Ok, I think I get the hang of Mosfet selection now...
This new mosfet from Toshiba (TPH1R306PL1,LQ) seems to be the best technically, and also SOP-8 format what will work with Prasi's SMT PCB. 74 week lead time though 🙄
In terms of through hole - IPP029N06N. I question myself if it's worth waiting for 74weeks for the above though... Is 1 mOhms vs 2.7 mOhms RDson really going to make the difference?
Now, higher Vgs(th). Prasis states 2V min, but would 4v be better?
This new mosfet from Toshiba (TPH1R306PL1,LQ) seems to be the best technically, and also SOP-8 format what will work with Prasi's SMT PCB. 74 week lead time though 🙄
In terms of through hole - IPP029N06N. I question myself if it's worth waiting for 74weeks for the above though... Is 1 mOhms vs 2.7 mOhms RDson really going to make the difference?
Now, higher Vgs(th). Prasis states 2V min, but would 4v be better?
There should be no advantage between 2 or 4 V Vgs MOSFETs. However, one detail from the datasheet gives a hint:
„A gate threshold voltage lower than 2V is not recommended since too much time is needed to discharge the gate below the threshold and halt current conduction during a hot plug or input short event.“
Seems that In case of MOSFET with high gate charge, it would be better to use one with higher Vgs threshold voltage.
„A gate threshold voltage lower than 2V is not recommended since too much time is needed to discharge the gate below the threshold and halt current conduction during a hot plug or input short event.“
Seems that In case of MOSFET with high gate charge, it would be better to use one with higher Vgs threshold voltage.
Apologies, noob here. Can I use two rectifier pcb's with a dual secondary transformer? One for each channel?
Thanks
Thanks
No reasons why not. There must be two separate secondary windings (4 wires), not two with common center tap (3 wires). That's all.
Third that. Please let me know if boards are, or become available. Thank you!
Cheers!
Stephen
Hi Prasi,
Is it still possible to buy four of the new modified LT4320 TH ?
https://www.diyaudio.com/community/threads/lt4320-based-active-rectifier.336572/post-6554983
I need to use the TH version but my older PCB will only take 8DIP and since there's no stop of 8DIP, your new TH board also accepts the 12MSOP which is still in stock.
Please let me know
Thanks
Do
Is it still possible to buy four of the new modified LT4320 TH ?
https://www.diyaudio.com/community/threads/lt4320-based-active-rectifier.336572/post-6554983
I need to use the TH version but my older PCB will only take 8DIP and since there's no stop of 8DIP, your new TH board also accepts the 12MSOP which is still in stock.
Please let me know
Thanks
Do
Hi. this looks fantastic! I am late to the party. Is is possible to purchase a PCB for this that I can populate on my own? cheers, Mike
Can I ask the community for some help, please?
I need to make a PSU for my amp, which will be a simple rectifier + capacitors option. No snubbers.
Amp will run on a 500 VA , 2x 35 AC secondary transformer. I plan to use two boards with 40000 uF or more, one board for each channel.
For that:
1. I will short resistors on the underside.
2. Populate bleeder resistors RB1 ,RB' with 5.6 k / 3 watt
3. Install rectifiers B1 B2
4. Install led and a current limiting resistor, probably 10k, 1-watt minimum?
5. Install C1-C4 caps
Have I missed anything?
And please advise how to connect two boards to the transformer secondary, if possible 🙂
Thanks
I need to make a PSU for my amp, which will be a simple rectifier + capacitors option. No snubbers.
Amp will run on a 500 VA , 2x 35 AC secondary transformer. I plan to use two boards with 40000 uF or more, one board for each channel.
For that:
1. I will short resistors on the underside.
2. Populate bleeder resistors RB1 ,RB' with 5.6 k / 3 watt
3. Install rectifiers B1 B2
4. Install led and a current limiting resistor, probably 10k, 1-watt minimum?
5. Install C1-C4 caps
Have I missed anything?
And please advise how to connect two boards to the transformer secondary, if possible 🙂
Thanks
Hi voxxonline,
Are you planning to use two PSU boards with a single transformer? If yes, you will need a transformer with quad secondary, two for each PSU board. Know that if you plan on using a single transformer with only dual secondary on two independent PSU, it will create a huge hum and you will not be able to get rid of this.
As for the led on the PSU, I suggest you just find an online resistor/led calculator, very simple input data and it will tell you which value would work. From there you can decide if you want dimmer or brighter led.
It would also be good to know if you plan on using these PSUs on a class A, AB, etc.., amplifier. Shorting the filter resistor on the underside of the PCB, I’m guessing those are part of the CRC filter. On a class AB, I personally wouldn’t use them, but on a class A amplifier which usually does not have best PSRR, they would need to be there.
I don’t know if this is any help to you.
Have fun with the build!
Do
Are you planning to use two PSU boards with a single transformer? If yes, you will need a transformer with quad secondary, two for each PSU board. Know that if you plan on using a single transformer with only dual secondary on two independent PSU, it will create a huge hum and you will not be able to get rid of this.
As for the led on the PSU, I suggest you just find an online resistor/led calculator, very simple input data and it will tell you which value would work. From there you can decide if you want dimmer or brighter led.
It would also be good to know if you plan on using these PSUs on a class A, AB, etc.., amplifier. Shorting the filter resistor on the underside of the PCB, I’m guessing those are part of the CRC filter. On a class AB, I personally wouldn’t use them, but on a class A amplifier which usually does not have best PSRR, they would need to be there.
I don’t know if this is any help to you.
Have fun with the build!
Do
Thanks. I am reading about power supplies in the background, just want to be sure I am doing right things.
It is Class AB with good PSRR hence need for a rectifier and caps only.
I have decided to use only one board, for a reason you mentioned (thanks for your help by the way).
I am being cautious due to the fact I have many moving parts in my puzzle as I build both pre and power amps at the same time so am digesting a lit of information at the moment.
By the way what r8 and r9 are for?
Thanks a million again.
It is Class AB with good PSRR hence need for a rectifier and caps only.
I have decided to use only one board, for a reason you mentioned (thanks for your help by the way).
I am being cautious due to the fact I have many moving parts in my puzzle as I build both pre and power amps at the same time so am digesting a lit of information at the moment.
By the way what r8 and r9 are for?
Thanks a million again.
of crc power supply.
Is it a snubber? I just want to figure out what should I populate for a simple rectifier and capacitor bank.