As far as i know, all Detex audio class d are prefilter feedback Delta Sigma or hysteresis based.
Post filter feedback is the one and only way to go in self oscillating class d.
In clocked class d, ur best off with open loop fullbridge as phase shift makes AF feedback more or less useless above around 1kHz anyways.
Post filter feedback is the one and only way to go in self oscillating class d.
In clocked class d, ur best off with open loop fullbridge as phase shift makes AF feedback more or less useless above around 1kHz anyways.
Thanks,can you recommend something else for 50v rails which is simpler or same as detex audio amp in complexity,i guess self oscilating
UcD180HG from Hypex.
There are also the Abletec modules at profusionplc.com that comes with two channels and a integrated power supply. Though i almost thinks my diy UcD actually sounds better than the Abletec module, which means the Hypex UcD will also sound better.
There are also the Abletec modules at profusionplc.com that comes with two channels and a integrated power supply. Though i almost thinks my diy UcD actually sounds better than the Abletec module, which means the Hypex UcD will also sound better.
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Bought kits are a no no.too expensive,too much for shipping and impossible to find but UcD180HG looks like is liked by a lot of people,but looks hard to assemble
Im looking for a project that is built many times and it is trusted,not just calculated to fit parameters !
Im looking for a project that is built many times and it is trusted,not just calculated to fit parameters !
Diying a module aint gonna be any cheaper! It cost me about as much as a UcD180ST to assamble one channel of my latest DIY UcD class d.
Hi!
Recently I have found a great document from TI on PWM and I had thought about this thread.
It has renewed my interest in playing with Class D designs again and it can be found here,
http://www.ti.com/lit/ug/slau508/slau508.pdf
Another neat little component I have also found is the TimerBlox chips from LT.
These are complete PWM systems on one tiny little chip and run as high as 1Mhz!
I have a few of the LTC6992-2's and I will be giving them a try sometime in the future as well, Here is the data sheet,
http://cds.linear.com/docs/en/datasheet/69921234fc.pdf
Just add your favorite drivers and FET's !!!
jer 🙂
Recently I have found a great document from TI on PWM and I had thought about this thread.
It has renewed my interest in playing with Class D designs again and it can be found here,
http://www.ti.com/lit/ug/slau508/slau508.pdf
Another neat little component I have also found is the TimerBlox chips from LT.
These are complete PWM systems on one tiny little chip and run as high as 1Mhz!
I have a few of the LTC6992-2's and I will be giving them a try sometime in the future as well, Here is the data sheet,
http://cds.linear.com/docs/en/datasheet/69921234fc.pdf
Just add your favorite drivers and FET's !!!
jer 🙂
Price is 129 euro and building one from scrap parts wont cost much as i only need chips and mosfets,pcb is free and calculated cost for the detex one is around 5 euro.
Thanks tekko,but your argument is invalid,more help on finding a good project will be needed 😀
Thanks tekko,but your argument is invalid,more help on finding a good project will be needed 😀
Using junk parts is asking for an amp that will not work.
In order to build a class d amp you need nice fresh new shiny components.
In order to build a class d amp you need nice fresh new shiny components.
D
Deleted member 148505
@PetruV
Build the one made by ejtagle first, many diyers who made it are satisfied with its sound.
If you don't have experience in building class d/ amps, well then DIY might turn more expensive, because of failed amps specially if you use junk parts. Instead of buying assembled working modules from the start.
Build the one made by ejtagle first, many diyers who made it are satisfied with its sound.
If you don't have experience in building class d/ amps, well then DIY might turn more expensive, because of failed amps specially if you use junk parts. Instead of buying assembled working modules from the start.
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by junk parts i mean tested parts,to make sure they are not broken.every transisor and diode is tested
What the user above posted is kinda the schematic type i want,but i want to use mosfets and more modern opamps
What the user above posted is kinda the schematic type i want,but i want to use mosfets and more modern opamps
This schematic i posted is UcD ie post filter feedback self oscillating, V3 is the audio input.
Power you can scale to your liking by choosing rail voltages and mosfets accordingly.
My current setup has one channel running at just shy of 500kHz and the other channel around 600kHz, rail voltages are currently 2x22VDC and i'm using IRF540 mosfets salvaged from a scapped project, the gate drive is a IR2010 and the comparator a MAX913.
Power you can scale to your liking by choosing rail voltages and mosfets accordingly.
My current setup has one channel running at just shy of 500kHz and the other channel around 600kHz, rail voltages are currently 2x22VDC and i'm using IRF540 mosfets salvaged from a scapped project, the gate drive is a IR2010 and the comparator a MAX913.
nice! but i am afraid im not going to build this without a pcb,and im also scared i cant find those awkard diodes,not even in shops,but i will give it a try once i have the pcb!
I only have a preliminary layout which is already posted in another thread, but as i have some EMI issues to deal with i cant recommend it, quite frankly i shouldent have posted this project what so ever until i had the EMC stuff fixed, tested, passed and behind me.
I also need to drop the noise floor quite a bit assuming it is even possible, im gonna assume -60dB is a level noticable throughout a livingroom considering thats where you'll find 0.1% or was it 1% THD.
I also need to drop the noise floor quite a bit assuming it is even possible, im gonna assume -60dB is a level noticable throughout a livingroom considering thats where you'll find 0.1% or was it 1% THD.
I dont know if its noticeable,most probably no,since my computer aleardy has a 70db s/n ratio and it dosent bother me too much trough my current tda2003 amp,But we will see