Anyone tinker with these? Can they be bridged? 5V alternatives?
Looks good to run with a solar/powerbank setup. Curious to see what it will do with a high efficiency PA driver. Ordered a bunch to see
Looks good to run with a solar/powerbank setup. Curious to see what it will do with a high efficiency PA driver. Ordered a bunch to see
Like most class-D amps it is already bridged internally and so cannot be further bridged. Not sure it can be paralleled either - block diagram shows two independent modulators.
With only single 5V supply AB mode is going to be very limited for clean output power.
With only single 5V supply AB mode is going to be very limited for clean output power.
https://image.dfrobot.com/image/data/DFR0119/pam8403.pdf
Cant find anything about bridge mode in the data sheet either. Office advised that a large Ali package arrived today, so there will be 10 of these boards in there amongst other goodies. I don't mind frying a few boards in testing. Is there a way to hookup an expendable speaker to test if bridging is possible?
Cant find anything about bridge mode in the data sheet either. Office advised that a large Ali package arrived today, so there will be 10 of these boards in there amongst other goodies. I don't mind frying a few boards in testing. Is there a way to hookup an expendable speaker to test if bridging is possible?
They cannot be bridged, the datasheet shows that they already are internally. See: https://www.mouser.com/datasheet/2/115/PAM8403-247318.pdf . I'm also searching for a 5V powered chip amp. The PAM8403 does work fine but real power is about 1W before distortion becomes noticeable. Be sure to notice the warning on the datasheet:
1. When the PAM8403 works with LC filters, it should be connected with the speaker before it's powered on, otherwise it will be damaged easily.
2. When the PAM8403 works without LC filters, it's better to add a ferrite chip bead at the outgoing line of speaker for suppressing the possible electromagnetic interference.
The last one is a bit of understatement. The wires from the chip outputs to the speakers are spewing out a lot of electromagnetic interference. Either place the amplifier board directly on the driver terminals, or add at least the suggested ferrite bead.
Ok, thanks man. I can use them on the terminals as you suggest. The boards are just to tinker with and see what the low power things can do. Check out the Roland Boss eBand JS-10 specs for power. Trying to replicate a similar very low power 2.1 system using 5v