ESp P3 amp on Cheap 150w amp board - diyAudio
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Old 30th April 2013, 07:38 AM   #1
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Default ESp P3 amp on Cheap 150w amp board

Is the pcb for the 150 w amp suitable for esp P3 amp??? Ill be cutting the collector tracks and will put 220 ohm resistors in series with the collectors of Q1 and Q2 and bypass D1 R10 and R12. I have attached the P3 diagram and the 15o w amp pcbs and ckt diagram .
Attached Images
File Type: gif p03-fig1a.gif (5.3 KB, 285 views)
File Type: jpg 150wbotpix.JPG (305.4 KB, 281 views)
File Type: jpg 150wtoppix.JPG (283.7 KB, 260 views)
File Type: jpg 150waltsch.jpg (71.9 KB, 258 views)
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File Type: pdf 150wamppcb.pdf (10.0 KB, 49 views)
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Old 30th April 2013, 08:24 AM   #2
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P3 is a discrete CFP design and the PCB/schematic shown is an integrated Darlington (TIP142/7) design. 'Pretty hard to marry those without a mess, neglecting the front end differences even.
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Old 30th April 2013, 09:11 AM   #3
Bone is offline Bone  United Kingdom
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Not compatible I'm afraid. As a matter of interest where did you get the boards for the 150w amp?
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Old 30th April 2013, 10:19 AM   #4
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I was goin to build the amp up till the driver stage (BD 139 140) and connect the power transistors ( I'm using 2n3055 and mj2955 BTW) with flying leads.
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Old 30th April 2013, 10:21 AM   #5
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Hey Bone here's the link 150 Watt Power Amplifier Circuit Board
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Old 30th April 2013, 10:59 AM   #6
Bone is offline Bone  United Kingdom
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Thanks.
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Old 30th April 2013, 11:12 AM   #7
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Hey bone can I use the board now??????
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Old 30th April 2013, 01:35 PM   #8
AndrewT is offline AndrewT  Scotland
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You don't need to cut the collector tracks.
Bend the transistor collector lead up through 180degrees. Solder on a collector resistor pointing down. The new three legged device will fit the old pad arrangement.

Add pads for base stoppers on all your driver and output devices. Again a bent base lead with added resistor allows for no PCB modification.

Add a resistor to convert the input C (change the C from 100pF to somewhere from 330pF to 1nF) to an RF R+C filter.

Add HF decoupling to the collector leads of the output devices.
Add MF decoupling to the supply rails near the output devices.
Add MF decoupling near the input stage supplies.
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Last edited by AndrewT; 30th April 2013 at 01:39 PM.
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Old 1st May 2013, 11:16 AM   #9
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Thanks a lot. Here are the pics of my P88 preamp im goin to use with the amp. Im using the version ROd used for his Gainclone amp project. i hav not yet mounted the output caps. i was wondering whether i should use input caps to protect my source incase the opamp fails.
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File Type: jpg IMG_0254.jpg (232.0 KB, 175 views)
File Type: jpg IMG_0255.jpg (268.9 KB, 58 views)
File Type: gif p115-f5.gif (14.5 KB, 86 views)
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Old 1st May 2013, 11:34 AM   #10
AndrewT is offline AndrewT  Scotland
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Make the highest gain resistor fixed, not switched.
Then switch in alternative gains.
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