hi gang!
i'm new here so be nice!
i'm trying to design a good PS for TDA1541A
i'm a bit unsure of the use of series regs when audio
currents are involved. is there any way around the
standard LM317(337) -> TL431 combo?
how about a double shunt reg TL431->TL431?
i attach a pic of what i have in mind.
feel free to laugh at it 😀
(sorry for the quality...)
cheers!
i'm new here so be nice!
i'm trying to design a good PS for TDA1541A
i'm a bit unsure of the use of series regs when audio
currents are involved. is there any way around the
standard LM317(337) -> TL431 combo?
how about a double shunt reg TL431->TL431?
i attach a pic of what i have in mind.
feel free to laugh at it 😀
(sorry for the quality...)
cheers!
Attachments
TL431 operating point
i forgot to ask: is there any optimal operating current for TL431 or anything 1-100mA woul do equally well? datasheets quote data at 10mA...
cheers!
i forgot to ask: is there any optimal operating current for TL431 or anything 1-100mA woul do equally well? datasheets quote data at 10mA...
cheers!
Hi,
Have you thought about using a capacitance multiplier ?
Could you post a higher quality scan ?
Cheers,
Jon
Have you thought about using a capacitance multiplier ?
Could you post a higher quality scan ?
Cheers,
Jon
better res. schematics
i attach a better resolution schematics of what i have in mind.
any comments/criticism?
John, i wanted to avoid active elements in series with
the supply rail. perhaps it's not a good idea when digital
currents are involved? i'm new to digital, hence seeking
advice 🙂
i rather thought of putting a transistor on top of tl431.
cheers!
i attach a better resolution schematics of what i have in mind.
any comments/criticism?
John, i wanted to avoid active elements in series with
the supply rail. perhaps it's not a good idea when digital
currents are involved? i'm new to digital, hence seeking
advice 🙂
i rather thought of putting a transistor on top of tl431.
cheers!
Attachments
Hi,
Why do you want to avoid active elements in the supply line, just curious ? In which case you wouldn't consider feeding the shunts with a constant current source ?
Cheers,
Jon
Why do you want to avoid active elements in the supply line, just curious ? In which case you wouldn't consider feeding the shunts with a constant current source ?
Cheers,
Jon
hi!
the reason is very simple -- i don't want the audio signal to go through the active elements. in tube world, where i come from, it's a well established fact that shunt tube reg's sound better than series tube reg's. current source behind a shunt is a bit different story and i will try it also.
but my question remains open: since shunts (discrete or integrated) are acknowledged as being superior to series regs, why not pre-regulating with a shunt too and getting rid of a series reg at all? perhaps it simply doesn't matter as a good shunt screens the regs behind? any ideas?
cheers!
the reason is very simple -- i don't want the audio signal to go through the active elements. in tube world, where i come from, it's a well established fact that shunt tube reg's sound better than series tube reg's. current source behind a shunt is a bit different story and i will try it also.
but my question remains open: since shunts (discrete or integrated) are acknowledged as being superior to series regs, why not pre-regulating with a shunt too and getting rid of a series reg at all? perhaps it simply doesn't matter as a good shunt screens the regs behind? any ideas?
cheers!
Hi,
Please forgive my ignorance here (I'm learning) but a shunt regulator draws a constant current from the supply - what the load doesn't draw is dumped into the ground therefore the pre-shunt regulator doesn't actually have to 'regulate' anything as it simply supplies a constant DC voltage to the shunt regulator ? So, you want to feed the shunt regulator with something that supplies a clean DC and filters out AC noise ? You could use another (pre) shunt regulator but that will simply dump more current into the ground plus it also has a relatively wide bandwidth so will also couple noise into the second regulator ?
Cheers,
Jon
Please forgive my ignorance here (I'm learning) but a shunt regulator draws a constant current from the supply - what the load doesn't draw is dumped into the ground therefore the pre-shunt regulator doesn't actually have to 'regulate' anything as it simply supplies a constant DC voltage to the shunt regulator ? So, you want to feed the shunt regulator with something that supplies a clean DC and filters out AC noise ? You could use another (pre) shunt regulator but that will simply dump more current into the ground plus it also has a relatively wide bandwidth so will also couple noise into the second regulator ?
Cheers,
Jon
387cbrb said:
As they are in parallel with each other there would have to be a current source or a dropping resistor between them so that they are at different voltages.
Hi 387cbrb,
I replaced series R in normal TL431 circuit by LM317 in CCS mode. I observed a bit better sound in my non-OS TDA1541A and AD1865 DAC. I think about power J-Fet CCS too. I'll try it soon. Hope this benefit to you too. Any comment are welcome.
Regards,
Art.
I replaced series R in normal TL431 circuit by LM317 in CCS mode. I observed a bit better sound in my non-OS TDA1541A and AD1865 DAC. I think about power J-Fet CCS too. I'll try it soon. Hope this benefit to you too. Any comment are welcome.
Regards,
Art.
Greetings from aust.
hi sorry to change the subject but is it ok if you send me a pdf copy of that marantz cd46 manual / schematic, cheers.
my email is
removed by moderators
kind regards dom
hi sorry to change the subject but is it ok if you send me a pdf copy of that marantz cd46 manual / schematic, cheers.
my email is
removed by moderators
kind regards dom
Re: Greetings from aust.
You should use the form above for posting email addresses to public forums unless you like lots of spam.
Also in terms of your off topic post, why did you post it to this thread?
You should have started a new one.. Ask a mod to remove your email address quickly and they can also start a new thread for your request.
isdom said:
You should use the form above for posting email addresses to public forums unless you like lots of spam.
Also in terms of your off topic post, why did you post it to this thread?
You should have started a new one.. Ask a mod to remove your email address quickly and they can also start a new thread for your request.
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