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Old 27th March 2012, 08:45 PM   #1
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Default Simple high quality audio amp using tip41 & tip42

I have build this amp.I have attached the schematic & completed photo of amp.You have to just replace transistor MJE3055 with TIP41 & MJE2955 with TIP42 in the schematic.
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Old 29th September 2013, 04:48 PM   #2
mangga is offline mangga  Indonesia
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thank you
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Old 29th September 2013, 04:53 PM   #3
Mooly is offline Mooly  United Kingdom
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TIP41 aren't suitable due to the low 40 volt rating. For a 70 volt supply (which is what this amp shows and is what the devices can see under drive) you must use at least TIP41B (marginal at 80 volt) or preferably TIP41C (100 volt)
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Old 11th December 2013, 03:16 PM   #4
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What is the max output power??
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Old 11th December 2013, 04:53 PM   #5
Mooly is offline Mooly  United Kingdom
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Its easy to work out.

-/+ 35 volt rails gives an output swing of -/+35 less say 5 volts losses across the transistors and 0.22 ohm resistors.

So -/+30 volts is 21 volts RMS. (calculated by taking Vpeak which is 30, and multiplying by root 2)

Watts is V squared/R so put your own numbers in now. For example its 27 watts into 16 ohm.
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Old 15th December 2013, 12:08 AM   #6
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Default TIP41 TIP42

470uf 100 volts to be used on supply rails
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Old 15th December 2013, 11:10 AM   #7
ATAUDIO is offline ATAUDIO  Austria
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Quote:
Originally Posted by rrbadrike View Post
I have build this amp.I have attached the schematic & completed photo of amp.You have to just replace transistor MJE3055 with TIP41 & MJE2955 with TIP42 in the schematic.
It looks like the Rod's ESP original P3 Project - see- High Quality 60 Watt Power Amplifier
or also his guitar amplifier, apart for your (questionable, as others have reported) choice of the outputs.
In such case at least credits should be given to the original author.
However, such amplifier (in its evolution P3A) has proven really good to me for P.A. use, in "emergency" situation.
See - THIS THREAD
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