I'm just catching up with emails after being away for a week - hope this is still relevant. I purchased one of the early DSOnano units last year and use occasionally. It actually works quite well and I'm happy with the purchase. I purchased from for US $79 including shipping. There are a few 'gotchas' with my unit. 1) there is NO proper charge control for the LiPo battery. Charger consists of a single silicon diode in series with a resistor fed from the USB +5V rail. Surprisingly, the battery still lives after several dozen charge cycles but I really do expect a short battery lifetime= .. I've never run the battery dead flat (and take great care not to do so) which probably explains why the battery still works. But Seeed Studio ships the unit with the battery not installed (smart) and provides a large piece of transfer adhesive (gummy-back) for you to use to install the back cover. Because I think the battery is going to have a short lifetime, I used only a fraction of the supplied adhesive strip to anchor just the sides of the back panel to make it easy to remove when necessary. 2) the trigger functionality seems funky. I think that's because they don't have a hardware trigger circuit but instead rely upon software sampling the ADC input. I'm currently running last year's "Paul" firmware but I understand that there is more recent firmware available. I hope to check it out soon. I also purchased (as a 'pre-buy') their DSOquad and just received notification that it has shipped. Purchase price was US $159 and it looks to be like a darned reasonable unit - on paper, anyway. I'll find out when I get it. Its quite funny. For the longest time, the only DSO I had was the Tek THS720P handheld two channel unit I purchased when I was (briefly) rich. Its a true 1G samples per second per channel unit with an analog bandwidth of 100 MHz. It has served me well for more than a decade now and still works well. Bob Blick's screen capture software allowed that scope to help make doing documentation easy. But I've been on a bit of a buying spree over the past couple of years. I purchased a couple of used Tek 400MHz analog scopes (expensive but VERY nice), including one that has the image intensifier CRT (2467B). The 2465B replaced my very tired Tek 465 on my bench and gets used a LOT. Then I came across what looked like a dream come true: a 4-channel 200MHz (1 Gsps each channel) DSO from a company called Welec. I was familiar with them in their previous incarnation Witting Electronics (sic?) who had made the cute scope pen sold by Radio Shack and others (ozziFOX?). The Welec scope actually works sort of OK at low frequencies but the analog front end is completely incompetent and is not even vaguely accurate at frequencies higher than 100MHz or so. The firmware is buggy and incomplete. However, there are at least two teams of developers currently working on turning the scope into something reasonable= .. Then I purchased the DSOnano because it was so small and easy to fit into my laptop bag. It gets used regularly when I'm on site or messing around at home. My next purchase (late last winter) was a Rigol DS1052e from Deal Extreme - 2 channels, 50 MHz. Quite frankly, the main reason I purchased it was because of the on-going hacks going on over at EEVblog where people have figured out how to turn it into a bona-fide 100 MHz scope. It turns out that the circuit board and all of the components on the board are identical between Rigol's 50MHZ and 100MHz scopes. The only difference appears to be the model number. And its the model number that determines the bandwidth! Rigol uses a varactor diode in the analog front end for bandwidth limiting (the 20 MHz low-pass filter). If the scope thinks that its the 50MHz version, they bias the varactor so as to form a 50 MHz low-pass filter. When you edit the model number string in the internal eeprom, that bias goes away and the scope functions as a 100MHz scope. I haven't done the eeprom change yet, though. Just no time to do it. I've been using the Rigol scope a lot over the past couple of months and really like the unit. Its fast, responsive (unlike the Tek THS720P) and has features that I find really useful. Its now my portable high-speed scope of choice whenever I need one on site, unless I think that I might need the isolated channels that the Tek THS720P gives me. Then I spotted something else so cute that I just couldn't resist. I am awaiting the arrival of my 3 units of Gabotronics Xprotolab 1" DSO / logic analyzer units to arrive. I have a strong suspicion that I might consider installing those units inside one or more of our higher-priced products to assist with field debugging when necessary. Sort of like the oscilloscope that Continental Electronics built into their 50KW AM Broadcast Transmitters that I grew up with three decades ago. The bang for the buck ($30 each when purchased 10 at a time) seems incredible. And now I'm waiting for my DSOquad to arrive. I do think that will be it for scope purchases for a while, though. dwayne At 08:19 PM 4/17/2011, RussellMc wrote: >More and less capable than the recently discussed PIC based unit. >Selling here new for around $US80 at auction. > > >http://www.trademe.co.nz/Electronics-photography/Other-electronics/Other/a= uction-366204432.htm > >"Real" attentuator on front end. > >SeeKe'ns comments and links below. > >They also sell a Humdinger kit. >Non-incremental wrt a turbine, as they claim, it may be. >"Makes lots of sense compared to a turbine" it may not. > > http://www.seeedstudio.com/depot/windcell-maker-kit-p-725.html?cPath= =3D155 > > > Russell > > >Date: 18 April 2011 13:23 >Subject: DSO Nano >To: Russell McMahon > > >Russell, > >This is a good example of what you can do with one of the new ARM Cortex-M= 3 >micros: > >http://www.seeedstudio.com/depot/dso-nano-v2-p-681.html?cPath=3D174 > >Single-channel DSO with 320x240 colour LCD screen >10mV/div to 10V/div vertical input (x1 probe) >1MHz analog BW >Up to 1Msa/s with 12-bit resolution >4096 sample memory depth >10Hz - 1MHz squarewave signal output >USB interface >SD card for waveform storage >500mAh LiPO battery >Soft (upgradeable) firmware > >Source code and schematic available (it's an open source design) here: > >http://code.google.com/p/dsonano/ > >The company behind it is a rather interesting concept too. > > >To my surprise it appears to have a real input attenuator - so unlike oth= er >"tiny scope" designs it doesn't achieve it 1000:1 range of input sensitivi= ties >(10mV/div .. 10V/div for a x1 probe) by throwing away resolution on the lo= wer >ranges. > >There are three of these in Trademe at the moment (although the ones >on Trademe >may be the earlier model). I think the earlier version uses a different u= ser >interface and housing and came with a proper scope probe. As far as >I can tell >the new model just comes with EZ-hooks. > >I may have to buy one of these :-) > >Regards, > >Ken Mardle > >-- >http://www.piclist.com PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist > >__________ Information from ESET NOD32 Antivirus, version of virus >signature database 6053 (20110418) __________ > >The message was checked by ESET NOD32 Antivirus. > >http://www.eset.com -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .