I am planning on building the Preamp for Soundcard shown at http://www.learningelectronics.net/circuits/preamplifier-for-soundcard.html (parts ordered) to use with my Xonar DGX. I want to be able to plug an electric guitar into my sound card as well as use spectrum analysis software. (I know there are products available that already do this.) I drew the schematic in LTspice IV and am not getting the output I was expecting. I'm newb enough that the problem could be anything, including my expectations for the output. I am expecting the output wave to look the same as the input wave, except with a greater amplitude, and no added bias.
I did some new things with LTspice that I haven't done before:
(1) I got .MODELs off the internet of the two transistors used.
(2) The default capacitor it draws is not polar, so I randomly selected an electrolytic from the ones included with LTspice by default, then changed the capacitance value.
(I also got a model and .asy for a potentiometer off the Internet, but got an untraceable error, so I deleted it and put in two resistors instead.)
I triple-checked the schematic, the parameters for my voltage sources, and the simulation parameters, but haven't seen any errors. Can anyone suggest what I might have missed about getting this model into LTspice correctly or something I haven't realized about the circuit design? I have attached snapshots of the schematic, the input+output graph, and the LTspice file itself.
I did some new things with LTspice that I haven't done before:
(1) I got .MODELs off the internet of the two transistors used.
(2) The default capacitor it draws is not polar, so I randomly selected an electrolytic from the ones included with LTspice by default, then changed the capacitance value.
(I also got a model and .asy for a potentiometer off the Internet, but got an untraceable error, so I deleted it and put in two resistors instead.)
I triple-checked the schematic, the parameters for my voltage sources, and the simulation parameters, but haven't seen any errors. Can anyone suggest what I might have missed about getting this model into LTspice correctly or something I haven't realized about the circuit design? I have attached snapshots of the schematic, the input+output graph, and the LTspice file itself.
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