cs43122 output stage

Thomas Giz · 21st October 2003, 11:03 PM

Look into the attachment. I found this somewhere on the Internet. Don't remember even where. This is the part of the whole DAC circuit based on 8420 and 43122. It's only output stage for 43122. What do you think ? Does anybody know that circuit ? I'm not quite familiar with that I assume R+ and R- are inputs and right under mosfets are outputs. Any comments ?

Thanks

agent.5 · 22nd October 2003, 05:54 AM

This schematic begins here in the digital forum, do a search using "cheap 24/96 dac" as keywords. However, I think a better output stage is using tubes, such as

http://members.brabant.chello.nl/~m....tml/dactop.htm

or use subminiature tubes. Click on the 6021W Tube Dac link below:

http://amps.zugster.net/projects/sub-mini/

johnrtd · 22nd October 2003, 07:35 AM

Although the schematic looks all right I would prefer a much higher supply voltage.
You may find an alternative in our MP-DAC at www.audio.nl

John

Thomas Giz · 22nd October 2003, 06:47 PM

johnrtd

About what level of voltage are we talking here ? Do I need to do any modifications to the circuit then. My dacs output stages are mostly built on opamps but it's time to try something else/better. Did I correctly describe outputs and inputs in my first post. ?

jwb · 22nd October 2003, 07:16 PM

This is my schematic. You may freely reproduce it with attribution to me.

My drawing abilities are extremely bad of course, depite years of formal training. The terminals labelled AOUT[RL][+-] are the pins on the 43122 chip itself. R29-R31 and C33-C34 form a low-pass filter. The terminals labelled [RL][+-] are the resultant output voltages.

The circuit on the right is simply a MOSFET line driver with an active current source load. It presents a very easy load for the DAC and can drive difficult loads at the other end. Q2-Q5 are the cascoded current sources. Adjust R13 and R17 for more or less idle current. The rail voltage can be up to ± 24V, or even higher if you wish.

Connect your output wires to the MOSFET source pins.

You'll probably want to read this thread:
Cheap 24/96 DAC, Revision B.

Thomas Giz · 22nd October 2003, 07:28 PM

Thanks a lot !!! I feel much better. Let's do it now.

22nd October 2003, 07:35 AM	#3
johnrtd diyAudio Member Join Date: Oct 2003 Location: Ledegem Belgium	dac output Although the schematic looks all right I would prefer a much higher supply voltage. You may find an alternative in our MP-DAC at www.audio.nl John

22nd October 2003, 06:47 PM	#4
Thomas Giz diyAudio Member Join Date: Feb 2003 Location: CA	output johnrtd About what level of voltage are we talking here ? Do I need to do any modifications to the circuit then. My dacs output stages are mostly built on opamps but it's time to try something else/better. Did I correctly describe outputs and inputs in my first post. ?

22nd October 2003, 07:28 PM	#6
Thomas Giz diyAudio Member Join Date: Feb 2003 Location: CA	output Thanks a lot !!! I feel much better. Let's do it now.

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
cs43122 tube output stage help - based on cdenhancer II design	ackcheng	Digital Source	21	19th March 2006 02:37 AM
12v tube output stage for cs43122 based dac?	mbcouple	Tubes / Valves	10	14th August 2004 01:47 AM
cs43122 output stage, something went wrong	Thomas Giz	Digital Source	5	31st October 2003 12:19 AM
Analog buffer/filter stage for CS43122 help	KasperM	Digital Source	6	2nd January 2002 10:32 PM
Transformer in analoge stage in DAC (cs43122)	hifi	Digital Source	0	17th May 2001 08:02 PM


	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

22nd October 2003, 05:54 AM	#2
agent.5 diyAudio Member Join Date: Aug 2003 Location: San Francisco, CA	This schematic begins here in the digital forum, do a search using "cheap 24/96 dac" as keywords. However, I think a better output stage is using tubes, such as http://members.brabant.chello.nl/~m....tml/dactop.htm or use subminiature tubes. Click on the 6021W Tube Dac link below: http://amps.zugster.net/projects/sub-mini/

22nd October 2003, 07:16 PM	#5
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	This is my schematic. You may freely reproduce it with attribution to me. My drawing abilities are extremely bad of course, depite years of formal training. The terminals labelled AOUT[RL][+-] are the pins on the 43122 chip itself. R29-R31 and C33-C34 form a low-pass filter. The terminals labelled [RL][+-] are the resultant output voltages. The circuit on the right is simply a MOSFET line driver with an active current source load. It presents a very easy load for the DAC and can drive difficult loads at the other end. Q2-Q5 are the cascoded current sources. Adjust R13 and R17 for more or less idle current. The rail voltage can be up to ± 24V, or even higher if you wish. Connect your output wires to the MOSFET source pins. You'll probably want to read this thread: Cheap 24/96 DAC, Revision B.

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