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DACs / I am making a correction amp and have a question :)
« on: May 23, 2016, 03:04:09 pm »
Hello all. 
I just started building my own projector and want to make a soundcard DAC to control it. While i'm waiting for the soundcard to arrive i am making the correction amp for it. I have been looking at schematics and pictures of this and afaik they all seem to have individual offsets for each channel. I think this is due to the offset being affected by the gain.
My idea is to put a unity gain opamp in front of the amplifier and reference that to a single trimpot controlling the offset reference. This means less trimpots and should make it easier to adjust. Do you think this will work or am i missing something?
When i get this up and running and tested i will put up the schematics and PCB design for download. Maybe i will have some spare PCB's as well if anybody wants.
Thanks and keep it real
I just started building my own projector and want to make a soundcard DAC to control it. While i'm waiting for the soundcard to arrive i am making the correction amp for it. I have been looking at schematics and pictures of this and afaik they all seem to have individual offsets for each channel. I think this is due to the offset being affected by the gain.
My idea is to put a unity gain opamp in front of the amplifier and reference that to a single trimpot controlling the offset reference. This means less trimpots and should make it easier to adjust. Do you think this will work or am i missing something?
When i get this up and running and tested i will put up the schematics and PCB design for download. Maybe i will have some spare PCB's as well if anybody wants.
Thanks and keep it real