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Impedance matching

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Gordon Anderson

Joined: 16 Apr 2012
Posts: 41
Location: Switzerland

Posted: Wed Jun 01, 2016 8:49 am Post subject: Impedance matching

Hi all,



I am trying to hook up audio outputs from a Garrecht TRX-1500 (3Vpp, 8 Ohm) and Dynon Skyview (10V, 50 Ohm, output volume controllable by software setting) into a PMA5000EX (510 Ohm, max 3Vpp input or "damage will occur"). 



Partial feedback from suppliers is confusing - according to PSE / ACS the Skyview should be OK if I hook it up directly (despite potentially much higher output voltage than the audio panel accepts), but the TRX-1500 is allegedly problematic despite the relatively low output voltage. 



I am tending towards fitting a 470 Ohm trim pot across each output as a voltage divider using the wiper as input for the audio panel, more or less as proposed by Garrecht for a line level input.  



Can anyone tell me if I am on the right or wrong track?



Gordon Anderson

Switzerland, Van's RV-10 - 41015

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