Author Topic: looking Function Generator project  (Read 7394 times)

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Offline peps1Topic starter

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looking Function Generator project
« on: April 17, 2013, 02:31:15 pm »
Hello guys,

Just go my first oscilloscope, so looking to get a Function Generator next.......but would like to build one as a project  :-/O

not having used one before it hard to know what features I should be looking for  :-// so, hope someone can point me in the right direction!

90% of my electronics work is analog audio, but I am getting more interested in digital logic and switching.
 

Offline ddavidebor

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looking Function Generator project
« Reply #1 on: April 17, 2013, 02:37:45 pm »
Sine, square, triangle... Zero to a couple of Mhz is cheap and great
David - Professional Engineer - Medical Devices and Tablet Computers at Smartbox AT
Side businesses: Altium Industry Expert writer, http://fermium.ltd.uk (Scientific Equiment), http://chinesecleavers.co.uk (Cutlery),
 

Offline peps1Topic starter

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Re: looking Function Generator project
« Reply #2 on: April 17, 2013, 06:30:12 pm »
 :-+ thanks mate!

Anyone got a link to a suitable project with PCB artwork?
 

Offline ddavidebor

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Re: looking Function Generator project
« Reply #3 on: April 17, 2013, 06:36:27 pm »
well, i suggest you to buy something used. it's not like a power supply that you can build of good quality.

you can buy a good function gen with 60€
David - Professional Engineer - Medical Devices and Tablet Computers at Smartbox AT
Side businesses: Altium Industry Expert writer, http://fermium.ltd.uk (Scientific Equiment), http://chinesecleavers.co.uk (Cutlery),
 

vlf3

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Re: looking Function Generator project
« Reply #4 on: April 17, 2013, 08:29:03 pm »
See circuit below for a function generator 1Htz to 20Mhz, this was found on the web some time back; you would need to source the Max chip, and do a PCB lay-out...

 

alm

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Re: looking Function Generator project
« Reply #5 on: April 17, 2013, 09:24:40 pm »
The MAX038 was discontinued by Maxim quite a few years ago (I think it was around the time they switched all their processes to RoHS and discontinued the process used for the '038). It may still be available from shady eBay sellers. Expect it to be expensive ($20 or so), and the usual risk of buying from random Chinese sellers (could be desoldered or fake).

This is too bad, since it was much better than the lousy XR2206.
 

Offline MacAttak

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Re: looking Function Generator project
« Reply #6 on: April 17, 2013, 10:16:12 pm »
Interesting engineer name on that schematic.
 

Offline BillyD

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Re: looking Function Generator project
« Reply #7 on: April 17, 2013, 10:16:54 pm »
Variable duty cycle or PWM (for square waves) is another useful feature.

I have one of these, not very pretty but cheap and functional :
http://www.ebay.co.uk/itm/DDS-Sweep-Function-Signal-Generator-Wave-Meter-New-5MHz-/290677832126

 

Offline c4757p

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Re: looking Function Generator project
« Reply #8 on: April 17, 2013, 10:20:28 pm »
Interesting engineer name on that schematic.

I knew it looked familiar!

20MHz High Speed Function Generator
No longer active here - try the IRC channel if you just can't be without me :)
 

Offline notsob

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Re: looking Function Generator project
« Reply #9 on: April 17, 2013, 10:28:12 pm »
I wouldn't bother making one with the units available from Rigol, but if you must, you can get the MAX038 from futurlec for ~$23
http://futurlec.com/ICMaxim.shtml

Other MAX038 circuits  are Dick Cappels version  http://cappels.org/dproj/functsweep/functionswp.html
and Georgio's version http://www.pcbheaven.com/projectpages/High_Frequency_Function_Generator/


Cheers

Peter
 

Offline Resistoid

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Re: looking Function Generator project
« Reply #10 on: April 17, 2013, 11:12:09 pm »
Peps1, if you want to buy a MAX038 in the UK you might try here:

http://www.ebay.co.uk/itm/MAX038CPP-High-Frequency-Waveform-Generator-MAX038-/180860239105

I have not used this source, hence I am unable to make a more substantive recommendation.

Resistoid.
 

Offline peps1Topic starter

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Re: looking Function Generator project
« Reply #11 on: April 18, 2013, 10:49:10 am »

I knew it looked familiar!

20MHz High Speed Function Generator

Just what im looking for......but sems to be missing a component layout  :-//

Peps1, if you want to buy a MAX038 in the UK you might try here:

http://www.ebay.co.uk/itm/MAX038CPP-High-Frequency-Waveform-Generator-MAX038-/180860239105

Thanks mate!
 

Offline Rerouter

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Re: looking Function Generator project
« Reply #12 on: April 18, 2013, 10:54:45 am »
its not missing one, you will have to lay it out if you want it, a large number of designs on the net are only published as schematics as then they can be adapted loosely into whatever it is your making,
 

Offline peps1Topic starter

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Re: looking Function Generator project
« Reply #13 on: April 18, 2013, 11:07:19 am »
its not missing one, you will have to lay it out if you want it, a large number of designs on the net are only published as schematics as then they can be adapted loosely into whatever it is your making,

 ??? that seems to be the very definition of "missing".......Not present; absent.
 

Offline c4757p

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Re: looking Function Generator project
« Reply #14 on: April 18, 2013, 11:47:14 am »
Dude, the link for the layout is right under the link for the schematic.
No longer active here - try the IRC channel if you just can't be without me :)
 

Offline peps1Topic starter

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Re: looking Function Generator project
« Reply #15 on: April 18, 2013, 12:47:46 pm »
Dude, the link for the layout is right under the link for the schematic.

Dude, I don't see it!?!?!?!  :-//

Just link for the schematic and PCB....no component layout?

Am I going blind? 
 

Offline c4757p

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Re: looking Function Generator project
« Reply #16 on: April 18, 2013, 12:54:22 pm »
Oops, I thought they'd be labelled on the PCB in the absence of a separate layout chart. Sorry. Yeah, I don't see one either. Still, it's a simple enough circuit, you could work it out pretty quickly from the schematic and PCB.
No longer active here - try the IRC channel if you just can't be without me :)
 

Offline Resistoid

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Re: looking Function Generator project
« Reply #17 on: April 18, 2013, 02:09:04 pm »
@ peps1: You're welcome.
 

vlf3

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Re: looking Function Generator project
« Reply #18 on: April 18, 2013, 10:45:39 pm »
Nice to see members have good memories, I just did-not want to say where it came from, hope it's okay Dave.  ::)
 

Offline Ferroto

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