The easiest solution is to use an amplifier IC, such as LM386.
LM386 is not good for this aim. It's quality is better suited to portable radios.More like to build an amp that will produce sound as clear as it can.(With no distortions etc, I'd like the best audio quality...
LM386 is not good for this aim. It's quality is better suited to portable radios.
Other IC's, such as LM3886, give very good quality. It is usually used for higher power like 40W to 50W, but you could use it with a lower voltage supply e.g. +-12V to +-15V for lower output power.
Note: The name is similar, but LM3886 is very different to LM386.
You could also build an amplifier with discrete transistors, but this is likely to cost more.
Sorry, I forgot it had to be portable, thus battery powered. Even two 9V batteries wouldn't be enough.LM3886 seems to be very nice choice. But, how can I power it with so many Volts?
Yes. That may be your best option. Unfortunately I don't have any circuits for battery-powered amps. Hopefully someone else can help.Actually, I have a lot of transistors...
So could I build something with transistors only?
It's worth just sticking to batteries for now (say 6V or 9V), because the PSU may be causing issues.
Also, definitely remove the capacitor between pins 1 and 8 for now, to reduce the gain.
The LM386 has quite high gain, so that is possible that the input may be too high. Also, keep the cable
short (or screened) at the input.
It's been a long time since I used an LM386, but I can't think of any other reason for audio problems with it.
Is this on a plastic breadboard or stripboard? It might be worth trying to keep component wires short, in case it
is causing any issue.
Finally, it may be worth replacing the speaker with some headphones briefly to check the circuit (the 4ohm impedance
of the speakers may be too low).
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