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DIY GPIO EAS Switching Relay

Parts List Open Broadcaster EAS Relay

Kit with diagram and assembly photos of a complete RS232 GPIO Switching Relay . Special Thanks to Pippin Technical supplier of parts in a kit form if that has any appeal for around $150 or the completed switching relay. Full assembly takes 2 +/- hours for all mounting, cable prep, soldering and testing with the OB Alert Player. Might take a bit longer for groups that have never built one before. Get a group together for a DIY maker space hands on training project.

Bill of Materials

Item Description Quantity Item No.
Broadcast Tools LR-5 latching relay 1 LR-5
Hammond Box ABS GRAY 6.58”L X 4.21”W 1 HM225-ND
Neutrik 3 Pin Nickel Male Inline XLR 2 NC3MX
Neutrik 3 Pin Nickel Female Inline XLR 4 NC3FX
DB15(F) Connector and Shell 1 Shop Supplies
Semiconductor, Wiring and dressing 1 Shop Supplies

Full assembly takes 2 +/- hours for all mounting, cable prep, soldering and testing with the OB Alert Player. Might take a bit longer for groups that have never built electronics projects before.

 Internal View Switching Relay

 Completed Switching Relay

DIY Hall of Fame

Switching Relay

Dave Currie of Faith FM Waterloo Ontario made this really professional EAS setup using a Intel NUC and a custom relay. Nice work Dave!

Front and Rear View Ver 1

Audio Connections Ver 1

20 Db Annenuation

Why bother buying a 15.00 inline adaptor when you can make it yourself with a few parts and a soldering iron.

‘H’ or ‘T’ pads may also be fabricated to accomplish the same level of attenuation.For a balanced signal, use an H-Pad: input_impedance=30k Ω, output_impedance=10k Ω. The example below provides approximately -20dB of attenuation using resistors R 1/2= 12k Ω; R 2=3.3k Ω; R 3/2=3.3k Ω (ground wires should also be connected).

DIY Hpad Attenuators

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