JamesL
1000+ Head-Fier
- Joined
- Dec 5, 2007
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I'm at my parent's house for about 2 more weeks, and they wanted to know if I could build an amp for their in-wall speakers.
This is my first venture into a speaker amp, I have limited tools with me now, and I have limited information on the speaker requirements, so I'd really appreciate some guidance and perhaps some intuitive guesswork/estimates for what kind of power output I should be shooting for, if the heatsink looks capable enough, etc.
I couldn't find any specs on the speakers, but the previous owner noted that "50w is more than plenty". There are 4 separate volume controls and 2 woofers per control.
So far, I've scavaged a few potential cases, a hefty chunk of heatsink and a few smaller ones, switches, iec inlet & fuse, and some perfboards from broken electronics around the house.
I'm thinking of building a lm3886 or lm3875-based amp because of it's simplicity and popularity, though I'm also open to any class-D amps that may work.
If I go with a lm3886 gainclone, should I strictly follow the circuit on the datasheet? What kind of power supply is a good compromise, considering the ambiguous speaker specs and a single heatsink about yay big?
Antek has 100va toroids for $30 shipped, but I'm not sure if its sufficient. I have to buy furniture when I get back to school, so I really am on a 'starving-student' budget.
This is my first venture into a speaker amp, I have limited tools with me now, and I have limited information on the speaker requirements, so I'd really appreciate some guidance and perhaps some intuitive guesswork/estimates for what kind of power output I should be shooting for, if the heatsink looks capable enough, etc.
I couldn't find any specs on the speakers, but the previous owner noted that "50w is more than plenty". There are 4 separate volume controls and 2 woofers per control.
So far, I've scavaged a few potential cases, a hefty chunk of heatsink and a few smaller ones, switches, iec inlet & fuse, and some perfboards from broken electronics around the house.
I'm thinking of building a lm3886 or lm3875-based amp because of it's simplicity and popularity, though I'm also open to any class-D amps that may work.
If I go with a lm3886 gainclone, should I strictly follow the circuit on the datasheet? What kind of power supply is a good compromise, considering the ambiguous speaker specs and a single heatsink about yay big?
Antek has 100va toroids for $30 shipped, but I'm not sure if its sufficient. I have to buy furniture when I get back to school, so I really am on a 'starving-student' budget.