PO3_150W_Power_amp

[EMX_125]

anyone_on_diyaudio_pls_help_to_upgrade_my_amplifier
i_add_2pair_of_power_transistor_and_replace_input_transistor
for_the_supply_55V-0-55VDC._if_i_mistake_pls_help.

Here_is_the_circuit_diagram...

http://img295.imageshack.us/img295/8636/150wpoweramp.png

 

[nigelwright7557]

anyone_on_diyaudio_pls_help_to_upgrade_my_amplifier
i_add_2pair_of_power_transistor_and_replace_input_transistor
for_the_supply_55V-0-55VDC._if_i_mistake_pls_help.

Here_is_the_circuit_diagram...

http://img295.imageshack.us/img295/8636/150wpoweramp.png

The diagram looks wrong to me.

You have one of the output transistors bases connected to the B- line !

 

[EMX_125]

PO3_Power_Amp

sorry_for_My_mistake.....
the_amplifier_is_made_in_china_but_the_diagram
is_draft_me_when_i_repair_this_amp_i,ll_make_to_draft
the_amplifier_circuit_design_for_i_know_the_design_of_the_amplifier
however_the_drafting_me_is_wrong
thank_for_the_reply_nigel...sorry_for_my_bad_english.




here_is_the_correct_circuit_diagram...


http://img257.imageshack.us/img257/8636/150wpoweramp.png

 

[homemodder]

Why did you have to repair it ??? Can you show a pic of the amp??

 

[81bas]

Collector and emitter of Q7 should be swapped...

 

[EMX_125]

Why did you have to repair it ??? Can you show a pic of the amp??

Because_the_power_supply_The_bridge_diode_is_smoke_and_burn_when_the_amplifier_is_working_full_power_24hours_at_my_service..
wedding_party...hehehe...so_replace_the_bridge_diode_25amp_400V.
but_i_need_to_upgrade_this_amplifier_for_more_power_the_same.
ok_if_you_like_to_see_the_amplifier_tommorrow_night_i_upload_the_pic.

 

[homemodder]

81bas is right, have to swap the legs of q7. The biggest obstacle to upgrade for more power is requirement for higher VA transformer. You need to be prepared to replace the transformer.

 

[EMX_125]

81bas is right, have to swap the legs of q7. The biggest obstacle to upgrade for more power is requirement for higher VA transformer. You need to be prepared to replace the transformer.

But_the_same_voltage?

 

[frank1]

But_the_same_voltage?

Why_the_underscores?
Is this a new language?
Makes reading very difficult :-(
FDJ

 

[EMX_125]

Why_the_underscores?
Is this a new language?
Makes reading very difficult :-(
FDJ

Im_not_a_good_speaking_english
this_thread_is_about_the_amplifier_not_a_language.
underscore?.....the_keyboard_of_my_PC_is_damage
very_difficult_to_type_tommorrow_i_replace_the_keyboard
hehehee....thanks.

 

[Aldotin]

C2=0.1uF? 😱

 

[EMX_125]

C2=0.1uF? 😱

the_correct_value_of_C2_is
33pf

hommoder_and_81bas_thanks_for_the_reply_so
here_is_the_diagram_again..


http://img338.imageshack.us/img338/8636/150wpoweramp.png

 

[EMX_125]

The_last_diagram_is_the_original_value_of_this_amplifier
But_i_guess_the_value_of_D3_D4_D5
1N4148_if_i_have_a_wrong_pls_help...
thanks...

 

[EMX_125]

PO3_Power_Amp

Here_Is_the_Pic....


http://img340.imageshack.us/img340/1724/img0071au.jpg

 

[AndrewT]

if we get sufficient versions we might yet see the original schematic, but I doubt that we will.

 

[EMX_125]

if we get sufficient versions we might yet see the original schematic, but I doubt that we will.

sorry_bcoz_the_first_schematic_is_wrong_that_i"d_make
you_know_i_have_a_little_knowledge_about_the_design
of_the_amplifier_so_many_professional_designer_here_in_the
diyer....so_why_you_will_not_to_explain_if_the_draft_me_is_wrong
any_part.....the_amplfier_is_work_not_assembled_need_to_upgrade_only.
thanks.

 

[EMX_125]

Hi_to_all_diyer....

I"ll_make_the_diagram_of_amplifier_for_my
sound_system....if_the_schematic_is_wrong_please
verify...so_what_is_the_design_of_the_circuit..?
and_also_need_to_upgrading_300watts.
thanks.

 

[AndrewT]

you promised to post the original schematic.
Where is it?
You claim you have a broken keyboard.
Your first priority should be repair or replace the busted keyboard.

 

[EMX_125]

you promised to post the original schematic.
Where is it?
You claim you have a broken keyboard.
Your first priority should be repair or replace the busted keyboard.

Sorry for the promise About the Keyboard hehehe...
The correct Schematic and Value Are Show post # 12
The Missing value Of D3 D4 D5 so if im not a mistake i guess the value of the Diodes 1N4148 signal diode but im not sure.... may you help.....

Thanks...

 

[AndrewT]

D3, D4 & D5 can be signal diodes 1n914/1n4148 or rectifier diodes 1n4001/2/3/4/

What are the voltages across
R16
R17
R18
R23
R24
R25
R26

Are R19 & R20 swapped?

Do Q8, Q9 & Q10 get warm or hot?

R1/C2 ? F-3dB ~ 5MHz!

Is the gain really +48.4dB? 58k/220r +1