Issues With Stereo Audio(Pi3+PAM8403+ Kedei HDMI)

[joeygbsn]

I prefer NOT to draw power from the PI. Remember that the 5V pin supply on the Pi 3 is ~750mA (source https://raspberrypi.stackexchange.com/q ... imitations).

That link basically says that it depends on your power supply. The 750mA you're referring to is their estimate for the current draw of the pi3. So if you had a 2.5A power supply and the pi3 was drawing 750mA then you could draw 1.75A from the 5V pin. You also need to account for the current draw of any other loads you have on the usb ports or anything else.

[DeRock89]

I prefer NOT to draw power from the PI. Remember that the 5V pin supply on the Pi 3 is ~750mA (source https://raspberrypi.stackexchange.com/q ... imitations).

That link basically says that it depends on your power supply. The 750mA you're referring to is their estimate for the current draw of the pi3. So if you had a 2.5A power supply and the pi3 was drawing 750mA then you could draw 1.75A from the 5V pin. You also need to account for the current draw of any other loads you have on the usb ports or anything else.

Do you think it could have anything to do with me only using the 5v 2.5a power supply and not having the battery connected?

[joeygbsn]

Do you think it could have anything to do with me only using the 5v 2.5a power supply and not having the battery connected?

I'm not super familiar with the 1000c but trying with a battery couldn't hurt.

[DeRock89]

Do you think it could have anything to do with me only using the 5v 2.5a power supply and not having the battery connected?

I'm not super familiar with the 1000c but trying with a battery couldn't hurt.

Installing the battery AND having it plugged in did at least keep the screen from kicking on and off when the power is turned up but I'm getting a lightening bolt symbol in the upper right corner when the volume is turned up.
This only happens when a game is playing.

[DeRock89]

its good you narrowed the issue down....

i was seriously consider changing the wiring points on the screen, it may improve power the power going to the screen

1UP has his builds wired like this....




its worth a try....


.

I changed it to the wiring points in this picture. It didn't change anything as far as the screen going on and off.

I connected the battery and still get the same issue. If I connect the battery AND have it plugged into the power supply then the screen does not power off and on but I'm getting a lightening bolt in the upper right corner of the screen when the volume is turned up to a certain point(not that high)

I did also try turning the volume up very slowly and the lightening bolt symbol appears right before the point that it's starts going off and on.

Further update: I just tried to check how many volts the battery has to determine charge level and I accidentally bridged the leads for a split second and now the battery isn't working.... ugh....

[DeRock89]

I prefer NOT to draw power from the PI. Remember that the 5V pin supply on the Pi 3 is ~750mA (source https://raspberrypi.stackexchange.com/q ... imitations).

I see that you now use power strip for the three components, that would help. As for the capacitors you only need it if the supply is unstable (that is whay it is called "smoothing" capacitor). You would need to wire the capacitor on the powerstrip, checkout this build viewtopic.php?f=43&t=1615&hilit=sota&start=20.

As for the FPV cable if you have a spare..I'll have it. I will pay full price plus postage as this will save me the waiting time...

Sorry for all the links

you can just have one. It may be 30cm though. If you're in the states, then I think I can just send it in a regular envelope since it's so light and thin.

I tried connecting the battery and if I have it plugged in at the same time, the screen does not kick on and off but I do get a lightening bolt symbol on the screen.

[DeRock89]

I don't know if this will help, but I drew a diagram of everything to do with power in my build.

I guess technically there are 4 devices pulling power;

1)RPi3
2)Kedei HDMI screen
3) PAM8403 Audio Amp
4) leronardo pro micro(through Pi3 USB)

[DeRock89]

I'm wondering if the super tiny speakers im using could have anything to do with it. It's crazy to me how many abarancies I'm finding

I attempted to measure how many mA the audio amp is pulling and my multimeter was jumping all over the place. I think I saw mA readings upwards of around 150mA.

[DeRock89]

I just realized something and it's got me worried. The NEW speakers I just ordered Sunday to replace the duds I bought that were too small and blew my be rated too high and cause even more current draw. I got a set from JQ sabers that are rated for 3W at 4 ohm impedance and another set from mouser with the same rating.

Am i correct to assume that this will cause even greater power draw issues?

I figured, old speakers were rated too low and blew. Amp is 3 watts so I need 3 watt speakers, and the only 3 watt speakers with the correct size I need are 4 ohm and not 8. Data sheet for PAM8403 says it can do 4 and 8 ohm...

[vnman]

The Power Boost can only supply 1A @ 5V right?

I could be wrong -

The Pi 3 uses ~750mA idle
PAM 8403 at max volume uses 12mA
pro Micro 5V 16MHZ uses 12mA or there about.
Kedei HDMI display - could not find info on power consumption. If you find out then you can work out how much ampere you need to power everything.