lm386 amp without negative power supply
I am really new to building amps and find it a really interesting hobby to dabble in. Lately I've been building small o-amp circuits using our test equipment provided at school. The nice thing is that the power supplys there have a negative supply rail.
Now while at home I have an amp built, but only a single positive source power supply. I am wondering if there is a way to bias it so that I can somehow get a -v and +v output out of it. So say it can output +20v, can I somehow bias it so that 10v is common and it can swing either way? Does this seem like a realisitc thing to do, or should I build a new supply with a positive and negative rail?
Hopefully I made my first post in the right place :cool:
Welcome to this forum..Yes it is possible to run power amps with single psu...Do search the forum..
LM386 is NOT designed for use of dual supply, positive, 0V and negative.
It is designed for single supply.
If you use maximal 12 Volt supply, with +V and Ground connections,
the input terminals will be at Ground level.
This means you can use input without input capacitors.
( If your source has DC-offset, you need an input capacitor ~1uF )
The output will be at 50% of 12 Volt = 6 Volt,
so you NEED an output cap, to protect loudspeaker from this voltage.
In my attached, normal circuit with minimum components, I would use a 1000uF in place of 250uF output capacitor.
I think that triden is actually talking about the LM3886, but he missed one eight :)
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