UCD 25 watts to 1200 watts using 2 mosfets

[Dimonis]

Can't find nor 17 , nor 28 mix , the only blue is "-M125 Material: This 125 permeability moly-permalloy powder material will have the lowest core losses for frequencies of 200 kHz or less. Similar to the -70 Material, physically small sizes will be most competitively priced."

 

[Dimonis]

17 Mix (Blue/Yellow).

Also the red i have is red/gray in fact....there are lots of variations..

Black/red in fact a good material Mix № 14

And a lots of variations ..... make be fake.

 

[irvynejay]

here is the link of the core we use
HF-157060-2 Arnold Powder Core

 

[nigelwright7557]

here is the like of the core we use
HF-157060-2 Arnold Powder Core

Expensive !

I paid around 90p for the Amidon t106-2.

 

[Dimonis]

Expensive !

I paid around 90p for the Amidon t106-2.

Here's your T106-2 T106-2 Micrometals Iron Powder Toroid

And a good guide from Arnold/micrometals - http://www.arnoldmagnetics.com/WorkArea/DownloadAsset.aspx?id=4441

 

[CPX]

Thanks Dimonis for aditional researching.

 

[andrewlebon]

bridging ucd amplifier

Hi Dimonis
greetings thanks for schematic its time i made it Q4 no number only
OTA114ES any thing i can use for it thats only part i dont have and confused over IC 74AC OOSC so many 7400 available do i have to use ONLY 74AC00SC
hex inverter ic just need help on these parts and i am ready to try it its my learning project
warm regards
andrew lebon

 

[Dimonis]

Not OTA , it's DTA114 ( Digital transistors with built-in resistors) , can place any p-n-p with external resistors.
74AC00 can be replaced by 74HC00 , 74AC... are just speedy little

 

[Dimonis]

You don't need to make the part of schematics with DTA114 - it's just a clip indicator / and limitter control signal.

 

[sameer x1]

UCD AMP WITH DC PROTECTION

Hi gyes
I m making this amplifier.please suggest me which mosfet is good for this amplifier





THANKING YOU
SAMEER X1

 

[andrewlebon]

ucd 1200

Hi Sameerx1
nice pcb good to have dc protector pcb has holes for IRF250 and
IRFB4227PBF
WARM REGARDS
andrew lebon

 

[akraj]

JBL Class D amp for Subwoofer!

Dear All:

I am planning to devlop a PCB of the attached Schematic, this is from JBL sub.

I know there are more simpler schematic out there but just thinking that this is well tested and all soft of protections are there.

Any comments not to do this? Thanks in advance to all.

https://www.cx.com/mycx/share/PYYgQ0JcEeGSgRICOBql1A/jbl_s120pii_[ET].pdf

Thanks
Raj

 

[Dzony988]

For Andrewlebon

you can use any two amps for bridge with this! Amps must be the same as much as possible.

I use this schematic for this ucd amp. On out+ goes in of first amp and on that amp you conect + of speaker. On out- goes in of second amp and on that amp you conect - of speaker.

And that is all about full bridge. With this amplifeir this is very good schematic because in inputs of both amps you have op amps who is low impedance soruce of signal, that means you can use 4.7nF cap from input to gnd and you have low noise and full audio range. Before input (in1) on bridge adapter, I recomanded you 4.7K lin pot for volume!

All is power with +-15V

 

[Dzony988]

If you build classic amp with two chanel, you can use my "Volume panel".

With this panel you have volume control for both chanel and easy can swich all amp in full bridge mod with bridge swich. When bridge is on, Led is turned on..

All is powered with +-15V and when is whole amp in bridge mod, then you use Ch2 pot for volume control

6 pins double swich that I use for this. It's no metter side of conection, only is metter conection of swich PARALEL to pins on pcb (like the swich is on top of pcb, if you understand me).

Now you'll know when is bridge mod turned on because led will turned on too.

 

[norazmi]

Dzony absolutely right, i already told him about it, use 2 amp pcb to make it bridge. Provided u need big PSU and enough current to get full power. +/- 50 vdc is enough in full bridge. Btw Dzony already posted bridge circuit and pcb, nice work.

 

[gerry_morales]

hi my fren nirazmi,
hers is a nice bridge design

 

[norazmi]

Lol

Your pcb worked? How does it sound? tell me about noise also.. if u have time

 

[Dzony988]

Full bridge is good for subwoofers in class D, because half bridge dont have strong "bum" bass . Only problem with full bridge is very high current and bus punping. Lots of capacitance needed in PSU to avoide bus pumping in rails and if you drive 4ohms speaker in full bridge, both of amps sees half of whole impedance = 2 ohms per amp...

What do you think, can IRFP250 run in full bridge on +-70V and 4ohms load?

I drive IRFP240 on +-50V and 4 ohms full bridge and everuthing is ok but mt transformer dont produce big current and before cliping in subwoofers I can hear big dostrosion and mechanical sound

 

[norazmi]

IRFP250N yes why not, if you dont mind about thd. u need to setup proper gate resistor for it or u will need big heatsink

i did before full bridge with irf540N with 2 board and drive 6 15 inch speaker hard at carnival college start run 8:00 pm till 2:00 am, and its survive hehe voltage = +/- 48.9 vdc, 1 uf caps at each amp and 22 uh T106-2 no problem.

 

[norazmi]

Dzony with original pcb mr ejtagle i dont face any bass pumping even in full bridge. Filter ur power supply with good filtering, 1uf 250 vdc at +vcc to gnd, -vee to gnd and +vcc to -vee. Mine use 6 1 uf 250vdc.