Can weaning off adderall (dextroamphetamine and racemic amphetamine) cause depression symptoms?

Yes: When Adderall (dextroamphetamine and racemic amphetamine) is used for pure adhd there is usually not much withdrawal. But stimulants can transiently help mood but then cause a dependence like coccaine which leads to depression. This is why stimulants don't make good antidepressants by themselves and why they are classified as a potentially abused drug. Discuss with your prescriber and don't take other people's meds.