Hey Guys -
I've got a basic project which lights 32 LEDs which are set up in series of 4 all in parallel as shown below. As each LED is 3V / 20ma, I didn't add in resistors or anything to each series.
Unfortunately, I've twice now run into an issue (thermal runaway?) where the LEDs are only running at about 25% brightness when set at 100%. The first time this occurred, I found with the multimeter that each series is getting 3V instead of 12V. Sometimes a series flickers, too. When I replace the series, everything goes back to normal for a brief period.
How can I remedy this to where it won't be an issue in the future after the next repair?
Ignore typo saying x24 LEDs in diagram - its x32