Assembling the function generator kit is a straightforward task. You just need to solder some components. Start by soldering the shorter components, and then the taller ones. This will make the soldering work easier.
The XR2206 function generator DIY kit is great for electronics hobbyists for repairing and debugging circuits, and for learning purposes. The kit comes with through-hole components, and it is easy to solder and assemble. You can have it built in approximately half an hour.
Function generator kit
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Thank you for your very informative and enjoyable posts Rui! I I have learned very much from your efforts over the past several months. I built this function generator a couple of months ago and it was simple and fun to build.
Function generators are useful in a ton of applications from RF to embedded logic. They're not usually super cheap though. Good news: we found a kit. The FG085 MiniDDS Function Generator is a 'some assembly required' kit that becomes a flexible, functional and easy to use frequency generator. Just solder the through-hole parts in place, attach the face/base plates and before you know it you'll be generating sinewaves at frequencies up to 200KHz! But that's only one of the tricks this thing can do. Three different operating modes allow the FG085 to generate 7 different types of continuous waveform as well as servo test and control signals in micro-second resolution.
The schematic and PCB have remained unchanged for the model Sparkfun carries. Only the BOM was changed with U14 being removed a few months ago by JYE Tech. U14 was designed for possible future expansions and was populated at early productions. However, it has never been used even for the early firmwares. With recent firmware revisions the code space of U6 (ATmega48) has become pretty full. There will be little chance to make any significant change to the firmware in future. So JYE Tech decided not to populate U14 to save some bucks on an unnecessary component. Removing U14 is only an internal production change. It has no impact on functionality and performance of the instrument.
Okay, I did this also, and works fine for me. I have an actual usbTinyISP from ADA Fruit, used the same steps you posted above, and works fine! Output seems to work fine as well.P.S. I really like the new SWEEP function!
Documentation is a complete fail.This kit reminds me of the saying "Buy once, cry once". I was evaluating various hobby-level function generators in the $250-$500 price range. I came across this kit and figured "gee, if it's only $50 bucks, what can go wrong?" My instincts told me, don't buy it, my greediness won out.
I really don't know if the thing works well or not. I started putting it together following the instructions as best I could. However, there is an "Important Notice" about the switches that is NOT in line with the assembly instructions warning you that the push button switches only go in one way. I totally missed this. Sadly, I soldered in around 25 switches, luck would have all but about 5 were backwards. Ever tried to unsolder 300 pins? Well, let's just say I'm not even going to try, I'm just throwing the board away and will resume looking for a decent function generator.
I realize the engineer who wrote the assembly instructions is probably not a native speaker. But something important like this needs a MUCH bigger warning. Also, isn't there some other part that will do the same function as these push buttons that is polarized and not possible to put in backwards? This is an epic design fail; these parts might be okay for a production line, but not for one-off kits.
Some weeks i asssebled this function generator kit with just minor problems with the switches. It worked fine for several days of heavy usage. Suddenly tuning it on it failed and the screen only showed a row of blocks with no power up display. None of the switches are responding. Has anyone an ideaof wht happened and how to fix it?
I finished building this generator a couple of days ago. The build was easy and fun. This product is a good solution for anyone who wants to own a simple signal generator. Word of caution to beginners: the spacing between many of the pins, especially the button switches, is tight. Use a bright light and a magnifying glass to check for solder bridges. That being said, I would recommend it to someone with limited soldering skills. Just make sure you have a good iron and thin solder.Follow the building instructions that come with the package. Going to the manufacturer's web site provides some enlightenment, but their instructions are for another model. I did make one minor alteration when I installed the BNC connector (step 10). I did not cut the wing off the spring. Instead, I bent it at a right angle and soldered a 22AWG jumper between it and the board.
Just assembled this kit yesterday. The doc is spartan but clear, and I had no serious trouble with it. You should be able to handle a soldering iron with facility before attempting this kit though. I count about 200 solder joins you'll need to make on the board, although they're almost all through-hole or to pins. Setting up the output jack is marginally tricky, since you need to solder bits of hook-up wire to it in order to reach the main board from the front panel. Be careful to solder the button switches onto the board straight and flat -- use blu-tack or bend the pins outward to get them to lock in the holes to ensure this. The front panel has to fit closely over the plastic buttons, and if they're crooked you'll have a Terrible time getting it go together at the end. If you catch one that's crooked, you can re-heat the pins on one side and press it flat though. The display panel has mounting holes which correspond to holes in the main board, but no display mounting hardware is included in the kit. The display sits on stand-offs which bear on the main board and is stable once you solder its 18 I/O pins in.The kit I ordered July 16 2013 did come with the latest & greatest firmware installed per the JYE website, so I'm happy about that. Alas, the only output connector that comes with it is a BNC connector with a pair of alligator clips attached. If you wish to hook it up directly to your oscilloscope, you may need to get a BNC-to-BNC connector cable somewheres. I couldn't make it work with my oscilloscope probe, probably because I am unclear on how that works. I was able to verify that the machine was generating a signal by pressing the output A-clips into the BNC connector on my O-scope, but I'll need another cable to really delve through the functions.
Just purchased this kit for the electronics repair shop that I work at. Was very simple to assemble and it worked on the first try.I love the concept of it, and I love the functions available on the unit (the sweep mode is awesome). The waveform output isn't all that clean however. On an analog scope it doesn't appear that they filter the wave all that well as I can still see some jagged-ness in the wave. Selecting voltage outputs in the mV range yields a very noisy looking wave. My PIC-based PWM 1kHz sine wave generator puts out a much cleaner sine wave than this thing does.
Bought this kit in December. Followed the link to "Product Page" and great! Has a sweep function - which is exactly what sold me on this low cost device. So ordered. Ugh - No dice. The version Sparkfun sends you is NOT the latest firmware release - which is the version with the sweep function I needed. So off to the races on how to upgrade. Looked across 5-6 different documents to figure out how but got through the upgrade AFTER ordering the programming cable. (bought from Sparkfun - was cheaper than the one from Adafruit. Thought it would work because the schematic for the Pocket AVR Programmer has Limor Fried's name on it so they must be essentially the same.) So read the JYE Programmer doc to confirm the pins on the FG085 were compatible with the Sparkfun avr programmer cable. Looked on the adafruit website to understand how to use AVR Dude. Installed the software and programmer driver on my mac. Downloaded the firmware hex files from JYE Tech.Following instructions on the adafruit site for AVR Dude and applying their programmer instructions to the sparkfun programmer and referring to the JYE Tech documentation for their programmer and the FG085 docs to understand and confirm PIN layout compatibility - got 98% the way there when using AVR Dude to program. Its not documented but you have to use the -F option on the programming command line to force the program to load the hex file on the avr chips - this info was gleaned from the messages generated while using AVR Dude. So loaded the new firmware on both chips in the FG085 and Success!!! Firmware upgraded. Testing confirmed all works as expected. Done!!! A couple of hours of exploring many documents and web sites got me there.
So I finished putting together my function generator, did the initial power on test successfully, then put the front and back plates on and tried to power it up with my wife watching and puff! Smoke check! Fortunately, not fatal. I'd managed to drip a glob of soldier on the board somehow when soldiering the bnc connector in place, I guess. My wife is about is non-technical as one could possibly be, but oh how she enjoys watching me cringe as I power something up the first time or two, or run some code the first time. Christ! She's still cackling in our room!This was a really fun kit to put together. I think it would have been even more fun to tackle the smt stuff as well, but this was still quite challenging for me. Those switch leads are awfully close together.
I'd love it if sparkfun came up with a similar cool power supply with LED or LCD display. I bought a nice one, but like this function generator, it's always somehow more satisfying to put something together myself, even if I'm risking a smoke check or two:) Heh, even that's fun sometimes. LOL, she's still giggling. Fun for the whole family:) Cool yet another tool in my arsenal:) 2ff7e9595c
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