Output circuit
The output circuit I used is a combination of a lot of other people's work. Ben Duncan for the relay muting circuit (Hi-Fi News and Record Review, Nov1987) , Paul Marchese in Audio Amateur 2, 1990 for the Fet Lt1010 output buffer/offset trim, and of course the Texas Instrument DSD1791 spec sheet pg 30.
The output circuit I used is a combination of a lot of other people's work. Ben Duncan for the relay muting circuit (Hi-Fi News and Record Review, Nov1987) , Paul Marchese in Audio Amateur 2, 1990 for the Fet Lt1010 output buffer/offset trim, and of course the Texas Instrument DSD1791 spec sheet pg 30.
Attachments
ooops
I can't seem to load a viewable image. I'll email it to interested parties.
Frustrated old Nic.
I can't seem to load a viewable image. I'll email it to interested parties.
Frustrated old Nic.
Output Muting
A suggestion for the muting, no relay click and response time.
Use the Analog Device Quad SPDT Switches. The turn On resistance is less than 35 ohms. You can get free sample from www.analog.com
Just put the switch in serie and add the needed logic to get the switch open when muting.
I will probably use that in my own 563A
Bye...
A suggestion for the muting, no relay click and response time.
Use the Analog Device Quad SPDT Switches. The turn On resistance is less than 35 ohms. You can get free sample from www.analog.com
Just put the switch in serie and add the needed logic to get the switch open when muting.
I will probably use that in my own 563A
Bye...
ADG411 Switch
By the way, this Switch is used at the input of my Mark Levinson
ML38 Preamp. I has to be good to be in this great preamp.
Bye....
By the way, this Switch is used at the input of my Mark Levinson
ML38 Preamp. I has to be good to be in this great preamp.
Bye....
ADG 411 switch
Hello Algar_emi,
Why don't you post a schematic of the logic and the pick-off point on the Pioneer so we can judge better how to use the device?
Also, why does this switch have to be in series with the signal, when all you want to do is mute the output to ground?
Please advise.
N.
Hello Algar_emi,
Why don't you post a schematic of the logic and the pick-off point on the Pioneer so we can judge better how to use the device?
Also, why does this switch have to be in series with the signal, when all you want to do is mute the output to ground?
Please advise.
N.
Muting
We want to remove all resistors from the output. To short to gnd the output, we need to let one resistor in serie with the output, then ground the output to mute.
I taught that by opening the output with the switch, that will mute the sound and there will be only the switch small resistor in serie with the output.
I just bought a 563A and I ordered the ADG411. I will try to use it this week. I may also use a 75R resistor in serie and short it to gnd if the switch open trick doesn't give good result.
I'll try to post a schematic soon.
Bye...
We want to remove all resistors from the output. To short to gnd the output, we need to let one resistor in serie with the output, then ground the output to mute.
I taught that by opening the output with the switch, that will mute the sound and there will be only the switch small resistor in serie with the output.
I just bought a 563A and I ordered the ADG411. I will try to use it this week. I may also use a 75R resistor in serie and short it to gnd if the switch open trick doesn't give good result.
I'll try to post a schematic soon.
Bye...
Output Muting
Hi,
Your plan makes sense - it is always good to try an idea in a practical way before deciding on a final course of action.
The relay I am using does make an audible click when the disk stops, starts or searches for a track. If you can get a quiet, sonically neutral solution, I would try to implement it too.
Go for it.
By the way, your site is neat.
N.
Hi,
Your plan makes sense - it is always good to try an idea in a practical way before deciding on a final course of action.
The relay I am using does make an audible click when the disk stops, starts or searches for a track. If you can get a quiet, sonically neutral solution, I would try to implement it too.
Go for it.
By the way, your site is neat.
N.
Starting my upgrade
Hi. I will start to modify my 563A tomorrow. I listen to the original 563A and was not impressed at all. I have a Copland 277 CD player used as transport and the SuperDAC low jitter from Guido Tent, with tube output, just great.
The 563A in CD is everything that a bad CD is, no timing, harsh treble, not great bass. The SACD (I used Dark Side of the Moon) section is better but not reaching the sound of my reference system.
I'm going for the full thing: new analog supply and separate new digital supplies. Replacement of all the caps as listen previously. All Panasonic FC and some Black Gate for the original op-amp section.
I will use soft recovery diodes for the +/12V audio supply. I will upgrade the existing L-R output to OPA2604 and build the new separate LT section, without coupling caps.
I can't wait to hear the difference. 😀
Hi. I will start to modify my 563A tomorrow. I listen to the original 563A and was not impressed at all. I have a Copland 277 CD player used as transport and the SuperDAC low jitter from Guido Tent, with tube output, just great.
The 563A in CD is everything that a bad CD is, no timing, harsh treble, not great bass. The SACD (I used Dark Side of the Moon) section is better but not reaching the sound of my reference system.
I'm going for the full thing: new analog supply and separate new digital supplies. Replacement of all the caps as listen previously. All Panasonic FC and some Black Gate for the original op-amp section.
I will use soft recovery diodes for the +/12V audio supply. I will upgrade the existing L-R output to OPA2604 and build the new separate LT section, without coupling caps.
I can't wait to hear the difference. 😀
Audio Analog Supply
And I was forgetting. I will use Jung SuperReg for the Analog +-12V.
Bye...
And I was forgetting. I will use Jung SuperReg for the Analog +-12V.
Bye...
Some SACDs
Hi,
Here are a few SACDs I enjoy.
Yo-Yo Ma/ Edgar Meyer/Mark O'Connor APPALACHIAN JOURNEY
(Sony Classical) Natural sounding string instruments and voices.
James Taylor OCTOBER ROAD (Columbia) Warm, good band sound with voice a bit rough and forward. One spectacular cut Belfast to Boston.
Chick Corea RENDEZVOUS IN NEW YORK (Stretch Records) Good jazz club atmosphere and good studio recording. Excellent piano.
Fabulous jazz.
The Coronation of King George II (Hyperion) Very Regal, marches and outdoor ambience, crowds, cannons, etc.
One DVD Audio. Buena Vista Social Club (Nonesuch)
This is a famous Cd redone in Hirez and it is superb for the musicianship and reverberant sonics.
OK?
N.
Your plan for the mods is very comprehensive. I can't wait for the reports. I'm particulary interested in the completely new power supply to replace the switching one.
Hi,
Here are a few SACDs I enjoy.
Yo-Yo Ma/ Edgar Meyer/Mark O'Connor APPALACHIAN JOURNEY
(Sony Classical) Natural sounding string instruments and voices.
James Taylor OCTOBER ROAD (Columbia) Warm, good band sound with voice a bit rough and forward. One spectacular cut Belfast to Boston.
Chick Corea RENDEZVOUS IN NEW YORK (Stretch Records) Good jazz club atmosphere and good studio recording. Excellent piano.
Fabulous jazz.
The Coronation of King George II (Hyperion) Very Regal, marches and outdoor ambience, crowds, cannons, etc.
One DVD Audio. Buena Vista Social Club (Nonesuch)
This is a famous Cd redone in Hirez and it is superb for the musicianship and reverberant sonics.
OK?
N.
Your plan for the mods is very comprehensive. I can't wait for the reports. I'm particulary interested in the completely new power supply to replace the switching one.
output transformer
I saw interesting post on audioasylum http://www.audioasylum.com/scripts/t.pl?f=tweaks&m=99013
Which transformer I could use for mods?
Any one could recommend specific part number or model?
Vlad
I saw interesting post on audioasylum http://www.audioasylum.com/scripts/t.pl?f=tweaks&m=99013
Which transformer I could use for mods?
Any one could recommend specific part number or model?
Vlad
Great Musical Selection
Thanks for the suggestions. I like Chick Corea too. I have almost all the return to forever LP. I will try these SACD. Thanks again.
Thanks for the suggestions. I like Chick Corea too. I have almost all the return to forever LP. I will try these SACD. Thanks again.
Mods Update Question
Hello,
In addition to the capacitor upgrade, did you make any other changes to the smps? Rectifier diodes for example.
I see that you used copper foil to cover different parts. Did you ground the foil?
The extensive damping looks neat. I plan to do the same but to the bottom on the outside and then bolt the chassis to a platform of some thick, heavy material. I can't decide on an mdf/sorbothane/mdf sandwich , or go for real mass with a piece of damped granite or marble. I would welcome suggestions!
One more question. I see that you removed everything from the chassis to do your damping. Did you undo the flex foil connections? If you did, can you explain how to take them off, short of unsoldering everything? I don't have any experience with this type of wiring harness.
Thanks for keeping us up to date.
Nic.
Hello,
In addition to the capacitor upgrade, did you make any other changes to the smps? Rectifier diodes for example.
I see that you used copper foil to cover different parts. Did you ground the foil?
The extensive damping looks neat. I plan to do the same but to the bottom on the outside and then bolt the chassis to a platform of some thick, heavy material. I can't decide on an mdf/sorbothane/mdf sandwich , or go for real mass with a piece of damped granite or marble. I would welcome suggestions!
One more question. I see that you removed everything from the chassis to do your damping. Did you undo the flex foil connections? If you did, can you explain how to take them off, short of unsoldering everything? I don't have any experience with this type of wiring harness.
Thanks for keeping us up to date.
Nic.
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