500W PA amplifier with Limiter

[kanon]

car amp.

hi apex
some questions.?
1. I can use this amp for car.
2. Can be used at 2 ohms.
3. How much power need to give a good performance

It looks pretty good, and a look at a HIFONICS see something similar
90v per rail..

 

[apexaudio]

dear sir apexaudio,

You said that to build B250 I can use B500 PCB. So, what kind of modification to the PCB and component? Some schematic or PCB layout could help...

Thank you

B500 is based on B250 with add one more pair of outputs and limiter circuit, just use schematic and pcb of B500 with 3 pair outputs and +/-65V rail you get B250.
Regards

 

[apexaudio]

hi apex
some questions.?
1. I can use this amp for car.
2. Can be used at 2 ohms.
3. How much power need to give a good performance

It looks pretty good, and a look at a HIFONICS see something similar
90v per rail..

You need 500W, 12V to +/-55V DC/DC inverter and you can use B500 for car with 2 ohms load.
Regards

 

[triast]

B500 is based on B250 with add one more pair of outputs and limiter circuit, just use schematic and pcb of B500 with 3 pair outputs and +/-65V rail you get B250.
Regards

Dear Sir Apexaudio,

To get B250, I will remove (left it blank) a pair of 5200/1943 and two resistors (0R33 5W). Please see attachment. Am I right?

Please Guide me.

Kind Regards

 

[Djnits]

Add LED in series with LED integrited in NSL32, and you have clip/limit indication.
Regards

hello sir apex, if i remove the NSL32 and i put the LED and 47k it seems like my attachment?....and also i use the treple darlington transistor it seems like my attachment also...pls guide me thanks more power

regads

 

[apexaudio]

Dear Sir Apexaudio,

To get B250, I will remove (left it blank) a pair of 5200/1943 and two resistors (0R33 5W). Please see attachment. Am I right?

Please Guide me.

Kind Regards

Yes, and you can remove NSL32 if you don't want use limiter.
Regards

 

[apexaudio]

hello sir apex, if i remove the NSL32 and i put the LED and 47k it seems like my attachment?....and also i use the treple darlington transistor it seems like my attachment also...pls guide me thanks more power

regads

Use 150R for predrivers and 5R6/2W for drivers transistors.
Regards

 

[engel dela pena]

apex,
will b500 improve by implementing triple darlington?

 

[Djnits]

Use 150R for pre drivers and 5R6/2W for drivers transistors.
Regards

i used 47R for predriver and 4R7/2W for driver transistor it's OK of that value? or which a good value for the triple darlinton driver stage......base on my attachment diagram that is rigth connection of LED and resistor?...pls correct me..
rgads

 

[Rns audio box]

Hi sir Apez

What is the exactly size of H-class step driver???


thanks...
Regads.

 

[apexaudio]

Hi sir Apez

What is the exactly size of H-class step driver???


thanks...
Regads.

PCB size 50x90mm

 

[apexaudio]

i used 47R for predriver and 4R7/2W for driver transistor it's OK of that value? or which a good value for the triple darlinton driver stage......base on my attachment diagram that is rigth connection of LED and resistor?...pls correct me..
rgads

Your connection of LED and resisor is right. You can use 47R and 4R7.
Regards

 

[Rns audio box]

PCB size 50x90mm

thank you very much sir apex.........

 

[A square]

hello sir
today i use tlo72 step drive bt something is wrong vd me. overdrive positive voltages is no getng stable....pls help me

thanx sir

 

[apexaudio]

hello sir
today i use tlo72 step drive bt something is wrong vd me. overdrive positive voltages is no getng stable....pls help me

thanx sir

I need more informations, voltage measurements, pictures...

 

[thunderjets]

What protect circuit you use?
Regards

i just add an oedinary kit from local store. not very good, but i think its enough

regard

 

[andrewlebon]

clipping

hi apex audio
greetings any other clipping ciruit which can be added to added
to any amp nsl 32 is rare to find need for my amp
thanking you
andrew lebon

 

[apexaudio]

hi apex audio
greetings any other clipping ciruit which can be added to added
to any amp nsl 32 is rare to find need for my amp
thanking you
andrew lebon

Use this simple limiter.

 

[apexaudio]

Limiter activate amp output voltage at clip level (or low if you want limit amp under full power) and it atenuate amp input. Clip level voltage is about 5-15V under rail voltage ( rail voltage +/-75V DC, clip level about 65V).
You can adjust limit level with different value of resistors 820R to get 2V in point 820R, 68R whan amp out is on clip level voltage.
Use formula: Rx=Uclip/0,03 or Uclip=0,03XRx
Rx is 3280R (4x820R) in schematic, Uclip is 100V this clip level is for APEX H900 you must use low value for Rx depend of rail voltage or if you want limit amp at low than full power power use formula P=(UrmsXUrms)/Rload, Urms=Uclip/1,4
Regards
________

 

[yohnsee]

Pictures of my B500

Finally, i could take a few pics of the amp, now it is wired up for test, so the final version will be a bit 'cleaner'.
Comment it, if you want to. And i hope nobody gets angry, because i stole the idea of the transistors arrangement.
Bye