500W PA amplifier with Limiter

[wattaniya]

sound is excellent.

 

[44250]

lookin´ good!

hi apex sir,
i did what u said in post 2016, now no hum.

my camera focusing is little problem, that's why the images are smudge.
i used these tools to make the casing, taper,taper hande,mini circular saw,drill machine, jigsaw mashine,c clamp.
thanks.

He he now the pictures look very artistic! It looks great,specially when a man look´s what simple tools have you used to do it! What is a power of a transformer and why so small number of words in a comment of sound?

Am i wrong or you did a H900 too?

 

[wattaniya]

He he now the pictures look very artistic! It looks great,specially when a man look´s what simple tools have you used to do it! What is a power of a transformer and why so small number of words in a comment of sound?

Am i wrong or you did a H900 too?

hi 44250,
the transformer power is 1100watts.

b500 is a power full amp, but already made the h900 after b500 ,so h900 is more power than b500, and i already made cheshta amp 1500watts.

thats why i answered in short.

 

[44250]

Thank you for your answer!

 

[wattaniya]

hi apex sir,
is this copper routing is safety?
1mm space i give for this pcb.

 

[wattaniya]

Thank you for your answer!

did u see this page.
http://www.diyaudio.com/forums/solid-state/203970-cheshtap-power-amp-4.html

 

[fayza]

2N5401 is for VI cut-out protect.
Feedback circuit is important NE5532 can be replaced with another OP amp.

can we use TL 071, C4558?
regards

 

[fayza]

Step driver is separate circuit and can be use with any classAB amp to get classH amp.
B500 and H900 don't need step driver, B500 is classAB amp and H900 is classH amp with integrited step driver.
Regards

Mr. Mile...
on b500 can I change MJE 15032 / 33 with cros reference transistors? hard to find these transistors in my place (sory my english)

regards

 

[wattaniya]

hi apex sir,
can u check post no 2025.

 

[wattaniya]

hi apex sir,
any replacement for bd681, hard to find .

 

[iiee3602]

hi apex sir,
any replacement for bd681, hard to find .

Hi sir,

Try MJE340

 

[andrewlebon]

BD681 is a darlington transistor

 

[wattaniya]

how about tip122?

 

[apexaudio]

hi apex sir,
any replacement for bd681, hard to find .

Use any NPN TO126 Darlington like MJE801...

 

[wattaniya]

hi apex sir,
can u check post no 2025.
thanks sir for the reply.

 

[apexaudio]

hi apex sir,
is this copper routing is safety?
1mm space i give for this pcb.

It's safe, but your copper isn't connected to gnd

 

[wattaniya]

It's safe, but your copper isn't connected to gnd

thanks sir,
not connected to gnd.

 

[masood]

dear apexaudio,
plz. publish 200watt amplifier by using mos 2sk1058 and 2sj162. thanks with regards masood

 

[andrewlebon]

hi

Hi Nazirdigi
greetings did you manage to test your tef b500 heres the pcb
which schematic are you following
warm regards
andrew lebon

 

[wattaniya]

Hi Nazirdigi
greetings did you manage to test your tef b500 heres the pcb
which schematic are you following
warm regards
andrew lebon

hi Andrew lebon,
sorry for late assembling b500tef, I'm following apex triple darling-ton schematic.
i am busy these days for my shop arrangements. it will take one week to get this work.