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?
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?
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.
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.
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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