Hello
i am experiencing a problem with the 5volts power supply of Arduino
This is a project to provide an electronic set for a prop helmet with voice amplifier, thermal activated fans and sound effect
the set includes:
Arduino Nano
DHT 11 temperature sensor
WT5001M02-28P Mp3 sound module
http://www.microelectronicos.com/datasheets/WT5001.pdf
LM393 Sound sensor
http://www.ebay.it/itm/171219012684?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
d.s. http://www.ti.com.cn/cn/lit/ds/symlink/lm393-n.pdf
2x fans 5volts 0,10 Amp
2x NPN transistors 2N2222A (40V 0,6A)
mini amp 3w + 3w
http://www.ebay.it/itm/181303482967?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
d. s. http://diodes.com/datasheets/PAM8403.pdf
in the project, the microphone of the sound sensor shoud be used also as voice microphone: that mono channel audio input sould be mixed with the stereo channels of the mp3 sound module and linked to the mini amp (following this schematic Simple mixer )
the problem:
the 5volts output of arduino nano doesn't give power to the components. After installing everything except the miniamplifier, the components doesn't turn on and the 5volt output of arduino shows 0volts. I tried uninstalling the themperature and module and speakers and this way the sound sensor works. When i connect the speaker to the mp3 sound module the voltage turn back to 0volts.
I don't understand why the 5volts output power regulated of the arduino seems not enought while the overall amperage of the modules is quite low (the sound sensor only 0,4mA, the mp3 sound module max 40mA..)
What is wrong ? 
