Ultra Simple Class D

[sweetperfume]

it woun't have clarity as tl074/84

your saying about clarity...its way beyond dude....i get a huge short accros the series....when i connect fets dont know why...can u plz help me out

 

[stewin]

pls check your pcb properly maybe you have short or you have missed soldering.

 

[sweetperfume]

everything is ok the waveform on high is small in size than the low side.....comparable 3 times small i guess

 

[JinGeo]

it woun't have clarity as tl074/84

Nonsense, it wouldnt work at all.
Look at the slew rates:
lm324: 0.4V/us
tl074: 15V/us
Lm wouldnt oscilate.

sweetperfume
If you are using lm's? Thats probably the reason your fets are smoking.

 

[sweetperfume]

Nonsense, it wouldnt work at all.
Look at the slew rates:
lm324: 0.4V/us
tl074: 15V/us
Lm wouldnt oscilate.

sweetperfume
If you are using lm's? Thats probably the reason your fets are smoking.

gr8 thanks buddy.....but are u definite with ur opinion....and what would be the other reason if this aint be the prob

 

[stewin]

hi guys. the hi power version in bridge mode. i will upload artwork later

 

[xeclipse]

hi guys. the hi power version in bridge mode. i will upload artwork later

Stewin, you sure love what you do! Great work!

 

[stewin]

Stewin, you sure love what you do! Great work!

i thank GOD for his help . long time welcome back.

 

[stewin]

hi all i made bridged version and tested it but . when i pushed it hard with a 6ohm load that is a 18inch woofer the amp failed after 2 minitues. .i think my tracks for pcb were small the ones feeding the output fets. also

>>> btw the circled components were heating above normal.

here are the photos

 

[CPX]

Use resistive load for testing...don't you care about your speakers and your ears?.
Also any amplifier must survive continuous rms power into resistive load to be reliable with music.

 

[stewin]

Use resistive load for testing...don't you care about your speakers and your ears?.
Also any amplifier must survive continuous rms power into resistive load to be reliable with music.

resistive loads like ? resistors in parallel to match impedance desired?

 

[sweetperfume]

Cpx, Resistive load means a speaker...and non-resistive means a resistor load.. .

 

[CPX]

sweetperfume:
No,the opposite is correct.
A speaker is a non resistive load, in fact it is a nonliniar inductive/capacitive/resistive system depending on its configuration(single or multiple in cabinet and with or without filters).

stewin:
Power resistors with their resistance smaller than rated impedance, example: for 4 ohm impedance use 3 or even better 2.5 ohm low inductance resistors or resistor network

 

[mgee]

how can i simulate class d with ni circuit design suite multisim

 

[Tekko]

You simply draw the schematgic, assuming multisim has models for the components used, which as far as i know it should.

 

[mgee]

ni multisim doesnt hav models for ir2110 or irs2092. i hav seen several class d schematics with these two componets but i dont knw which cad was used. can anyone cum to my rescue please.

 

[Tekko]

There are models available of the IR2110 for Linear Tech LTspice switchercad.

 

[Macleod]

The schematic post 246 showing bridged class D may experience problem. Both halves may oscillate at different frequencies and some intermodulation product may be heard.

Bridge class D amp should be done using the same modulator or synchronized modulator.

 

[stewin]

hi all just found this schema by detex audio . it seems simple . what makes it 100watts and not 200 watts?

 

[Hlaford]

Supply voltage? If I was not this lazy I'd make a LTspice simulation of this circuit to see what it is capable of, but on a first look, the supply voltage could be ramped up for some more power.