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QUASI Amplifier for Beginners
QUASI Amplifier for Beginners
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Old 19th November 2010, 02:16 PM   #221
A square is offline A square  Australia
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hello sir ...

pls tel me how can i add clip led in my amp..??
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Old 19th November 2010, 03:36 PM   #222
tantang is offline tantang  Indonesia
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Hello Mr APEX, i have many transistors PNP. What can be able modfication from emitor follower to colector fllwr this final.....???
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Old 19th November 2010, 05:03 PM   #223
apexaudio is offline apexaudio  Serbia
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Originally Posted by A square View Post
hello sir ...

pls tel me how can i add clip led in my amp..??
Use this circuit
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File Type: jpg APEX clip led.jpg (35.0 KB, 1113 views)
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Old 19th November 2010, 05:07 PM   #224
apexaudio is offline apexaudio  Serbia
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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?
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Old 19th November 2010, 06:09 PM   #225
sanju21 is offline sanju21  India
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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
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Old 20th November 2010, 02:42 AM   #226
echobase is offline echobase  Malaysia
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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!

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Albert
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Old 20th November 2010, 02:47 AM   #227
echobase is offline echobase  Malaysia
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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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Old 20th November 2010, 03:56 AM   #228
echobase is offline echobase  Malaysia
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Default 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:
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Old 20th November 2010, 06:50 AM   #229
djk is offline djk
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I don't think the BD139/140 are rated at high enough voltage to work at 65V, nor are the TIP 41C/42C.
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Old 20th November 2010, 06:57 AM   #230
noobie is offline noobie  Philippines
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Default mje15032/33=TIP???

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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?
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