QUASI Amplifier for Beginners - Page 23

A square · 19th November 2010, 02:16 PM

hello sir ...

pls tel me how can i add clip led in my amp..??

tantang · 19th November 2010, 03:36 PM

Hello Mr APEX, i have many transistors PNP. What can be able modfication from emitor follower to colector fllwr this final.....???

apexaudio · 19th November 2010, 05:03 PM

Quote:

Originally Posted by A square

hello sir ...

pls tel me how can i add clip led in my amp..??

Use this circuit

apexaudio · 19th November 2010, 05:07 PM

Quote:

Originally Posted by tantang

Hello Mr APEX, i have many transistors PNP. What can be able modfication from emitor follower to colector fllwr this final.....???

Do You want QUASI PNP output stage?

sanju21 · 19th November 2010, 06:09 PM

thanks for the amplifier schematics

. i am new to building amps.i have some queries
1 what are the rail voltages for driving 2 ohm load & using 4 pairs of o/p transistors per channel.what else i have to change.( i will be bridging two such channels to drive 4 ohm load ).
2. what will be resulting power in bridge mode when driving 4 ohm load

plz look at this link
http://www.electronica-pt.com/circuitos/en/audio-amplifiers/44-audio-amplifier-90-100w-with-2n3773.html
3. is the above ckt class b or class ab?
4. what is the differnce in qualitywise between the above design & ur design

plz dont be offended i am only a mechanical engineer

please reply to all my queries

echobase · 20th November 2010, 02:42 AM

The schematic that you mentioned, I did it and it goes out into smoke. I check and recheck with the schematic and the PCB layout, but is just didn't work. Try it for yourself! maybe you could get it right!

Best regard
Albert

echobase · 20th November 2010, 02:47 AM

I am now in the process of the making of the amplifier that shown in post #1. I'll post the result soon.

Albert

echobase · 20th November 2010, 03:56 AM

Snap_2010.11.20 12.50.36_002.png

Snap_2010.11.20 12.52.29_003.png

Is my bad not to include the images. So these are the images:

djk · 20th November 2010, 06:50 AM

I don't think the BD139/140 are rated at high enough voltage to work at ±65V, nor are the TIP 41C/42C.

noobie · 20th November 2010, 06:57 AM

Quote:

Originally Posted by djk

I don't think the BD139/140 are rated at high enough voltage to work at ±65V, nor are the TIP 41C/42C.

for +-75 to 80v any substitute for mje15032/33?

19th November 2010, 02:16 PM	#221
A square diyAudio Member Join Date: Aug 2010 Location: tasmania	hello sir ... pls tel me how can i add clip led in my amp..?? __________________ jon

19th November 2010, 06:09 PM	#225
sanju21 diyAudio Member Join Date: Aug 2005 Location: Gurgaon,Haryana	thanks for the amplifier schematics. i am new to building amps.i have some queries 1 what are the rail voltages for driving 2 ohm load & using 4 pairs of o/p transistors per channel.what else i have to change.( i will be bridging two such channels to drive 4 ohm load ). 2. what will be resulting power in bridge mode when driving 4 ohm load plz look at this link http://www.electronica-pt.com/circuitos/en/audio-amplifiers/44-audio-amplifier-90-100w-with-2n3773.html 3. is the above ckt class b or class ab? 4. what is the differnce in qualitywise between the above design & ur design plz dont be offended i am only a mechanical engineer please reply to all my queries

20th November 2010, 03:56 AM	#228
echobase diyAudio Member Join Date: Apr 2009 Location: Song, Malaysia	Is my bad Snap_2010.11.20 12.50.36_002.png Snap_2010.11.20 12.52.29_003.png Is my bad not to include the images. So these are the images:

20th November 2010, 06:50 AM	#229
djk diyAudio Member Join Date: Feb 2001 Location: USA	I don't think the BD139/140 are rated at high enough voltage to work at ±65V, nor are the TIP 41C/42C. __________________ Candidates for the Darwin Award should not read this author.

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19th November 2010, 03:36 PM	#222
tantang diyAudio Member Join Date: Aug 2010 Location: indonesia	Hello Mr APEX, i have many transistors PNP. What can be able modfication from emitor follower to colector fllwr this final.....???

20th November 2010, 02:42 AM	#226
echobase diyAudio Member Join Date: Apr 2009 Location: Song, Malaysia	The schematic that you mentioned, I did it and it goes out into smoke. I check and recheck with the schematic and the PCB layout, but is just didn't work. Try it for yourself! maybe you could get it right! Best regard Albert

20th November 2010, 02:47 AM	#227
echobase diyAudio Member Join Date: Apr 2009 Location: Song, Malaysia	I am now in the process of the making of the amplifier that shown in post #1. I'll post the result soon. Albert

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