I am building an astable 555 circuit that has a 9v power supply and 2 parallel LEDs. The issue that I’m running into is I need the LED lights to be off longer than they are on. My goal is to have them on for about 5-10 seconds and be off for about a minute. Is there any way to do that with this circuit or do I need to look elsewhere other than a 555?
This is one way to have different time constants for the capacitor's charge and discharge currents.
Red is the path of the charge current, green the discharge.
This is what a datasheet shows as an example as to how to use the device. I just changed Rb to the more complicated arrangement of the two diodes and two resistors
They've got a high-side load (which is what Mike was describing to you).
If you have 9V to work with, the two LEDs can go in series (along with a resistor) and it will help reduce the supply current (that might be what Mike is saying - not sure).
This is what a datasheet shows as an example as to how to use the device. I just changed Rb to the more complicated arrangement of the two diodes and two resistors
They've got a high-side load (which is what Mike was describing to you).
If you have 9V to work with, the two LEDs can go in series (along with a resistor) and it will help reduce the supply current (that might be what Mike is saying - not sure).
