Hi guys,
I have a problem which seems like it shouldn't be too hard to figure out, but when I searched on the internet for advice, no one else on the internet seems to be doing quite the same thing.
I made 3 of this simple 555 timer-based circuit, each of which controls a few LEDs: http://www.555-timer-circuits.com/up-down-fading-led.html. Each of them works great on its own when connected to its own 9V battery. Since they are all going to be inside the same object, I thought it would make the most sense to use an AC adapter to power all of them simultaneously. I am pretty sure I could do it easily using 3 jacks and a guitar-pedal-powering daisy chain setup, but I want to just have one jack.
At first this seemed like a no-brainer. The adapter I was using is a 9V adapter with 1 amp of current (I do not know the current draw of each of the circuits, but I know that 3 circuits that run well with 250 mA each should run OK on 1 amp). What I did was make "rails" from the + and ground of the jack and then put each of the circuits along them parallel to each other, connecting each to the appropriate rails using the same wires that had connected it to the + and - of the battery originally.
When connected to the adapter with this jack, the LEDs in the circuits all light up and flash, but they do so erratically. It sort of seems like they are modulating each other - as in, the rate I set each circuit to flash at using the pot in the circuit affects the rate at which the others flash, and the flashes of each speed up and slow down unpredictably.
What did I do wrong? What is the right way to do this? Is there any way to do this with the adapter I am already using, and just 1 jack?
Thanks!
AS
I have a problem which seems like it shouldn't be too hard to figure out, but when I searched on the internet for advice, no one else on the internet seems to be doing quite the same thing.
I made 3 of this simple 555 timer-based circuit, each of which controls a few LEDs: http://www.555-timer-circuits.com/up-down-fading-led.html. Each of them works great on its own when connected to its own 9V battery. Since they are all going to be inside the same object, I thought it would make the most sense to use an AC adapter to power all of them simultaneously. I am pretty sure I could do it easily using 3 jacks and a guitar-pedal-powering daisy chain setup, but I want to just have one jack.
At first this seemed like a no-brainer. The adapter I was using is a 9V adapter with 1 amp of current (I do not know the current draw of each of the circuits, but I know that 3 circuits that run well with 250 mA each should run OK on 1 amp). What I did was make "rails" from the + and ground of the jack and then put each of the circuits along them parallel to each other, connecting each to the appropriate rails using the same wires that had connected it to the + and - of the battery originally.
When connected to the adapter with this jack, the LEDs in the circuits all light up and flash, but they do so erratically. It sort of seems like they are modulating each other - as in, the rate I set each circuit to flash at using the pot in the circuit affects the rate at which the others flash, and the flashes of each speed up and slow down unpredictably.
What did I do wrong? What is the right way to do this? Is there any way to do this with the adapter I am already using, and just 1 jack?
Thanks!
AS