Voltage divider for radio

[CrankyCoder]

Does anyone know if it's possible to use some resistors to knock back the 5v to 3.3v? I have some voltage regs coming, but you know how getting from china is. Wondering if it's safe to do this till my regulators show up.

Thanks!

[Koresh]

It's possible. But you must use small resistors because your "power source" should have relatively small output impedance. As a result you will warm up our planet a lot :) Maximum consumption of the radio is 100mA. So I recommend using at least 10/6.6 ohm (1-2W) divider as "reliable" power source. :smirk:

[CrankyCoder]

ok. Just wanted to see if it would be a problem till my regulators show up. thank you!

[AWI]

@Jason-Brunk small value resistors can do the trick but you better try two silicon diodes 1N4001 or similar in series with the power line. Each diode give you around.0.7 volt drop.