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  • DPScope - Build Your Own USB/PC-Based Oscilloscope

    If your requirements for waveform fidelity are moderate you could replace it with a fixed ceramic capacitor. You may have to try with a couple values to find the right one. Should be around 18pF, so you may want to get 16pF, 18pF, 20pF and 22pF. Decide by doing the calibration procedure, only replacing the fixed caps instead of trimming the trimmer capacitor. No need to solder each one in place during the tryout, pressing it into the via holes should be sufficient.

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  • DPScope SE - the Simplest Real Oscilloscope/logic Analyzer on the Planet

    Because the capacitive divider is only affecting the AC component of the signal (it has infinite resistance for DC), it does not matter to which DC potential (GND or 2.5V) it is connected to.

    Sorry but I am not familiar with Arduino programming (and the Atmel AVR microcontrollers they are based on) - I use bare Microchip PIC for my projects.

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  • DPScope - Build Your Own USB/PC-Based Oscilloscope

    I am sorry but I do not have any experience on the Arduino - my scopes use a "bare" Microchip PIC and dsPIC microcontrollers, while the Arduino is based on an Atmel microcontroller, so even a completely different architecture. There is an Arduino based oscilloscope project on Instructables though, you may want to search for that one.

    I am sorry but I do not have any experience on the Arduino - my scopes use "bare" Microchip PIC and dsPIC microcontrollers, while the Arduino is based on an Atmel microcontroller, so even a completely different architecture. There is an Arduino based oscilloscope project on Instructables though, you may want to search for that one.

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  • Electronic Heart (Flashing LEDs) - Mother's Day Project

    as far as construction soldering iron, solder, wire cutter,electric drill, screwdriver. If you mean software tools, you need the Picaxe logicator and the Picaxe download cable (see www.picaxe.com for details).

    you need the Picaxe logicator and the Picaxe download cable (see www.picaxe.com for details).

    as far as construction soldering iron, solder, wire cutter,electric drill, screwdriver. If you mean software tools, you need the Picaxe programmin editor and the Picaxe download cable (see www.picaxe.com for details).

    The schematic shows most of it. Apart from the Picaxe microcontroller (details on www.picaxe.com), all other parts are generic components which many hobbyists will find in their drawers. Same goes for the enclosure, I just took a suitable one from my stock of parts.

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  • DPScope SE - the Simplest Real Oscilloscope/logic Analyzer on the Planet

    No X-Y mode in the current version of software, and not likely that I will add this feature in the near future.

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  • DPScope - Build Your Own USB/PC-Based Oscilloscope

    First, the voltage into the buffer opamp is limited by the calmping diode to between 0V and 5V (actually, maximum one diode drop below/above thos values). The output of the buffer opamp can conly swing rail to rail, i.e. will never go beyond 0V and 5V, so the following device input (of the PGA) will never see values outside that range. The 10x gain is only true if the input to the 10x stage is small enough, larger values get clipped.

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