500W PA amplifier with Limiter

[HighTec]

engel dela pena,

nasty dust over those fans.

 

[andrewlebon]

hi engel dela pena
greetings congrats for completing amplifier
did you use nsl 32
thanking you
andrew lebon

 

[apexaudio]

I must say once again that B500, and H900 can work without NSL32, you just have no limiter, and instead led diode integrated in NSL32 you can use regular led diode for clip indicator.
Regards

 

[engel dela pena]

hi engel dela pena
greetings congrats for completing amplifier
did you use nsl 32
thanking you
andrew lebon

no nsl32
ldr+led only

 

[engel dela pena]

engel dela pena,

nasty dust over those fans.

no problemo amigo,
wait for her revival he he he
that was my old amp quasi n fet psu specs is very good for b500
i replaced with b500 module

 

[apexaudio]

engel,
what kind of music you listen?

 

[eesbiboi]

engel,
sir what components are hard to find in our country???...your from what city???...

 

[Gitsa]

In Russia you can get an approximate analog aor124

 

[apexaudio]

In Russia you can get an approximate analog aor124

Is this opto ldr? What is pin layout?

 

[engel dela pena]

engel,
what kind of music you listen?

rock soul & jazz
good sonics

 

[engel dela pena]

engel,
sir what components are hard to find in our country???...your from what city???...

b500 is friendly here unlike the h900,
no IR2117
nsl32 also,
i'm from malolos,
but i got most af the parts also from manila

 

[engel dela pena]

Bulb have positive temperature coefficient (PTC). When bulb is cold it have small resistance, when current rising bulb get hot and resistance is R=U2/P. U=220v, P=100w and R=484R when bulb bright, that resistance will drop voltage on primary and protect amplifier if something is wrong.
Resistance of 150R will drop voltage on primary if current rising. Voltage on primary will be U=220v-150RxI(A), voltage drop will protect amplifier is something was wrong also like bulb.

bulb is very bright during first power
after the in rush current
bulb start to dimmed

 

[apexaudio]

bulb is very bright during first power
after the in rush current
bulb start to dimmed

When during first power, caps are charging and current is high.

 

[Gitsa]

Here are the details in Atach

 

[apexaudio]

Here are the details in Atach

Thanks, I like case, it is more robust than NSL32.

 

[Gitsa]

Not had to deal with NSL32, I can not say anything, but people did on aor124, it is in kliplimiter in amplifiers, working chetko.Ya now finish your payment b500 and check!

 

[Gitsa]

Here's a similar example!

 

[apexaudio]

Here's a similar example!

Look like AOR124 is perfect for B500, if pins layout is right, but that will be smal problem.
Regards

 

[apexaudio]

rock soul & jazz
good sonics

Like me,
Cheers

 

[apexaudio]

Apex b50

If you like sound of B500, but is to much powerfull for Hi-Fi, consider about this 50W amp.
Regards