Hello, I am a beginner at electronics. I have two AC to DC converters ((3),(5) in image). The converter with the number 3 is connected parallel with my room's light bulb. It converts 220v AC to 12V DC 1.2 A. The converter number 5 is a small 220v AC to 12v DC 450mA converter. Devices 4 and 6 are arduinos. Number 7 is a switch. and number 1 electricity mains. The problem is that when I attach the number 5 on the circuit then it draws all the current and number 3 does not light up. Why?
Update:
I have an arduino inside my light switch which takes values from a trimmer and send it to a Central Arduino which send them to the Arduino which is parallel connected to the light bulb and dimms the light using a phase control module.
when I disconnect the inverter number 5 the circuit works perfectly. When I connect it back the LED on the converter number 5 turns constantly on but the LED on the converter number 3 turns on for some milliseconds and fade out. With a result the arduino parallel connected to the light bulb to not work
Update 2:
This is the complete circuit. I use nrf24l01 modules to communicate between arduinos. The dimmer is a circuit that detects the zero-crossing and uses a triac to control current. There is a tutorial on Instructables.
Best Answer
@Christos, 5 requires a live and neutral connection from the mains.
With your poor understanding of electrical circuits at the moment you should not be doing any mains wiring. Stick to low voltages. Use plug-in power supplies and only plug them into sockets - not the lighting circuits.
[Edit after Christos' update.] There are a few problems but let's make an easy example. Let's say you have a 100 W lamp and a 5 W Arduino power supply and let's make the maths easy by saying the mains voltage is about 200 V. The bulb would draw 100W / 200V = 0.5 A on full mains voltage. The PSU would draw 5W / 200V = 0.025 A. Since they're in series the PSU will limit the current and the lamp may glow a little but certainly won't light up.
Your circuit doesn't show a dimmer element in series with the light bulb so it's hard to know how you're hoping to control it.