Arduino-based Switch to power-up LNA

Hi Maker Community,

I need to power up and power down a RF LNA (Low Noise Amplifier), however I need to do this remotely. So far I know I’ll probably need an Arduino Uno, 12V Relay Module and a ESP8266 or some type of Wi-Fi module to send commands and determine the current switch connection of the relay.

My goal is to remotely control the switch through maybe an Arduino with Wifi, so that when I want it to power up, the LNA will be connected to the power supply, and it will power-down when the LNA is connected to the GND (Ground).

Power Specifications of the LNA
Supply Voltage: 12 to 15 V
Current Consumption: 400mA
Power-up Time = 300 microseconds

Here’s is a rough layout of the LNA, Power Supply and SPDT (single pull double throw) Switch

Any help or advice would be greatly appreciated


Any of the ESP series, right down to a ESP01/ESP01S would do this job for much less than the cost of an Arduino. Code to switch a relay from your mobile phone is available. You can even get a complete module with relay.


Hi Charith,

Along the same lines as Jeffs suggestion, you could go for something plug and play through the Adafruit Feather boards

Adafruit has some excellent guides to back the Feather boards.
I’d be keen to see more about this one! It’s been a while since I’ve seen OP-amps in projects :smiley:



Thanks Jeff, I’ll take on board what you mentioned see how I progress

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Sweet thank you Liam, and cheers for the links you provided :slight_smile: