#1 Head Scratching?
Posted: Mon Sep 19, 2022 3:59 pm
I'm having to troubleshoot a DSD DAC project and it seems there is a problem with the BC557 transistors that are supposed to drive the mute switching. I started to dig a bit deeper and it seems that TO92 package BC557 transistors are available with two completely opposite pin-outs, as per datasheets below;
https://datasheetspdf.com/pdf-file/1396 ... mp/BC557/1
https://www.onsemi.com/pdf/datasheet/bc556bta-d.pdf
Is this common?
At the moment, having transistors essentially mounted the wrong way round is my best guess for the problem I've encountered.
https://datasheetspdf.com/pdf-file/1396 ... mp/BC557/1
https://www.onsemi.com/pdf/datasheet/bc556bta-d.pdf
Is this common?
At the moment, having transistors essentially mounted the wrong way round is my best guess for the problem I've encountered.