Manuel Caldeira

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Description

Digital Switched Attenuator - Relay Board

I designed and built a 50Ω digitally controlled stepped attenuator for RF work, offering 3dB steps up to 93dB of attenuation. The system uses relays controlled by an Arduino Nano, a rotary encoder, and an OLED display. This is one of two boards used; the second can be ordered via the link below. Watch the project video here: [Insert link].

/project/shareproject/Digital_Switched_Attenuator_Control_Board_4181cead.html

Schematic and Layout

Schematic

Schematic-Digital-Switched-attenuator_2024-12-12.pdf

Download Gerbers Download BOM(Bill of materials)

Dec 13,2024

783 views

Digital Switched Attenuator - Relay Board

2 Layers PCB 45.7 x 99.1 mm FR-4, 1.6 mm, 1, HASL with lead, Green Solder Mask, White silkscreen

A relay board to build a digitally controlled switched attenuator, 50Ω, allowing for attenuations in 3dB steps up to 93dB.

783

Published: Dec 13,2024

Standard PCB

Download Gerber file 5

BOM(Bill of materials)

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