Hello again, I made a little electronic gadget for my guitar pedals, let me explain my little gadget first. It's a 5volts 10k mah powerbank tied to a little dc-dc conventer that rated 1.5v & 36v 3amps
When I daisy chain it to few pedals at 9 volts which drawing like 300ma at total, it works great, problem arises when I chain it for like 5+ pedals.
If all pedals switched on, powerbank and all the leds of pedals flashes rapidly 3 times and I lose the power and powerbank turns off.
Then I tried something different, I changed my dc-dc's output to 18volts and plugged in to a power supply that designed for pedals, samething happened again all leds including power supply's flashed rapidly but weaker for 3 times then powerbank shutdown itself again...
My question is how can I make this setup to engage and keep my power supply running, because I have no problem powering and cranking my Yamaha Thr10c amp. It has a power adapter that rated 15v 3A. Somehow I just can't draw enough power for 9V 1A or just the power supply itself which is like 18V 200ma without anything attached.
Any help would be great !
Edit: changed my question
When I daisy chain it to few pedals at 9 volts which drawing like 300ma at total, it works great, problem arises when I chain it for like 5+ pedals.
If all pedals switched on, powerbank and all the leds of pedals flashes rapidly 3 times and I lose the power and powerbank turns off.
Then I tried something different, I changed my dc-dc's output to 18volts and plugged in to a power supply that designed for pedals, samething happened again all leds including power supply's flashed rapidly but weaker for 3 times then powerbank shutdown itself again...
My question is how can I make this setup to engage and keep my power supply running, because I have no problem powering and cranking my Yamaha Thr10c amp. It has a power adapter that rated 15v 3A. Somehow I just can't draw enough power for 9V 1A or just the power supply itself which is like 18V 200ma without anything attached.
Any help would be great !
Edit: changed my question
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Hello!
What is the maximum current that your power bank can supply?
I don't know your model, but I took a model, as an example (Powerbank 10000mAh PB212)
Specs are 10Ah, 5V and 2A maximum. So, it is only capable of 5x2=10W.
You mentioned few pedals at 9V consumes 300mA, so 9*0,3=2.7W
You said that with 5+ pedals it shuts off.
You need to check total current your pedals consume and multiply by 9 to find total power.
This will be your power. Considering the DC-DC converter has a 90% efficiency, you need to divide total power by 0.9.
It must be less than 10W, otherwise power bank will shut down in case it has the same specs of what I took as example (5V/2A).
If I understood, you are able to power your Yamaha amp with this power bank.
But, amplifier has dynamic consumption. As long as you don't put a sinewave on it and max the output power or drive it to full distortion, it can consume way below the max rated power.
On the other hand, pedals have more constant power consumption.
What is the maximum current that your power bank can supply?
I don't know your model, but I took a model, as an example (Powerbank 10000mAh PB212)
Specs are 10Ah, 5V and 2A maximum. So, it is only capable of 5x2=10W.
You mentioned few pedals at 9V consumes 300mA, so 9*0,3=2.7W
You said that with 5+ pedals it shuts off.
You need to check total current your pedals consume and multiply by 9 to find total power.
This will be your power. Considering the DC-DC converter has a 90% efficiency, you need to divide total power by 0.9.
It must be less than 10W, otherwise power bank will shut down in case it has the same specs of what I took as example (5V/2A).
If I understood, you are able to power your Yamaha amp with this power bank.
But, amplifier has dynamic consumption. As long as you don't put a sinewave on it and max the output power or drive it to full distortion, it can consume way below the max rated power.
On the other hand, pedals have more constant power consumption.
Specs are 10Ah 5V, I don't know about the ampere, this is a cheap powerbank so perhaps around 2A . I never thought about watts, now it makes more sense, I was taking Amps for granted, even then 10Ah 5v stands for 3.7volts 10Ah because the battery itself is not 5 volts so my 10Ah's are less than actuall 10Ah.
I managed to keep power supply running by paralleling 1600 uF cap to 5v out and turning DC output potentiometer slowly to 18volts. Doing this enabled me to power my 10 of 10 analog pedals that attached to power supply, however I was unable to power my digital delay together with other analogs. It's a thirsty pedal that requires 500mA.
For the Amplifier, yea that thing is capable running with 8x AA batteries, I think also being class D helps too, considering most amps are powered from outlets that made me puzzled
Perhaps my standarts are too high for a powerbank that meant to charge phones, guess I am back to my adapter then.
There may also be a problem with the inrush current with a lot of devices - the current spike caused by trying to charge all the capacitors in all the pedals might prompt an over-current shutdown in the powerbank?
If that is the case, I found that I could prevent this from happening by creating a Soft Start Circuit. However, this doesn't solve my second problem: the power bank is unable to supply the required 18V DC at 1A for my power supply. I guess that's just the nature of my powerbank. It may support 9V at 1A which is enough to run my pedals, but that would require a new connection port for 11 devices, since my power supply only accept an 18V DC input.