I have two LM1117T through-hole low dropout regulators that I bought from two different sources. Both are labeled as the 3.3V variant.
I'm reading about 4.2 V across Gnd and Vin. One reads 3.27V on Vout, and when I hot-swap the other one instead, it reads 3.9V on Vout.
Is this just a case of bad quality components or could there be something else going on? There is no load on this test circuit, nor do I have any capacitors or anything else connected - just the +/- from my 4056 battery charger module going into Vin and Gnd on the LM1117T.
My goal is to power an ESP32 which needs regulated 3.3V. I'm using a 14500 3.7V Li-ion battery with the 4056.