DDS functional generator cheap 30$ form ebay opinion

[Vancata]

Is it worth buying one of the 30$ DDS signal generator from ebay? I know they will just do the job for me but i was wondering for other opinions. (I work with small freq like from 100khz to 7-8mhz mostly clock square signal and some sine from time to time).

[Skimask]

Whatever you do, DON'T provide a link to the product you're describing...

[Vancata]

Lol sorry I thought I included it in the 1st post..
http://www.ebay.com/itm/DDS-Function-Signal-Generator-Module-Sine-Square-Sawtooth-Triangle-Wave-/290943263957?pt=LH_DefaultDomain_0&hash=item43bd91e4d5

[lapm]

personally i got cheap chinese hung low (7 euros) DDS generator module. Needed microcontroller to be useful but work fine for my humble need.

If you need display and those controls i thin thats worth it.

Might not be super accurate as these cheap ones usually are giving up something for low price, but if you dont need precision then go for it..

[pickle9000]

Things like this are always handy, I have 3 bench signal gens and often make up a simple pulser for this or that. It's a good price and if it can save you a few minutes then why not.

[mtdoc]

(I work with small freq like from 100khz to 7-8mhz mostly clock square signal and some sine from time to time).

Note the one you linked to on ebay says  "DDS frequency range: 1HZ-65534Hz".

There are other ebay specials that go to the frequency range you need. I have no idea about their quality....

[Vancata]

Thanks for the advice folks!
Yeah just noticed this one really was up to 65kHz.
Anyway will get the one that fits in my range. I don't expect much anyway, just to feed up my clock signals is enough, don't even need perfect signals, just the levels on the output with out high ripples.

And the display looked a nice feature to me, so guess will get one with lcd + back light for first one

[apelly]

I bought one of these http://www.ebay.com/itm/DDS-Function-Signal-Generator-Module-Sine-Triangle-Square-Wave-Servo-Signal-/281220887054?pt=LH_DefaultDomain_0&hash=item417a12320e a while ago. It is an open source kit. Tronixstuff may have reviewed it I think. Mine is missing some eeprom, and refuses to boot sometimes. Haven't been bothered fix it yet. The software is maintained however and it's fine, when it's working. I'm sure I just got a dud.

[electronupdate]

Is it worth buying one of the 30$ DDS signal generator from ebay? I know they will just do the job for me but i was wondering for other opinions. (I work with small freq like from 100khz to 7-8mhz mostly clock square signal and some sine from time to time).

I  bought a very similar looking unit (mine says rev 2.1, versus the one you are looking at with a rev of 2.0).  If it's similar:

 -- poor user interface.  you need to stop wave form generator to make any changes
 -- output driver is a simple op-amp without protection.  Easy to damage it when driving a 50 ohm load with the output set to high.
 -- I don't think there is an anti-alias/reconstruction filter.

Review here: