Hi, i realy enjoy what you did with Arduino. But making a "poor mans's scope "can be done without it by just using one Input of your sound card. By doing so you should theorically (depend of the quality of your sound card) have at least 20Hz to 20KHz bandwidth which i admit is still a "poor man's scope but definitively a cheaper solution since the only hardware needed is the cables ...
An other possibility
Hi, i realy enjoy what you did with Arduino. But making a "poor mans's scope "can be done without it by just using one Input of your sound card. By doing so you should theorically (depend of the quality of your sound card) have at least 20Hz to 20KHz bandwidth which i admit is still a "poor man's scope but definitively a cheaper solution since the only hardware needed is the cables ...