The fruttenboel DIY DSO
As a result of a discussion on the Global WISclub mailinglist (see navigator) I restarted this stalled project of mine. It is a geekport project. Let's start using these 4 GHz PC's again for taking two samples per second! We have cycles to burn! They don't release carbonic oxides, so our truth is convenient!
The aim of this project is to construct thingies that can be made without the need to burn a program into a special thingy. Just COTS circuits that you can buy around the corner (or sample on the web) and that will be connected to a peripheral of a standard PC.
On the right, you see a populated PCB based on the first run of PCB's made by a big boardmaker. Preliminary tests have not revealed any errors yet. That's a good sign!
Below are the topics covered in this section. The topics are mentioned in chronological order: newest edition is further down the page. I think that makes easier reading.
The picoSam 32 is based on versions 1 and 2. It uses the LM 08032 ADC and it is isolated from the computer via
opto couplers. These are cheap ADC chips and cheap opto couplers. The power supply is a split supply for
computer side and real world side.
A double sided PCB had been created. Perhaps I will have PCB's made in China. This is intended to be a nice low speed scope or a moderate speed data logger.
The picoSam 2 is also based on the ADC of type 0832 (available from many sources, among which are National
Semi and Texas Instruments). TI allows you to sample the DIP devices!
The 'picoSam 2' is picoSam 1 with an opto coupler interface and split power supply. It was to be connected to the parallel port. Project abandoned. Read about the why in the corresponding section. You can learn from my mistakes
The picoSam 1 is based on the ADC of type 0832 (available from many sources, among which are National Semi and
Texas Instruments). TI allows you to sample the DIP devices!
The 'picoSam 1' is a two channel 8 bit Analog to Digital Converter with a serial interface. It will be connected to the parallel port.
LPT port basics
What are the bits of the LPT port interface? Which bits are inverted? How can I find the base address? Read the answers in this section.
Page created 1 April 2007,
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