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Old 20th November 2016, 06:24 AM   #1
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Default quasi complementary amplifier 2n3055 pcb

I have a lot of old 2N3055 transistor so I wanted to build a quasi complementary amplifier, I searched a lot, but coudn't find a good pbc layout. So does anybody have a pcb layout for it ?
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Old 20th November 2016, 04:45 PM   #2
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The Apex AX6 works. PCB layouts are in this thread: Retro Amp 50W Single Supply
With real homotaxial process (1968-1975?) parts, don't exceed about 60 v rail voltage (no minus voltage on this schematic). Unless you test for acceptable leakage current with base shorted to emitter at what higher voltage you choose. Newer parts can be tougher at higher voltage than the original design parts.
Use a regulated power supply rail. AX6 doesn't have a lot of constant current transistors that reject power supply variation. You can use a 2n3055 as a series pass power supply regulator, but you'll need a booster transistor with a heat sink (TO220 or TO5) to sense the zener diode and drive the base of the 2n3055. Or if you're ordering a box of something, a couple of parallel TIP142 darlingtons are ~$1 each, the emitter current sharing .33 ohm resistors are 5 for $1. I used five TIP142 parallel for two channels of output transistors, but I listen to classical music and like a lot of current occasionally for the cannon shots or drum hits.
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Last edited by indianajo; 20th November 2016 at 04:57 PM.
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Old 20th November 2016, 04:57 PM   #3
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