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R-2R attenuator PCB layout question
R-2R attenuator PCB layout question
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Old 9th July 2018, 02:28 PM   #101
OlegSh is offline OlegSh
diyAudio Member
 
Join Date: Dec 2010
Location: Germany
R-2R attenuator PCB layout question
I think yes, we need external diodes across the relay power pins. It makes the loop created by back EMF current much smaller which helps avoiding clicks during relay switching. I use diodes with Vf significantly smaller than 0.6V of the diodes built into the ULN2803A. In addition using low Vf diodes can help keeping the relays closed for a bit longer helping to control ON/OFF timing difference (approaching make-before-break effect), which again helps to avoid pops and clicks when adjusting the volume. The last point does not apply to my later design since there the reverse is needed, longer switch ON and shorter release time to achieve the same effect.

Regards,
Oleg
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