Christer said:
You are totally right! 317 SEK is incredible! OK, a little bit better than other chips, but still.
I've seen the MAX part in stock at Digi-Key just a few months ago, and I should have ordered then, but tried to get them as samples instead. 🙄
Sparhawk:
That would be fantastic! I'll be visiting Vancouver at the end of November, so you might be able to send them to me there. Send me an email if you find them, and let me know if there's something you'd like to trade for. Thanks!
jackinnj / dlharmon:
PIC+SRAM+DAC is a good way to go, especially if you want arbitrary waveforms, but it's considerably more work than hooking up one of these little chips. It seems like too much effort though for a basic function generator.
Sparhawk:
That would be fantastic! I'll be visiting Vancouver at the end of November, so you might be able to send them to me there. Send me an email if you find them, and let me know if there's something you'd like to trade for. Thanks!
jackinnj / dlharmon:
PIC+SRAM+DAC is a good way to go, especially if you want arbitrary waveforms, but it's considerably more work than hooking up one of these little chips. It seems like too much effort though for a basic function generator.
HIFIZEN
A PIC is cheaper, they are widely available (MAX exclusive distributor is Digikey, which is fine, but if they have a snowstorm in Minnesota your SOL😉), you can precisely order the frequency and it's crystal stable. But you do have to filter the output, and you need a 20MHz chip to get decent resolution.
Just kidding about Digikey, they are very prompt. I don't weborder from them since the people are actually nice to talk to. (I web order from Newark, Allied, Future-Active, Mouser and Jameco.)
A PIC is cheaper, they are widely available (MAX exclusive distributor is Digikey, which is fine, but if they have a snowstorm in Minnesota your SOL😉), you can precisely order the frequency and it's crystal stable. But you do have to filter the output, and you need a 20MHz chip to get decent resolution.
Just kidding about Digikey, they are very prompt. I don't weborder from them since the people are actually nice to talk to. (I web order from Newark, Allied, Future-Active, Mouser and Jameco.)
One more thought
Analog Devices has an application note on the use of their digital pots as a Wien Bridge Oscillator. Going this route you can probably achieve distortion in the thousandths of a percent, precise frequency determination. etc. Of course, you will also need to build in a multiplexer to switch the range caps, but this is no big deal, and you will probably filter the output...
Analog Devices has an application note on the use of their digital pots as a Wien Bridge Oscillator. Going this route you can probably achieve distortion in the thousandths of a percent, precise frequency determination. etc. Of course, you will also need to build in a multiplexer to switch the range caps, but this is no big deal, and you will probably filter the output...
I recently found a function generator schematic that utilizes the MAX038- does this look like a good design? The website is:
http://www.web-ee.com/Schematics/Function Generator/function generator.htm
-Brian
http://www.web-ee.com/Schematics/Function Generator/function generator.htm
-Brian
Attachments
These Chips are impossibl to find!!!
Anyone have any luck finding them? I need some for work, and can't get any. We've got some on order from Max, but the're saying 16 week lead time!
How can a company make money not selling what it designs??? You'd think we'd all stop looking at the MAX parts.
-Dan
Anyone have any luck finding them? I need some for work, and can't get any. We've got some on order from Max, but the're saying 16 week lead time!
How can a company make money not selling what it designs??? You'd think we'd all stop looking at the MAX parts.
-Dan
That's what we did, stopped specing MAX at all.
We used to use MAX412 op-amps for a signal conditioning front end circuit (about 100K annual quantities). After 2 years of steadily worsening delivery performance we switched over to the LT-1213.
I think Max's marketing stategy is to release a million new parts every year and only actually manufacture the ones that get big orders.
Linear Tech is a much better supplier.
Phil
We used to use MAX412 op-amps for a signal conditioning front end circuit (about 100K annual quantities). After 2 years of steadily worsening delivery performance we switched over to the LT-1213.
I think Max's marketing stategy is to release a million new parts every year and only actually manufacture the ones that get big orders.
Linear Tech is a much better supplier.
Phil
Maxim has the highest margins in the biz
but they apparently do so by maximizing their production runs, and then terminating. I guess they hold no inventory, and they only distribute through Digikey (at least in the US.) I note that the ARRL used to publish a neat NiCad charger circuit using one of their chips but dropped it from publication in the handbook.
but they apparently do so by maximizing their production runs, and then terminating. I guess they hold no inventory, and they only distribute through Digikey (at least in the US.) I note that the ARRL used to publish a neat NiCad charger circuit using one of their chips but dropped it from publication in the handbook.
Just in case any of you are still looking in vain for the MAX038
and need it badly, I just checked with Elfa here in Sweden and
they have over 100 of them in stock. I don't know if you can
get them to ship abroad, though.
www.elfa.se
It would seem stupid to ship ICs back to the US, but if you
really cannot get them otherwise, why not?
and need it badly, I just checked with Elfa here in Sweden and
they have over 100 of them in stock. I don't know if you can
get them to ship abroad, though.
www.elfa.se
It would seem stupid to ship ICs back to the US, but if you
really cannot get them otherwise, why not?
Christer said:
Thanks! But, I found a workaround, with a cheaper IC. We were doinga PWM, using the Max as a signal gen.
I'm going to start using ANYTHING other than MAX parts from now on!
-Dan
if you were doing PWM
why didn't you first think of a PIC or an AVR? You can write PWM in just a few keystrokes.
why didn't you first think of a PIC or an AVR? You can write PWM in just a few keystrokes.
Re: if you were doing PWM
It was an existing design, I was modifying. I decided to do a complete redesign, and simplify things. Programming is a little overkill for this application. The things is that the MAX is stable over time. But as it turns out iwith a few other circuit mods, frequency stability isn't as critical as was previously belived.
Anyway, I'm still planning on not using MAX parts!
-Dan
jackinnj said:
It was an existing design, I was modifying. I decided to do a complete redesign, and simplify things. Programming is a little overkill for this application. The things is that the MAX is stable over time. But as it turns out iwith a few other circuit mods, frequency stability isn't as critical as was previously belived.
Anyway, I'm still planning on not using MAX parts!
-Dan
RAGE!
Well, I did it...
I ordered a MAX308 kit and built it. On the way, I found one of the variable resistors to be broken (the PCB was snapped). I rang back the company who started giving me abuse! He said things like "Every b****** saturday I get people trying to be smart with me..." and "Now you're just being stupid - parts can't break!"...His manner was disgusting...all for the sake of a pot! He finally (and reluctantly) agreed that if I sent back the part, he could get me a new one in three weeks...That's 27p postage + 3weeks...I bought a new one from a local store for 25p!
After it was all assembled, I found that the signals I was getting was just noise. The MAX308 was running too hot to touch and the sillyscope (as my GF calls it) was all over the place. Eventually I decided to (possibly) fry one of my own MAX308s and replaced it with one from my own collection...It worked amazingly! It is stable upto 20MHz as they stated!
The morel of the story is that I will never order from QUASAR ELECTRONICS again and I urge you to steer clear aswell! Not only is he abusive, and unable to stay polite when informed of a problem (I would state here that I never became abusive myself, let alone raise my voice), but he could not admit that maybe one of the parts was damaged, and even provided me with a duff MAX308! I didn't tell him about this...I won't be talking/ordering from him again!
Anyway, the MAX308 seems like a very competant chip and is clearly a very useful tool.
Well, I did it...
I ordered a MAX308 kit and built it. On the way, I found one of the variable resistors to be broken (the PCB was snapped). I rang back the company who started giving me abuse! He said things like "Every b****** saturday I get people trying to be smart with me..." and "Now you're just being stupid - parts can't break!"...His manner was disgusting...all for the sake of a pot! He finally (and reluctantly) agreed that if I sent back the part, he could get me a new one in three weeks...That's 27p postage + 3weeks...I bought a new one from a local store for 25p!
After it was all assembled, I found that the signals I was getting was just noise. The MAX308 was running too hot to touch and the sillyscope (as my GF calls it) was all over the place. Eventually I decided to (possibly) fry one of my own MAX308s and replaced it with one from my own collection...It worked amazingly! It is stable upto 20MHz as they stated!
The morel of the story is that I will never order from QUASAR ELECTRONICS again and I urge you to steer clear aswell! Not only is he abusive, and unable to stay polite when informed of a problem (I would state here that I never became abusive myself, let alone raise my voice), but he could not admit that maybe one of the parts was damaged, and even provided me with a duff MAX308! I didn't tell him about this...I won't be talking/ordering from him again!
Anyway, the MAX308 seems like a very competant chip and is clearly a very useful tool.
Hi Rarkov
I don't know if it's just because the site is under construction, but none of the links on the main page work under mac browsers, ( tried Icab, Opera, and IE5) 🙁
Your speaker project animation looks good tho, how about a fade to a wireframe as well!😎
I don't know if it's just because the site is under construction, but none of the links on the main page work under mac browsers, ( tried Icab, Opera, and IE5) 🙁
Your speaker project animation looks good tho, how about a fade to a wireframe as well!😎
Hi,
They're not links. They're dropdown menus that will display the links. They're similar to the ones on the MSDN website...I was hoping they'd degrade well but obviously not. I'd be interested to know if the ones on MSDN work for you?!
Click for MSDN
The page hasn't been worked on for a while, but I'll get back to it soon. I'm doing a small web design contract ATM so probably after that!
Thanks,
(A very much calmed down...)Gaz
They're not links. They're dropdown menus that will display the links. They're similar to the ones on the MSDN website...I was hoping they'd degrade well but obviously not. I'd be interested to know if the ones on MSDN work for you?!
Click for MSDN
The page hasn't been worked on for a while, but I'll get back to it soon. I'm doing a small web design contract ATM so probably after that!
Thanks,
(A very much calmed down...)Gaz
Hi, if you mean the ones marked Key topics, Community, etc, they work fine.
Just checking the Quasar site, £70 seems an awful lot for a kit, is the chip expensive or something? ( not that I will be ordering from them after your experience😉 )
Just checking the Quasar site, £70 seems an awful lot for a kit, is the chip expensive or something? ( not that I will be ordering from them after your experience😉 )
Just realised I've been calling it a MAX308...I know it's MAX038...Just being stupid!
The last time I looked, the chip was 11-12 quid...
Glad to know that the drop down menus work! 😉 As you've realised, the site is UC so not everything (read as 'nothing') works! 😉
Edit:
I will try and work out how MS get their ones working yet mine don't! 🙁
Gaz
The last time I looked, the chip was 11-12 quid...
Glad to know that the drop down menus work! 😉 As you've realised, the site is UC so not everything (read as 'nothing') works! 😉
Edit:
I will try and work out how MS get their ones working yet mine don't! 🙁
Gaz
for frequency synthesis
pop "DDS" into the search engine at any of the DSP houses to see how it can be done with a sine and cosine table. The math is:
d(phase)/dt = 2 pi f
f = d(phase) * f(clock)/2 pi
It's a little impractical for the DIY'r, although ham homebrewers use the dds chips in receivers and transmitter.
Chips like the AD9850, AD7008 have a numerically controlled oscillator, phase acumulator, sin and cos ROM, DAC etc. Acuracy is parts per billion. The chips only cost in the $20 - $30 vicinity, but their applicability to audio DIY, well I wonder....perhaps a very acurate, very low jitter clock?
pop "DDS" into the search engine at any of the DSP houses to see how it can be done with a sine and cosine table. The math is:
d(phase)/dt = 2 pi f
f = d(phase) * f(clock)/2 pi
It's a little impractical for the DIY'r, although ham homebrewers use the dds chips in receivers and transmitter.
Chips like the AD9850, AD7008 have a numerically controlled oscillator, phase acumulator, sin and cos ROM, DAC etc. Acuracy is parts per billion. The chips only cost in the $20 - $30 vicinity, but their applicability to audio DIY, well I wonder....perhaps a very acurate, very low jitter clock?
Hi,
Just ordered some MAX307, MAX038 and some MAX335...
All of them turned up without any problems...2 of each.
The reason is that I gave away my last one, and I like to have some expensive chips lying around! 😉
No, really, they're all very useful. A dual 8:1 mux (307(8)cpi), The function generator, and an 8 way SPST switch...
All great for audio...
Not sure why my depot will send me out components...Could have something to do with the projected 20,000 annual usage? 😉
Gaz
Just ordered some MAX307, MAX038 and some MAX335...
All of them turned up without any problems...2 of each.
The reason is that I gave away my last one, and I like to have some expensive chips lying around! 😉
No, really, they're all very useful. A dual 8:1 mux (307(8)cpi), The function generator, and an 8 way SPST switch...
All great for audio...
Not sure why my depot will send me out components...Could have something to do with the projected 20,000 annual usage? 😉
Gaz
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