Hello all, as I learned in a previous post, I had burned out the voltage regulator on my deicimila. I'd like to replace it, but nobody in town has an MC33269D as indicated in the arduino schematic. Is it possible to use any +5V regulator, like, say, the 7805?
Thanks!
!c
The MC33269D is a low drop-out regulator, meaning it can give you a stable 5V on a lower voltage than the 7805. If your input voltage is high enough, the 7805 should do the job. Make sure you read the datasheets for both devices. Check the pinouts, and get a 7805 with a high enough current rating. I believe the MC33269D is 800mA. I'd got for at least as high on the replacement.
Make sure the pinouts match - other than that, it shouldn't really matter as long as Vin is above the dropout voltage and the diode drop. My NG has a 7805, as do many of the arduino-derived circuits I have.
-j
Cool, I should be good then. The 7805 is rated @ 1A & 35V, and my input will be 12V.
Thanks again!
!c
In some cases there is a darned good reason NOT to use an LDO. The MC33269D has a maximum input voltage of 20V. On the LEDuino we used a 78M05 because of the 35V input rating in an environment where inputs over 20V are likely.
The Geek.
In some cases there is a darned good reason NOT to use an LDO. The MC33269D has a maximum input voltage of 20V. On the LEDuino we used a 78M05 because of the 35V input rating in an environment where inputs over 20V are likely.
I'm sure there are times when you have to do that, but I still cringe at the wastefulness of dissipating over 20 volts with a 5 volt linear regulator. It really doesn't matter much though if your controller is just a few mA and you're controlling amps of 30 volt motors.