Uploaded December 2024 | Updated September 2026, 1 week ago
Only $5 for 10 PCBs and every new member get $5 bonus. + Express 24 hour / 48 hour service on pcbway.com ➠ ➠ ➠ In this video, I showcase my custom-designed 50Ω digitally controlled stepped attenuator, perfect for RF radio work. With 3dB steps up to 93dB of attenuation, this precision tool uses a combination of pi attenuator resistors, relays, an Arduino Nano, a rotary encoder, and a vibrant OLED display. It also features an integrated IEC dummy antenna circuit, ideal for simulating antenna signals during RF alignments.
Key features include:
• Stepped Attenuation: Achieve precise attenuation from 0dB to 93dB in 3dB steps.
• User-Friendly Controls: Simple rotary encoder interface with an OLED display for real-time feedback.
• 50Ω Impedance Matching: Ensures accurate RF performance.
• Dummy Antenna Circuit: Switchable for RF alignment tasks.
I’ve provided everything you need to build your own, including:
✅ Gerber files
✅ Schematic
✅ Bill of Materials (BOM)
✅ 3D print files for a custom enclosure
✅ Arduino Sketch Code
Want to build it? Order the two PCBs directly from PCBWay using the links below. Plus, I’ll be offering pre-programmed Arduino Nano modules at cost for those interested.
🎥 Watch now and bring this project to life!
🔗 Google Drive Folder: drive.google.com/drive/folders/1PV1SY4eCkOfOLt00cmZrMohOg8gdraSR?usp=sharing
🔗PCBWay Shared Relay Board: pcbway.com/project/shareproject/Digital_Switched_Attenuator_Relay_Board_f4e2e8ce.html
🔗PCBWay Shared Control Board: pcbway.com/project/shareproject/Digital_Switched_Attenuator_Control_Board_4181cead.html
🎥 Other videos mentioned in this video:
■ Arduino Meets Tube Radios: Building a Switched Pi Attenuator (0-93dB) For Alignments - youtu.be/71RxyF2FU_s
■ Switchable Pi Attenuator with Dummy Antenna - youtu.be/3omksRXF7Sc
Like, share, and subscribe for more RF and electronics projects!
🙏 Want to support the channel? ●●●●●●
patreon.com/mcaldeira
paypal.me/macaldeira
#RFProjects #ArduinoDIY #electronicstutorial
●●●● HUNDREDS OF OTHER VIDEOS TO CHOOSE FROM ●●●●
✿ DIY TEST GEAR: The title says it all:
youtube.com/watch?v=7buNHf6HoDw&list=PLy5M_tA9ux7KkjmWX0I0zNocg6NF33EfL
✿ RESTORATION BUILDING BLOCKS: A series of videos showing detailed steps used the restoration process of tube equipment:
youtube.com/watch?v=7xvTGd4ysRE&list=PLy5M_tA9ux7JSYx8z2mw303vx287LHpzf
✿ HowTo's: Various videos on some simple techniques and projects:
youtube.com/watch?v=lgr-J_D6pSU&list=PLy5M_tA9ux7K3B77iUGyLPai3RIvJOrkO
✿ DIY CAPACITOR LEAKAGE TESTER PROJECT: One of the most viewed projects on my channel, with full design description and build instructions.
youtube.com/watch?v=0pySErvzUIY&list=PLy5M_tA9ux7KWexvEjLB0SANSxQXi0zTS
✿ DIY TUBE TESTER PROJECT: Complete design description and build instructions for this really handy device.
youtu.be/3fCE4uaw_cU?si=BhCnTKKN2NQUDe6v
●●●● Plus full Playlists on some other completed restoration projects on this Channel ●●●●
📻 PHILIPS BX750A:
youtube.com/watch?v=i8U9Lteja5o&list=PLy5M_tA9ux7IG6XgctidGO0u0DeT3_CxF
📻 TELEFUNKEN OPUS 2114:
youtube.com/watch?v=_HO2bjY5vuw&list=PLy5M_tA9ux7LhcZ9h9plfTFmjaM1mcifu
📻 SABA UW-175-Z 3D:
youtube.com/watch?v=cca4i60ZLw4&list=PLy5M_tA9ux7IWL18nsrSf4RnjsuPjHC-p
📻 GRUNDIG 1070:
youtube.com/watch?v=i4J5l0fwhko&list=PLy5M_tA9ux7JgnyYPRWOK763aJ8bg3iCI
📻 SCHAUB-LORENZ GOLDY 58 type 3020:
youtube.com/watch?v=RSbt7qVed78&list=PLy5M_tA9ux7IBse5G--Kl89SPS9sATXfZ
📻 BUSH VHF64:
youtube.com/watch?v=U--6JymkQ1M&list=PLy5M_tA9ux7KsvN5M48cX6cxN4jSz0s3X
📻 GRUNDIG 3060A:
youtube.com/watch?v=7x2sK2GSYeE&list=PLy5M_tA9ux7L8e9h8lrHGREPqcgWO-YQm
📻 TELEFUNKEN OPERETTE 8:
youtube.com/watch?v=5IsACM0mPzs&list=PLy5M_tA9ux7K3SXDv8Hu4uAyl1O7NE5dc
📻 GRAETZ SUPER 171W:
youtube.com/watch?v=MhG-CH0gqm4&list=PLy5M_tA9ux7IjUykGE8neJSI6GUxMl2YG
📻 LOEWE-OPTA MAGNET 3737W:
youtube.com/watch?v=ZSZBJ5sKQm8&list=PLy5M_tA9ux7J_hzDhnF8rs2c7wmgGfRlK
📻 BRAUN ATELIER 3:
youtube.com/playlist?list=PLy5M_tA9ux7L3k5nPRvrk1aH764QRCTqE
📻 LOEWE-OPTA TRUXA STEREO 4741W:
youtube.com/playlist?list=PLy5M_tA9ux7KhVk0KqPx0Wkh2KO_5f2fQ
📻 GRAETZ COMEDIA 616:
youtube.com/watch?v=fwmW9k3TwNE&list=PLy5M_tA9ux7L5sAApLzV6xoYzmRNJpMW5
📻 SABA FREIBURG W2:
youtube.com/playlist?list=PLy5M_tA9ux7IqvS-LshUGpE1D_WY6mrZe
📻 GRAETZ MUSICA 4R417:
youtube.com/playlist?list=PLy5M_tA9ux7Ios98E59dWjwc2SRJyxwIn
Only $5 for 10 PCBs and every new member get $5 bonus. + Express 24 hour / 48 hour service on pcbway.com ➠ ➠ ➠ In this video, I showcase my custom-designed 50Ω digitally controlled stepped attenuator, perfect for RF radio work. With 3dB steps up to 93dB of attenuation, this precision tool uses a combination of pi attenuator resistors, relays, an Arduino Nano, a rotary encoder, and a vibrant OLED display. It also features an integrated IEC dummy antenna circuit, ideal for simulating antenna signals during RF alignments.
Key features include:
• Stepped Attenuation: Achieve precise attenuation from 0dB to 93dB in 3dB steps.
• User-Friendly Controls: Simple rotary encoder interface with an OLED display for real-time feedback.
• 50Ω Impedance Matching: Ensures accurate RF performance.
• Dummy Antenna Circuit: Switchable for RF alignment tasks.
I’ve provided everything you need to build your own, including:
✅ Gerber files
✅ Schematic
✅ Bill of Materials (BOM)
✅ 3D print files for a custom enclosure
✅ Arduino Sketch Code
Want to build it? Order the two PCBs directly from PCBWay using the links below. Plus, I’ll be offering pre-programmed Arduino Nano modules at cost for those interested.
🎥 Watch now and bring this project to life!
🔗 Google Drive Folder: drive.google.com/drive/folders/1PV1SY4eCkOfOLt00cmZrMohOg8gdraSR?usp=sharing
🔗PCBWay Shared Relay Board: pcbway.com/project/shareproject/Digital_Switched_Attenuator_Relay_Board_f4e2e8ce.html
🔗PCBWay Shared Control Board: pcbway.com/project/shareproject/Digital_Switched_Attenuator_Control_Board_4181cead.html
🎥 Other videos mentioned in this video:
■ Arduino Meets Tube Radios: Building a Switched Pi Attenuator (0-93dB) For Alignments - youtu.be/71RxyF2FU_s
■ Switchable Pi Attenuator with Dummy Antenna - youtu.be/3omksRXF7Sc
Like, share, and subscribe for more RF and electronics projects!
🙏 Want to support the channel? ●●●●●●
patreon.com/mcaldeira
paypal.me/macaldeira
#RFProjects #ArduinoDIY #electronicstutorial
●●●● HUNDREDS OF OTHER VIDEOS TO CHOOSE FROM ●●●●
✿ DIY TEST GEAR: The title says it all:
youtube.com/watch?v=7buNHf6HoDw&list=PLy5M_tA9ux7KkjmWX0I0zNocg6NF33EfL
✿ RESTORATION BUILDING BLOCKS: A series of videos showing detailed steps used the restoration process of tube equipment:
youtube.com/watch?v=7xvTGd4ysRE&list=PLy5M_tA9ux7JSYx8z2mw303vx287LHpzf
✿ HowTo's: Various videos on some simple techniques and projects:
youtube.com/watch?v=lgr-J_D6pSU&list=PLy5M_tA9ux7K3B77iUGyLPai3RIvJOrkO
✿ DIY CAPACITOR LEAKAGE TESTER PROJECT: One of the most viewed projects on my channel, with full design description and build instructions.
youtube.com/watch?v=0pySErvzUIY&list=PLy5M_tA9ux7KWexvEjLB0SANSxQXi0zTS
✿ DIY TUBE TESTER PROJECT: Complete design description and build instructions for this really handy device.
youtu.be/3fCE4uaw_cU?si=BhCnTKKN2NQUDe6v
●●●● Plus full Playlists on some other completed restoration projects on this Channel ●●●●
📻 PHILIPS BX750A:
youtube.com/watch?v=i8U9Lteja5o&list=PLy5M_tA9ux7IG6XgctidGO0u0DeT3_CxF
📻 TELEFUNKEN OPUS 2114:
youtube.com/watch?v=_HO2bjY5vuw&list=PLy5M_tA9ux7LhcZ9h9plfTFmjaM1mcifu
📻 SABA UW-175-Z 3D:
youtube.com/watch?v=cca4i60ZLw4&list=PLy5M_tA9ux7IWL18nsrSf4RnjsuPjHC-p
📻 GRUNDIG 1070:
youtube.com/watch?v=i4J5l0fwhko&list=PLy5M_tA9ux7JgnyYPRWOK763aJ8bg3iCI
📻 SCHAUB-LORENZ GOLDY 58 type 3020:
youtube.com/watch?v=RSbt7qVed78&list=PLy5M_tA9ux7IBse5G--Kl89SPS9sATXfZ
📻 BUSH VHF64:
youtube.com/watch?v=U--6JymkQ1M&list=PLy5M_tA9ux7KsvN5M48cX6cxN4jSz0s3X
📻 GRUNDIG 3060A:
youtube.com/watch?v=7x2sK2GSYeE&list=PLy5M_tA9ux7L8e9h8lrHGREPqcgWO-YQm
📻 TELEFUNKEN OPERETTE 8:
youtube.com/watch?v=5IsACM0mPzs&list=PLy5M_tA9ux7K3SXDv8Hu4uAyl1O7NE5dc
📻 GRAETZ SUPER 171W:
youtube.com/watch?v=MhG-CH0gqm4&list=PLy5M_tA9ux7IjUykGE8neJSI6GUxMl2YG
📻 LOEWE-OPTA MAGNET 3737W:
youtube.com/watch?v=ZSZBJ5sKQm8&list=PLy5M_tA9ux7J_hzDhnF8rs2c7wmgGfRlK
📻 BRAUN ATELIER 3:
youtube.com/playlist?list=PLy5M_tA9ux7L3k5nPRvrk1aH764QRCTqE
📻 LOEWE-OPTA TRUXA STEREO 4741W:
youtube.com/playlist?list=PLy5M_tA9ux7KhVk0KqPx0Wkh2KO_5f2fQ
📻 GRAETZ COMEDIA 616:
youtube.com/watch?v=fwmW9k3TwNE&list=PLy5M_tA9ux7L5sAApLzV6xoYzmRNJpMW5
📻 SABA FREIBURG W2:
youtube.com/playlist?list=PLy5M_tA9ux7IqvS-LshUGpE1D_WY6mrZe
📻 GRAETZ MUSICA 4R417:
youtube.com/playlist?list=PLy5M_tA9ux7Ios98E59dWjwc2SRJyxwIn
