Class D Amp with LM566, LM393 and 2XIRF530

[PetruV]

What driller motor should i get,more specificaly what apliance has the kind of motor that you would recomend,that one is from a printer

 

[norazmi]

more work petruv if u cant get exactly center point to drill, you need to make center point with analog device like classic hand drill just to make center point then start drilling with your motor.

 

[PetruV]

more work petruv if u cant get exactly center point to drill, you need to make center point with analog device like classic hand drill just to make center point then start drilling with your motor.

i centered it better

 

[PetruV]

What matterial do the small caps have to be and what voltage do the electrolitics have to be considering it will be used at 75v

 

[norazmi]

which small cap? For 75vdc, better use 100v cap. For 100n or 0.1uf use non polar caps

 

[Tekko]

For the small caps, use ones made for snubber/decoupling.

 

[PetruV]

ceramic or film or poliester,

Thanks,but for 90v will 100v caps still be ok

 

[Tekko]

Too small safety margin, for 90V, use 120-150V rated caps.

 

[PetruV]

ok
but one thing still remains
ceramic or film or poliester for smaller non electolitic caps
Thanks

 

[Tekko]

I'd use X7R ones made for decoupling purposes in 1210 smd package, same ones as chocoholic uses in his system D class d amp.

But i think also WIMA MKT/FKP would work as well.

 

[PetruV]

They are ceramic caps so i can safely use thes round orange ones i have a lot of,i heard they are also used for decoupling so it will work

BTW wima caps are expensive,and probably imposible to find in shops,so im using my ceramics afte you give me the ok

 

[apexaudio]

D200 on test
D200 JUST TEST - YouTube

 

[norazmi]

what mosfet do you test apex? gate? and rail voltage?

 

[apexaudio]

what mosfet do you test apex? gate? and rail voltage?

Not my work, this D200 made by Suryadi Achmad work at +/-45V with 10N60 mosfets.

 

[norazmi]

oh okay, ill make it stereo for test

 

[joexswj]

Or you can place an order with itead studio and get ten boards for 28 us dollars shipped, though this requires having access to the PCB gerber files, which i'd guess is a well regarded secret locked away at apex's PC. Assuming Apex dident just draw his pcb's with a picture editing program such as photoshop, ms paint or similar.

and no norazmi, you cannot use a LS series ic, the circuit assumes and requires a HC series ic which is a mosfet based ic wheres the LS series is bipolar transistor based, the LS series is also much slower.

thanks Tekko....

 

[Deleted member 148505]

Anyone tested the over current protect? Will the over current in mosfet be reflected in output current sense fast enough? There's no delay after the trigger too.

 

[PetruV]

Anyone tested the over current protect? Will the over current in mosfet be reflected in output current sense fast enough? There's no delay after the trigger too.

I was about to ask that

 

[norazmi]

it must have a delay after protection triger, i`ve done it before with 555 timer, 1N5401 and PC817.

 

[Deleted member 148505]

Hi Azmi,

I've traced the circuit for the protection. It uses 2 of the NAND gates(pins 1 to 6) for shutdown control, the input for the pins 1 and 2 of 74HC00 (encircled in the attached pic) is normally "low", when there's a voltage across the current sensing resistor, pins 1 and 2 will go "high", resulting pin 6 to output high then triggers the SD pin of IR2110.

But there's no delay for the trigger, the 47uf connected in pin 5 is only for startup delay.
I'm afraid the protection will loop fast (assuming current sensing in speaker out works) and might lead to mosfet destruction.