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Projects, Designs, and Technical Stuff / Re: Homebrew Lock-In Amplifier
« Last post by Picuino on Today at 11:53:07 am »Thank you for your advice.
I was also thinking about making a LIA with a digital processor, but I need first to have a reference analog LIA to check that the digital one works well as I program it.
I will make the preamp with 2 separate stages. One stage with 4 options (x1, x2, x5 and x10) and another stage that can have 2 options (x1 and x10) so I can choose many options between x1 and x100 with simpler knobs and it won't lower the bandwidth too much. If I need more amplification, it can be done with an external preamp.
Another advice I am missing is about the PCB routing, which is not shown in the tutorial and I think it can be important in such a sensitive instrument. How do I connect the grounds? Is a ground plane enough or do I have to wire all the lines to a single point with separate routes?
I was also thinking about making a LIA with a digital processor, but I need first to have a reference analog LIA to check that the digital one works well as I program it.
I will make the preamp with 2 separate stages. One stage with 4 options (x1, x2, x5 and x10) and another stage that can have 2 options (x1 and x10) so I can choose many options between x1 and x100 with simpler knobs and it won't lower the bandwidth too much. If I need more amplification, it can be done with an external preamp.
Another advice I am missing is about the PCB routing, which is not shown in the tutorial and I think it can be important in such a sensitive instrument. How do I connect the grounds? Is a ground plane enough or do I have to wire all the lines to a single point with separate routes?