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Old 15th August 2010, 08:02 AM   #1
shreya is offline shreya  India
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Location: Andhra Pradesh
Default 100watt guitar amplifier

can i give +/-48v to this circuit

what i have to change in the circuit diagram

if anybody have pcb you can send it to me at mounicashreya@ymail.com
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Old 15th August 2010, 10:04 AM   #2
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NO! Vceo is on the "hairy edge" for those devices (BCxxx BDxxx) , amp can only take + - 35v .... safe at 30-0-30VDC. Tip outputs are only good to 80V rail to rail. Might work for a while , then POOOOFTTT!
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Quad core Athlon - Asus essence sound (PCM 1792A) - Slewmaster "Spooky Leach" 200W amp (final favorite).
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Old 15th August 2010, 10:14 AM   #3
wahab is offline wahab  Algeria
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Join Date: Nov 2009
Location: algeria/france
TIP35C/36C are 100V VCE devices but the drivers BD139/140
are only 80V.
Strange thing is the use of BC559 for the differential.
They are only 30V vce..Better to use BC556B devices...
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Old 15th August 2010, 10:32 AM   #4
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
a 3rd no, just to convince you that this schematic using low voltage devices is intended for use with a low voltage PSU. Probably +-30Vdc to +-35Vdc.
Expect maybe 50W into 8ohm.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 15th August 2010, 12:13 PM   #5
Bone is offline Bone  United Kingdom
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Join Date: Jun 2004
Location: Dorset, UK
This an ESP design. If you want the PCB you'll have to buy it from him < 100W Guitar Amplifier (Mk II) > . He makes his living from these designs so it would be unfair, immoral and possibly illegal to spread the pcb layout around.
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