LM317T voltage regulator power issue

[szakaria]

I want to power a wemos mini and an esp01 with 3.3V. I used the following setup :

the input voltage is DC 12V. R1 =200 ohm. R2=330 ohm. I get 3.3V as output (I measured it with a multi-meter). I tried to power an esp8266 wemos mini with this voltage (3.3V) but it failed. the LM317 became very hot. I tried to power an esp01 but still failed. I believe the setup doesn't output enough power to run the microcontrollers. The description of the LM317 says:

regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V.

I wonder if I missed something in the setup. Any help is appreciated.

[Railroader]

A TO220 cap can radiate 1 watt being naked. Just calculate the power lost in the 317. If it exceeds 1 watt, add a heatsink.
Where are the caps for input and output?

[DrDiettrich]

@szakaria

input voltage is DC 12V.

Then the regulator burns 12-3.3V = 8.7 times the current. Without a heat sink it may be at its limits with only 120mA.

[Wawa]

@szakaria

the LM317 became very hot.

The regulator dissipates "dropped voltage times current".
That's why we don't use linear regulators anymore if volt drop and current are high.
A switching buck supply is a much better choice here.
Leo..

[szakaria]

@Wawa

switching buck supply

Thank you All for your clarifications. I will use a Step Down Power Supply Module instead of the linear regulator.