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Old 20th August 2012, 08:57 AM   #1
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Default Cheap 150watts amplifier

Hi this amplifier is origanaly found on circuittoday.com by seetharaman i am just posting it am trying to make it but before that i want some discussion on it

for detail please visit 150 Watt Power Amplifier Circuit Board
and 150 Watt Amplifier Circuit
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File Type: pdf 150wamppcb.pdf (10.0 KB, 255 views)

Last edited by sanbadgujar; 20th August 2012 at 09:27 AM.
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Old 20th August 2012, 09:40 AM   #2
Bone is offline Bone  United Kingdom
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Oh dear not this one again! You will not get 150 watts out of this amplifier. The SOA of the out put transistors will not allow it and they WILL fail. If you are lucky you may get half that 75 watts, but you will need a huge heat sink. This was originally "designed" by a guy called John Fisher/Tyrone and has never been tested at 150watts. See here: Cheap 100 to 150 Watt Amp
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Old 20th August 2012, 10:07 AM   #3
AJT is offline AJT  Philippines
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agreed, good for beginners but do not use 45volt rails, start with a lower rail of say 20volts.....
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Old 20th August 2012, 10:44 AM   #4
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i wonder why nobody managed to remove this circuit from the internet ...

Probably it stays there to support the production of TIP 142-147 ....i presume that manufacturing companies love it .....The average inexperienced user will probably blow some of them before he understands that this is a crap with a catchy title ...
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Old 20th August 2012, 10:58 AM   #5
AJT is offline AJT  Philippines
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yes that will be the price of tuition.....letting out the magic smoke.....didn't we all experience that at some point?
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Old 21st August 2012, 05:13 AM   #6
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OK Tony give me good amplifier for +/- 45 v 5A supply around 100watts for 8ohum load
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Old 21st August 2012, 05:26 AM   #7
AJT is offline AJT  Philippines
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here:60-80W Power Amplifier and DIY Audio Projects Forum • Elliot Sound Products - P3A 100W Amplifier
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Old 21st August 2012, 06:43 AM   #8
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Can you give me PCB layout for 60-80w power amplifier as you mention and parts list thanks
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Old 21st August 2012, 09:23 AM   #9
Bone is offline Bone  United Kingdom
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Check out threads for P3A in this forum, there are plenty with PCB layouts.
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Old 21st August 2012, 11:29 AM   #10
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Thanks Tony please give suggestion which amplifier is good for home hi fi system
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