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MeasurementBlues
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Re: Envy?
MeasurementBlues   6/11/2014 3:28:25 PM
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@Max, there's an app for that. It's called Tone Generator. Why to to the trouble of designing hardware when you can get a free app for your phone and have it play on a Bluetooth speaker?

Would you like me to make a video to demonstrate?

Max The Magnificent
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Re: Envy?
Max The Magnificent   6/11/2014 3:12:45 PM
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@MeasurementBlues: Or they might call the police.

Once I had it working -- pushing out a 1KHz sine wave into a little speaker -- I proudly called my wife over to see what my had wrought.

"That's a very annoying sound," was her considered opinion LOL

 

MeasurementBlues
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Envy?
MeasurementBlues   6/11/2014 3:05:55 PM
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@Max how the neighbors will envy me

Or they might call the police.

Max The Magnificent
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Re: Sig gen chips XR2206
Max The Magnificent   6/11/2014 9:13:04 AM
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@MWagner_MA: Max, once again you reinforce the reason a lot of us got into Electronics.... its fun!  [...] Keep up the good work :-)

Why, thank you so much for your kind words -- the strange thing for me is the people who don't see just how much fun electronics can be. Just wait till I have my BADASS Display up and running :-)

MWagner_MA
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Sig gen chips XR2206
MWagner_MA   6/11/2014 7:22:04 AM
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Max, once again you reinforce the reason a lot of us got into Electronics.... its fun!  Your article caught my attention as I also needed a signal generator for some home projects, but not enough to fork over the cash for some swanky Agilent unit.  I built my own around 1981 around a Radio Electronics (remember those guys?) article using an Exar XR2206 chip.  Still have the unit to this day for audio work.  Keep up the good work :-)

Douglas442
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Re: 8038
Douglas442   6/10/2014 9:43:16 PM
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The ICL8038 is one of those chips that have found their way into modular synthesis applications. As such, there are numerous sites that discuss it's use, provide plans, and even offer sale of these, as well as other hard-to-find devices.

Perhaps one particularly useful design, one which overcomes some of the limitations of the 8038, can be found here:


http://www.birthofasynth.com/Thomas_Henry/TH_main.html 

or, more directly, here:

http://www.birthofasynth.com/Thomas_Henry/Pages/8038.html

The author provides details which include schematics, BOM, and even a PCB pattern. 

... luckily for me, at least, as I currently have ten of these chips to make use of.

betajet
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Re: 8038
betajet   6/10/2014 7:54:18 PM
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antedeluvian wrote: for some reason everyone has continued them...

According to the brief Wikipedia page on the ICL8038:
The triangular waves were converted to sine waves involving a non-linear network of transistors and thin-film resistors.

I'm not an IC design expert, but that sounds pretty expensive.  Maxim used to sell a copy, but it's also EOL.  The Maxim site shows how to use a square wave oscillator followed by a high-order switched-capacitor filter to get sine waves.

David Ashton
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Scaredy-cat.....
David Ashton   6/10/2014 6:18:53 PM
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@Max.... "Ivan rooted around under a bench and extracted a somewhat battered old case....something that scared the socks off me."

Wuss!!  Doesn't look toooo complicated.  Just a couple of breadboards with a frequency generator and some switches and LEDs.   But your new toy does look very tasty.

I can never get EET to post pictures but in copying your text I got a couple of pictures in and of course they posted in the comment without problem, and instead of struggling to get them in I had to delete them out.  Doesn't it make ya spit???

 

Max The Magnificent
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Re: 8038
Max The Magnificent   6/10/2014 5:49:51 PM
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@antedeluvian: It was a low frequency oscillator for all seasons.

There were some great chips back then -- my frequency/function generator uses a microcontroller to create it's waveforms -- it really is amazingly tasty (we just had it up on the workbench -- watch for my blog tomorrow)

antedeluvian
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8038
antedeluvian   6/10/2014 5:47:02 PM
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Max

Let me be the first to reminisce about the Intersil/Exar/Harris 8038. It was a low frequency oscillator for all seasons. For some reason everyone has continued them, but there muist be many around hidden in drawers etc. I may even have a couple myself. If you want o go this way, put out a call- someone will be able to help.

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