Bruel and Kjaer type 2803 Dual Microphone Power Supply Service Manual - diyAudio
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Old 29th April 2012, 05:13 PM   #1
diyAudio Member
Join Date: Apr 2012
Default Bruel and Kjaer type 2803 Dual Microphone Power Supply Service Manual

Good day,

I'm trying to troubleshoot the hum I'm getting on my mic signal. I think I've tracked it down to the B&K type 2803 power supply unit, specifically the 28V supply to the preamp.

Using a scope, I'm getting a 100 Hz saw tooth ripply superimposed on the dc offset.

Im not too amped to fool around with the device without a service manual / circuit diagram, and the power supply was donated to the lab back in the 70s sans service manual.

I'm wondering if anyone has the service manual for the Type 2803 power supply that they could send me?

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