---------- > From: Stuart Barge > To: > Subject: Re: PC logic analizer > Date: August 27, 1999 9:14 AM > > Check out Circuit Cellar INK No 89 > Francis Deck designed and built one that runs on a PC and can sample at over > 20 MHZ. This seemed like a good project. > People interested in a PIC based Logic Analyzer and oscilloscope should also check out the design by Norman Jackson in Circuit Cellar last year or at http://www.bitscope.com/ Some of the features are: á Simultaneous Analog/Digital capture á 100MHz Analog Channel Bandwidth á 4 Analog In channels multiplexed - 2 Analog In via BNC buffered 1Meg - 2 Analog In signals via DB25 POD á 8 Digital Levels via DB25 POD á 50MS/s Capture rate Maximum á Two 32K x 8 deep capture buffers á Complex trigger on Analog or Digital á 1GHz Prescaler for Frequency Count á Low cost PIC 16F84 design á Logic functions in single PLD á Full Duplex serial interface á ãThin Server, Fat Clientä model á ASCII character Command Set á Output as CSV or Byte-Stream á POD has hooks for external device á ADC socket allows SMD devices á Scalable design to >100MS/s @ 3.3V á Chipset suitable for embedded DSO You can build as much as you want. The schematics are available for free along with the PCB layouts. They also sell board and chipset preprogrammed, all chips, fully assembled board and assembled board in case. I bought the fully assembled board in case for about $400 US. It is very nicely done and I have nothing but praise for this Australian group. I havent seen anything for this price range that can sample analog and digital at 25 Mhz. I dont have any connection with the peope at Bitscope Designs, but I am currently developing a GUI interface for this box to run under W95 and NT. It should be ready later this month. Gordon Williams