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Questions & Answers
Not sure what is used, if anything, for output conditioning circuit but have you considered loading the output? try a 600-ohm 1/2-watt resistor across the output at @10% amplitude... these things are typically spec'd at 600-ohm impedance
By Fixer on July 14, 2017
According to stock spec sheet...8mA...measured at pin 1...its just a signal generator...not a driver...very low current
By Michael A. Mounts on May 9, 2018
The instructions, and schematic had that information, provided you did get the schematic. The connector is a 2.5 mm, center pin positive connector. As for the power supply, a 9 volt battery connector, and a 2.5 mm connector soldered to it will do. Do not exceed 12 volts. More voltage is not better. 9 volts will do fine… see more The instructions, and schematic had that information, provided you did get the schematic. The connector is a 2.5 mm, center pin positive connector. As for the power supply, a 9 volt battery connector, and a 2.5 mm connector soldered to it will do. Do not exceed 12 volts. More voltage is not better. 9 volts will do fine. If all you have is 12 volts, a 9 volt 3 lead regulator would work. The device package should have a useful, basic regulator schematic on it, if not, look it up on the web. These regulators are as common as dirt, and inexpensive. Best power supply, for cost and ease of use, the 9 volt battery and connector clip. see less
By kerry keel on April 20, 2018
This cannot just be set to a certain frequency. You have to turn the dials and use the clips to select the correct frequency range and then try to reach your set frequency with the two frequency dials. So, no this might not be what you are looking for, but if you just want to create adjustable sine waves in a cheap man… see more This cannot just be set to a certain frequency. You have to turn the dials and use the clips to select the correct frequency range and then try to reach your set frequency with the two frequency dials. So, no this might not be what you are looking for, but if you just want to create adjustable sine waves in a cheap manner then this might be the product for you. If so use careful soldering. see less
By Trumar on March 9, 2018
Only the outside plastic case. Be VERY careful, fit it together before making the final assembly. I had issues with the case clearing the power input connector, as well as a tab and slot in another area not aligning properly. The maker has been told about this. One other point, make sure the connector for the outputs i… see more Only the outside plastic case. Be VERY careful, fit it together before making the final assembly. I had issues with the case clearing the power input connector, as well as a tab and slot in another area not aligning properly. The maker has been told about this. One other point, make sure the connector for the outputs is turned outward, so that the side where wires are connected for the output are indeed facing outward. Other than these issues, if a person is experienced, the bad directions for assembly can be set aside and just follow the circuit board pattern and values to assemble this very good test device. The resistor values may be hard to read, so use an ohm meter to find the right part to go to which position. Be careful, take your time, and it should all go together quite well. Other than the case issues, and the very bad assembly directions, it IS a good signal generator. see less
By kerry keel on March 3, 2018
No,not with any stability.
By Bart Graves on February 19, 2018
The xr2206 is a monolithic function generator. The e.l.f. or Extremely Low Frequency spectrum is a range of frequencies of 3 ~ 30-hz. If you are trying to block this specific range, I am not sure that is even possible since wave propagation in this range is 100,000-10,000 km and very close to earth-ground...
By Fixer on February 8, 2018
This is a function-signal generator. I don't know in what regard you are referring to as "milliamp" (current).
By Tessa on February 4, 2018
This device as a signal generator, a frequency counter and an oscilliscope are the devices needed to set up an AM radio. Remember, the IF or intermediate frequency is 455KC. Look for the set up process on youtube.com
By Barbara Bequette on December 28, 2017
The data sheet that came with mine, under 4.3 indicates "center positive / barrel negative". It also specifies 9-12 volts. It all worked for me.
By Marika Yamaguchi on November 16, 2017
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based on 167 Customer Reviews
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By Bryan Hord
April 11, 2020
The XR2206 is a fairly good part and this product uses the basic functions to provide a good signal source over the audio range and beyond. I bought it as an add on for an inexpensive modular synthesizer. All the pieces do not fit together well. The power connector is too long an interferes with the side. The leads on the back must be cut and files for the bottom to fit. But it does make sine, triangle and square waves over a wide frequency and amplitude range and it is tolerably temperature stable. The datasheet for the part will give you ideas for adding functionality and improving performance if you like hacking hardware.
By Paul Carne
February 10, 2020
By Ida J.
February 9, 2020
February 9, 2020
February 7, 2020
February 7, 2020
to couple with the Quartz / frequency meter tester, this makes a cheap amateur lab generator. Weird behavior in the high frequencies but quite correct to use in LF generator (0-100kHz). Attention: - put a 10k + 10k voltage divider at the output of the square signal (10V) to enter the frequency counter at 5V.
February 5, 2020
January 29, 2020
By Tom N
December 23, 2019
December 23, 2019
Getting it up and running took longer than it should have. The 3K-65KHz setting was giving me a response of 3Hz-80Hz. I eventually took out the associated cap (labeled 222, correct according to the schematic) and measured it. According to my multimeter, it was 2.2uF instead of 2.2nF. Never seen a cap that small have that high of a capacitance, but it seemed right based on the frequency response. Luckily I had a 2200pF ceramic cap on hand and using it instead worked like a charm. Other things: - I can't get the square wave generator to function correctly. The scope measures it as a negative voltage with a very small amplitude. I'm not sure what's up there. Trace connections and the resistor all check out from probing around. - The green jumpers are annoying. The metal contacts keep popping out of them. Eventually I just superglued them in and they seem to be holding. Cheap, but still worth the money. The Arduino timers can do my square waves when I need them. One day I may buy a better function generator but this will do for the time being.
December 19, 2019
By Kevin Heindel
December 19, 2019
By Edward C.
December 17, 2019
By A. W. Labrador
December 16, 2019
I've long wanted a function generator for my little hobby projects at home, but I didn't think I could justify the expense of a real lab function generator, in the same way that I couldn't justify buying a full oscilloscope and instead have a cheap digital oscilloscope (DSO Nano v3 from Seeestudio). At $12-13, this kit fit the bill nicely, cheap enough to be a throwaway if it didn't work out, but functional enough -- just barely -- to do the job. My experience is pretty much the same as most reviewers. The assembly instructions are sparse to say the least, but it's pretty easy to assemble for people with a moderate amount of electronics soldering experience. It took me somewhere between 30 and 60 minutes to finish. As others have noted, the amplitude pot function is reversed, and there's a sizable DC offset to the output. The sine wave is more like a rounded triangle wave than a true sine wave, and the square wave amplitude doesn't seem to be adjustable (unless I did something wrong in assembly). With the DC offset, it's easy to hit the upper voltage limit and get your output signals flattened at the top. In short, there's no way this thing could be considered a "high precision" function signal generator. However, for the price, it's a nice kit, and it can be made to generate useful, rudimentary test signals.
By Aaron Brown
December 16, 2019
It worked very well as it was supposed to, but it's enclosure was a joke. It didn't fit and I had to force it on, the screws weren't even long enough to make the distance. The top looks different than the picture but I don't think it was an issue. if you ignore the enclosure, the design is great and serves as a simple function generator for low frequencies.
December 15, 2019
The knobs are a little weird to work. You can max out the coarse knob but then you have to also max out the fine knob in order to get up to the highest frequencies per band. My amplitude knob doesn't do anything. I am going to swap it out with one of the other knobs to see if it's that or something else on the board (if it wasn't for that, I would have given it 5 stars). The board was easy to put together and the solder pads were nice and big. I don't necessarily like the pin jumpers that they provided, as both of them left the metal internal part on the pins when I pulled it out to switch to another frequency. The case doesn't fit great because of contact with the two 10 micro Farad capacitors. I used a countersink bit to remove some material above the two caps in order to get the lid to fit without bowing, and then I noticed it also was pressing down on the microcontroller. Probably not a big deal, but it just didn't fit well. All that aside, it's a nice little kit that does what it's supposed to.
By Ben Doan
December 14, 2019
A correction is needed on the board since a printed circuit trace is in on wrong pin of the I.C. You will need to break the connection to pin 8 and move it to pin 7. Hopefully this has been corrected by the manufacturer. It's an easy mistake to make in printed circuit design.
By Martin Winston
December 14, 2019
Remember Heathkit? Putting together their electronic kits was never quite as simple as it could have been, partly because their 2D illustrations often confused perspective, making it hard to know if you read something backwards until several steps later, when there was work you had to undo before moving forward again. Marty just finished a small signal generator kit. The electronics were easy enough, despite badly written instructions. Mounting the board to the case & assembling the case’s 6 sides was entirely undocumented despite requiring an explicit sequence of events. Even more aggravating: success would have been impossible with the provided hardware because the board had to be elevated for its barrel connector to be accessible through its case cutaway. We solved it with our own hardware & the one resultant crack in the case is nearly invisible. The device does deliver the square, sine and triangle waves it promises and they look clean on the oscilloscope but their obvious cost-cutting on assembly documentation is a major shortcoming; I would have gladly paid a few dollars more to get it assembled and tested.
December 13, 2019
I wouldn't call this product "high precision," but it does perform its basic functions. It is basically just the reference/demo circuit for the 2206 chip. It can be used to measure the frequency response of an audio setup, but would be useless for measuring THD. The distortion of the sine wave output is pretty severe. The distortion increases with power supply voltage. I recommend 9 volts. It has a few peculiarities. As previously noted, the amplitude pot is wired backwards of the two frequency pots. The assembly instructions appear to have been written by an early version of Google Translate. The case is a Chinese puzzle box. You'll end up taking it apart and putting it back together several times before it's right.
December 13, 2019
For a low cost function generator it's OK. The weaknesses are as follows: 1) Both the sine and triangle functions really just resemble sine and triangle on the scope, but the distortion from true sine and triangle is pretty high. I didn't check the THD of the sine function (~2 kHz), but I would guess it's in the 4-8% range and gets much worse when approaching full amplitude. 2) The amplitude knob operates in reverse - clockwise LOWERS the signal amplitude. Sometime in the future I may reroute the traces so it is correct, but will live with it for now. 3) The squarewave function has no amplitude control which was noted in the listing, but still a significant drawback. On the PLUS side it comes with a plastic assemble-yourself case with labels for the jumper, output, knob functions laser etched. Unless you really have to have a clear case I would recommend leaving the paper on at least the top panel, otherwise you'll probably be straining to see the lettering with all the circuit board showing through. It's also very reasonably priced and I intend to throw it in my travel electronics test box that also contains a DSO-138 scope and multimeter.
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