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Old 7th October 2014, 07:07 PM   #1
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Default An audio amplifier from what I have available

I'm looking to start a project to build an audio amplifier, but I'm on a tight budget and would like to use what I have available. I'm asking for schematic ideas, design samples etc. Where these would work well.

I want a stereo amplifier which can drive 2x15W speaker with an 8 ohm impedance.

What I have available is 5xMN2488 and 5xSP1620 (Sanken), aswell as an STK350-230, 2xUPC2581V and a pair of MJE1530/MJE1531. If possible I'd like to use a 2x30VAC toroid (60VA each) that I have, but making the power supply won't be an issue.

Anyone know of a schematic that could utilize these components? Or any other ideas?
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Old 8th October 2014, 08:21 AM   #2
djk is offline djk
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The semiconductors are the least expensive part of the amplifier cost.

15W (headphone) amp from McIntosh C32 preamp, used the MJE1530/31 for outputs.

C32 Photo by dkleitsch | Photobucket

The 2x30VAC toroid (60VA each) will give 42V DC (and about 60W/8Ω), so you will not be able to use it.

36VCT is more what you will need for 15W/8Ω.
Candidates for the Darwin Award should not read this author.
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Old 8th October 2014, 12:48 PM   #3
wg_ski is offline wg_ski  United States
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How about a single 42V supply? Parallel the 30V windings instead of series. Then build a simple capacitor coupled design, like the DX Trust. 15030/1 will work for outputs, or pick up a couple TIP41/2 pairs for next to nothing. Everything else can be six-cent small signal devices - and they type numbers aren't even that important on a 42V rail. Scavenged "unknown" devices would work - as long as polarity is right (and that can be tested).
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