Biasrocks
Well-known member
I just recently purchased a DAC for use with my outboard gear and my DAW.
It was designed to drive modest loads and seems to be working fine into modern inputs. When it comes to driving some real 600 ohm loads like my LA2A or 1176's it's loosing almost 10db of level into that load.
I've sketched the output section, and have modified the gain to get the levels up by putting around 2K in the feedback loop. Other than that, it's stock. The opamp is an OP275 and the power supply is +/-12v.
The datasheet indicates that it will drive 600 ohm loads out to 10V RMS, but it's definitely not coming close in this application.
http://www.analog.com/static/imported-files/data_sheets/OP275.pdf
Any ideas on how I can modify this to drive 600 ohm loads?
Mark
It was designed to drive modest loads and seems to be working fine into modern inputs. When it comes to driving some real 600 ohm loads like my LA2A or 1176's it's loosing almost 10db of level into that load.
I've sketched the output section, and have modified the gain to get the levels up by putting around 2K in the feedback loop. Other than that, it's stock. The opamp is an OP275 and the power supply is +/-12v.
The datasheet indicates that it will drive 600 ohm loads out to 10V RMS, but it's definitely not coming close in this application.
http://www.analog.com/static/imported-files/data_sheets/OP275.pdf
Any ideas on how I can modify this to drive 600 ohm loads?
Mark