Does anyone have experience or a recommendation for a voltage regulator for the dfplayer.
Input 5v, output 4.2v, possible a LDO regulator. The dfplayer output 3w @ 4.2v is just over .7a.
The problem I have is I think I need to keep the 5v rail @5v as from this the Arduino, RFID and logic level converter is taking power from this, unless it could all work on 4.2v (logic level converter) then a buck converter which is more efficient will be too big for the space where my circuit is going to go.
How accurate do you need your 4.2v to be?
I've done this simply with a series silicon diode .
Allan
Why do you think you need a 4.2V supply? Anything from 3.2V to 5V should be fine.
allanhurst:
How accurate do you need your 4.2v to be?I've done this simply with a series silicon diode .
Allan
Dfplayer drawing nearly .8 amp max the diodes got quite hot. I brought some and have tried it, other option would be to use the other speaker out I guess to then be amplified later on. Is that what you did? It used bigger diodes, can't remember the ones I used something like n4001, and didn't get the .7v drop as stated.
PaulRB:
Why do you think you need a 4.2V supply? Anything from 3.2V to 5V should be fine.
I have read the recommendation is 4.2v and others having audio pops and cracks etc when using 5v.
Regards
4.2V is not a regularly used supply voltage, I doubt the player was designed with that voltage in mind. I also doubt that the supply voltage of 4.2 Vs 5.0 makes much difference to the audio quality. I would be interested to hear the results, if you do some experimenting. The DFPlayer is cheap 'n cheerful. If audio quality is so important, something higher quality with a better amplifier and speaker(s) is appropriate.
Cheers, will try it on the 5v rail, I think I've found the problem, they have been using the 5v from Arduino and not a dedicated supply, hence possibly dirty supply voltage at the higher range of current drawn.