixing consoles I have worked on. It also makes an easy way to bridge a stereo or two mono amplifiers. Regards, Steve __________________ Finding new ways for the extreme mis-application of high tech!

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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Balanced line stage- input or output attenuator	nobody special	Pass Labs	4	7th April 2006 01:18 PM
balanced input stage	sonix	Tubes / Valves	54	5th June 2004 02:47 PM
Balanced Zen v5 + balanced Zen line stage	Adrie	Pass Labs	0	30th May 2004 05:27 PM
Balanced Input Stage	Bukitoo	Solid State	5	11th March 2004 03:03 AM
Zen Balanced Line Stage Balanced vs Unbalanced	macka	Pass Labs	28	11th December 2002 06:18 AM

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

23rd January 2005, 12:59 AM	#2
Nelson Pass The one and only Join Date: Mar 2001	If you want to switch more than 2 inputs, you're stuck with 4 poles of switch per input. Practically speaking this is two 2 pole relays per input stereo pair.

23rd January 2005, 02:02 PM	#4
ijomojo diyAudio Member Join Date: Jan 2005	Thank you for your replys I'm planning to switch 4 inputs As I have some MEISEI relays (alternative for TAKAMISAWA relays?) and a couple of DPDT switches (crossbar), I would like to use them if they are suitable. Are they regards, Joseph

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