Recently bought a few of these to experiment and learn.
PAM8403 Audio Module DC 5V Mini Class-D digital amplifier board LCD T5 | eBay
Was thinking of using them to power a couple of speakers connected to my portable mp3 player (Sansa Slip +).
Do I need a preamp between the mp3 player and the PAM8403?
PAM8403 Audio Module DC 5V Mini Class-D digital amplifier board LCD T5 | eBay
Was thinking of using them to power a couple of speakers connected to my portable mp3 player (Sansa Slip +).
Do I need a preamp between the mp3 player and the PAM8403?
This particular IC has an input voltage range of .5v-1.2v according to the datasheet. I could not find the input Z but given that their test diagram shows a tone generator hooked directly to input I don't think you will need a preamp or buffer. A CD player has a 2v output at its RCAs as a standard, for your reference.
Here are the specs for the Sansa Clip +:
NwAvGuy: Sansa Clip+ Measured
My initial question comes from the fact that I used this same player with a weaker LM386 amp and although it's loud, there seems to be some tone loss.
LM386 Audio Amplifier Module 200 Times 5V-12V Input 10K Variable Resistor DIY | eBay
Would this one benefit from a some sort of FET preamp?
NwAvGuy: Sansa Clip+ Measured
My initial question comes from the fact that I used this same player with a weaker LM386 amp and although it's loud, there seems to be some tone loss.
LM386 Audio Amplifier Module 200 Times 5V-12V Input 10K Variable Resistor DIY | eBay
Would this one benefit from a some sort of FET preamp?
Consumer-grade players have an output in the .75 volt range, the manufacturer expects them to drive either headphones or powered speakers, so no preamp should be needed.
The LM386 is an excellent chip for its purpose, but nobody has ever accused it of being hi-fi (except in the Headbanger headphone amp). You can't really make a direct comparison.
EDIT: Or, as SonyFan says, 2 volts. Either way no preamp.
The LM386 is an excellent chip for its purpose, but nobody has ever accused it of being hi-fi (except in the Headbanger headphone amp). You can't really make a direct comparison.
EDIT: Or, as SonyFan says, 2 volts. Either way no preamp.
A preamp would only complicate things more, but you could build an extremely small and simple one with op amps.
Unfortunately I have not been able to test you suggestion this weekend but I just came across this project, which seems to work..
The Single NPN Transistor Audio Preamp | HACK A WEEK
The Single NPN Transistor Audio Preamp | HACK A WEEK
Portable headphone devices will typically deliver a maximum output of 500 mv rms before clipping. Since the music is normally recorded much lower, you may find the 24db gain to be a bit low.
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