Tag Archives: Homebrew

Inexpensive DIY Digital Oscilloscope Kit

I came across a DSO138 DIY Digital Oscilloscope Kit (SMD Soldered Version) on the Internet recently that looked like a fun project for the kids and me to work on together.  The price didn’t seem bad at $24 w/free shipping.  I ordered the optional clear acrylic case to go with it for another $7.50 more.

Basic specs (from the supplier site):

  • Maximum real-time sampling rate: 1Msps
  • Accuracy: 12Bit
  • Sampling buffer depth: 1024 bytes
  • Analog bandwidth: 0 – 200KHz
  • Vertical Sensitivity: 10mV / Div – 5V / Div (1-2-5 progressive manner)
  • Adjustable vertical displacement, and with instructions
  • Input impedance: 1MΩ
  • Maximum input voltage: 50Vpp (1: 1 probe), 400Vpp (10: 1 probe)
  • Coupling modes: DC / AC / GND
  • The horizontal time base range: 10μs / Div – 50s / Div (1-2-5 progressive manner)
  • With automatic, regular and one-shot mode, easy to capture the moment waveform
  • Available rising or falling-edge trigger
  • Adjustable trigger level position, and with instructions
  • Observable previous trigger waveform (negative delay)
  • Can freeze at any time waveform display (HOLD function)
  • Comes with a 1Hz /3.3V square wave test signal source

It came in the mail this weekend.  In the box was the case kit, bag of parts, main board, display board, test cable, assembly checklist, and a basic how to use guide:

Oscilloscope Kit

Oscilloscope Kit Oscilloscope Kit

Oscilloscope Kit Oscilloscope Kit

Oscilloscope Kit Oscilloscope Kit

Oscilloscope Kit Oscilloscope Kit

I plan to post updates on the build experience with photos along the way.  Stay tuned!

Wayne,  AG1A

 

3D Printing for Fun and Homebrewing

I recently picked up a mini 3D printer made by M3D.com because I wanted to channel my inner-maker and see what it was like to dabble in 3D printing, but I didn’t want to spend the $1k-$2k or more for trying out something that I might not like.

This particular printer has a capability of printing objects up to 5.9″ x 5.9″ x 5.9″ in both PLA and ABS.  It is not the fastest printer out there, but with a little patience and sub $400 prices, I was willing to give it a try.

3D Printer

After unpacking the printer and settling on the white filament for my first dive into 3D printing, I looked for something that was simple, small, and easy to print.  I picked a flop-eared bunny for one of my daughters for Easter.  I pulled this 3D model from a well-stocked source of 3D models called Thingiverse.

3D Printer Widget

It was easy to get the printer up-n-running.  Here is a sequence of photos during the 4-hour process with the final image being the bunny with all raft and supports removed.

3D Printer in Operation 3D Printer in Operation 3D Printer in Operation 3D Printer in Operation

Now that I got thru my first successful 3D print.  I started thinking more of what can I print that might be practical and useful?  I know I have always wanted something to keep my charging cords from falling behind a desk or nightstand, so you can print these:

3D Printer Cables

And how about a nice custom case for that new Raspberry Pi you recently got?  Or custom printing some other little project box?

Raspberry Pi Case made with a 3D Printer

There are many helpful projects you can print that already exist on the Internet and many colors to choose from.  Want to strike out on your own and brew your own custom widget?  Here is a chance to learn 3D modeling and there a quite a few freeware versions of software to choose from.   I recommend going to a site like 3D Printing for Beginners for starters.  There appears to be quite a bit of info on this site to keep you busy in learning about 3D printing.

Wayne, AG1A

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