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Cheap Square generator stable from 10Hz to 500Khz

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luca1000:
Hi,

I Like to know if exist some complete DIY (PCB and components already assembled)  low cost Square generator stable from 10Hz to 500Khz with these features:

1) Variable amplitude.
2) Powered by 9 Volt battery.
3) Small size.

On ebay there are differents, but don't seem stable after 100 Khz or this is my impression.

Someone have try some of these ??

tom66:
It's called a 555 timer. They are stable to within 0.5% over operating voltage. If you use good components, temperature won't affect them much.

Now, if you need a frequency readback something like this may work better:
http://www.ebay.co.uk/itm/The-New-DDS-function-Low-frequency-test-signal-generator-module-sine-square-cis-/200950656828?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item2ec997af3c

You can probably use a 9V battery with DC jack clip to power it.

luca1000:
This is very interested and I have already see it on ebay.

The problem is I don't see sufficient result on oscilloscope.

for example here:

http://www.ebay.it/itm/321040706273?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

I see it is not stable on 1 Mhz, but I don't know how work on 500Khz.

luca1000:
I review better this:

http://www.ebay.co.uk/itm/The-New-DDS-function-Low-frequency-test-signal-generator-module-sine-square-cis-/200950656828?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item2ec997af3c

and seem not stable for frequency >150Khz.

JuanPC:

--- Quote from: luca1000 on August 31, 2013, 10:10:18 pm ---The problem is I don't see sufficient result on oscilloscope.

--- End quote ---

#1. What Scope do you have?= Brand, Model & Firmware version.

Maybe is the scope.

#2.
what you are looking is:
A) an Oscilloscope Training Kit.
http://www.gwinstek.com/en/product/productdetail.aspx?pid=3&mid=301&id=1310
http://www.gwinstek.com/en/product/productdetail.aspx?pid=3&mid=301&id=59

B) or a Bench Generator.
DDS, ARB, etc...
http://www.gwinstek.com/en/product/productbcategory.aspx?pid=5

I do not work for Instek, I just like the Brand.

#3. P.S.
To measure any Square wave, you need 20x the frequency, to measure 10 harmonics, or 10x the frequency to measure 5 harmonics,
less than 5 is not a Square wave.

#4.
Alternative, build one with Arduino or FPGA.

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