Reply by Joerg February 4, 20132013-02-04
Tauno Voipio wrote:
> On 3.2.13 10:55 , Phil Hobbs wrote: >> >> Of course, in Finland sausage is considered a vegetable. ;) >> >> Cheers >> >> Phil Hobbs >> > > Yep. The leading brand is HK Blue. > > But it is damn good when roasted on a stick like > marshmallows in the big West. >
Have you ever tried Johnsonville Brats? (Bratwurst). Roasted over a wood fire, outdoors, yumm. I could eat 3-4 in a row but of course that's not healthy so I restrict myself to one. Nothing better than standing around the fire with a beer in hand, discussing politics, cars and football :-) -- Regards, Joerg http://www.analogconsultants.com/
Reply by Tauno Voipio February 4, 20132013-02-04
On 3.2.13 10:55 , Phil Hobbs wrote:
> > Of course, in Finland sausage is considered a vegetable. ;) > > Cheers > > Phil Hobbs >
Yep. The leading brand is HK Blue. But it is damn good when roasted on a stick like marshmallows in the big West. -- -Tauno
Reply by Phil Hobbs February 3, 20132013-02-03
On 2/3/2013 2:18 PM, Mr Stonebeach wrote:
> On Feb 3, 5:29 pm, Joerg <inva...@invalid.invalid> wrote: >> Then I might a well just buy the bare chip, it's cheaper :-) > > Q: What did Joerg say to his girlfriend at the restaurant > teble when they went out together to dine on the Valentine's? > > > > > > > > > > A: "What would you like to order, my sweet dear little fattie?" > > Regards, > Mikko >
Of course, in Finland sausage is considered a vegetable. ;) Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 USA +1 845 480 2058 hobbs at electrooptical dot net http://electrooptical.net
Reply by Joerg February 3, 20132013-02-03
Tim Wescott wrote:
> On Sat, 02 Feb 2013 17:50:59 -0800, Joerg wrote: > >> For a tester project I need a DDS source, should be a module but with >> some decent output power and if possible a display. SPI or RS232 style >> control would be nice. So far I only found this kind: >> >> http://www.amazon.com/SG1005-Signal-Generator-Source-Function/dp/ > B008N7M5KU/ref=sr_1_1?ie=UTF8&qid=1359855256&sr=8-1&keywords=SG1005+DDS >> Some comments are not so enthusing though: >> http://www.elecfreaks.com/279.html >> >> Can't find a manual for it or any decent info. Does anyone know where, >> or has a suggestion for a better module? Need 10kHz to 1MHz (higher >> would be nice) range, 2Vrms or so sine wave into a 50ohms load. Price is >> not so important, can be $100/module. >> >> Hacking is no problem, for example to get around a RS232/USB chip >> because I can't really use USB. Sine wave quality doesn't have to be >> super stellar, slight distortion would be ok. But I can't use a big boxy >> function generator since it has to be integrated in the tester. > > There are some DDS modules that are popular for amateur radio work; you > may want to search around using terms like "QRP" and "transmitter" or > "QRP" and "local oscillator". >
I looked in that market and most of the DDS are quite deeply embedded in a transceiver or receiver. Like this: http://www.nikkemedia.fi/juma-tx1/ I have even seen a DDS synthesizer in a tube amplifier somewhere.
> I know there's at least one QRP transmitter that uses a DDS as its > oscillator; that should give you 1 to 5 watts out, with perhaps a need to > modify an output filter to get down to the lower frequency you want. >
The filter usually doesn't have to be adjusted in a DDS unless the master clock or something like that is changed. -- Regards, Joerg http://www.analogconsultants.com/
Reply by Tim Wescott February 3, 20132013-02-03
On Sat, 02 Feb 2013 17:50:59 -0800, Joerg wrote:

> For a tester project I need a DDS source, should be a module but with > some decent output power and if possible a display. SPI or RS232 style > control would be nice. So far I only found this kind: > > http://www.amazon.com/SG1005-Signal-Generator-Source-Function/dp/
B008N7M5KU/ref=sr_1_1?ie=UTF8&qid=1359855256&sr=8-1&keywords=SG1005+DDS
> > Some comments are not so enthusing though: > http://www.elecfreaks.com/279.html > > Can't find a manual for it or any decent info. Does anyone know where, > or has a suggestion for a better module? Need 10kHz to 1MHz (higher > would be nice) range, 2Vrms or so sine wave into a 50ohms load. Price is > not so important, can be $100/module. > > Hacking is no problem, for example to get around a RS232/USB chip > because I can't really use USB. Sine wave quality doesn't have to be > super stellar, slight distortion would be ok. But I can't use a big boxy > function generator since it has to be integrated in the tester.
There are some DDS modules that are popular for amateur radio work; you may want to search around using terms like "QRP" and "transmitter" or "QRP" and "local oscillator". I know there's at least one QRP transmitter that uses a DDS as its oscillator; that should give you 1 to 5 watts out, with perhaps a need to modify an output filter to get down to the lower frequency you want. -- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com
Reply by Mr Stonebeach February 3, 20132013-02-03
On Feb 3, 5:29=A0pm, Joerg <inva...@invalid.invalid> wrote:
> Then I might a well just buy the bare chip, it's cheaper :-)
Q: What did Joerg say to his girlfriend at the restaurant teble when they went out together to dine on the Valentine's? A: "What would you like to order, my sweet dear little fattie?" Regards, Mikko
Reply by Joerg February 3, 20132013-02-03
Joerg wrote:
> langwadt@fonz.dk wrote: >> On Feb 3, 4:56 pm, Joerg <inva...@invalid.invalid> wrote: >>> langw...@fonz.dk wrote: >>>> On Feb 3, 4:29 pm, Joerg <inva...@invalid.invalid> wrote: >>>>> langw...@fonz.dk wrote: >>>>>> On Feb 3, 2:50 am, Joerg <inva...@invalid.invalid> wrote: >>>>>>> For a tester project I need a DDS source, should be a module but with >>>>>>> some decent output power and if possible a display. SPI or RS232 style >>>>>>> control would be nice. So far I only found this kind: >>>>>>> http://www.amazon.com/SG1005-Signal-Generator-Source-Function/dp/B008... >>>>>>> Some comments are not so enthusing though:http://www.elecfreaks.com/279.html >>>>>>> Can't find a manual for it or any decent info. Does anyone know where, >>>>>>> or has a suggestion for a better module? Need 10kHz to 1MHz (higher >>>>>>> would be nice) range, 2Vrms or so sine wave into a 50ohms load. Price is >>>>>>> not so important, can be $100/module. >>>>>>> Hacking is no problem, for example to get around a RS232/USB chip >>>>>>> because I can't really use USB. Sine wave quality doesn't have to be >>>>>>> super stellar, slight distortion would be ok. But I can't use a big boxy >>>>>>> function generator since it has to be integrated in the tester. >>>>>>> -- >>>>>>> Regards, Joerg >>>>>>> http://www.analogconsultants.com/ >>>>>> https://www.sparkfun.com/products/9169? >>>>>> you'd need a buffer but you said you didn't mind a bit of hacking >>>>> Then I might a well just buy the bare chip, it's cheaper :-) >>>> but then you'll need a pcb, xtal regulator, etc. and have to build it >>>> with this you just need a buffer amp. You don't have something laying >>>> around with ~3-4x gain that can drive 50R? >>> Oh, I can build it, just a simple amp. But another board to be roached >>> in. If it has to be that way then so be it. I'd also have to build an >>> LCD module, plus some sort of encoder for local control. >>> >> I see, if you don't have anything to control it with then it is a bit >> more work than just a buffer >> >> how about something like this: http://imall.iteadstudio.com/im120723003.html >> >> open source hard and software, even comes with a programmer if you >> want to >> do you own software >> > > Thanks! That looks like a very good candidate. Not sure why it needs 4W > of power but I can supply that. The display looks like the one on my > Nokia phone so should have a backlight. If not we'll just supply > flashlights :-) > > I don't like that open coil switcher inductor, makes for lots of EMI. > But this my home turf so I can deal with that. >
Someone demo'ed it on Youtube: https://www.youtube.com/watch?v=_yEtQFMJdtU Looks nice. The frequency dialing is weird through. CCW makes it go up, maybe the programmer is also designing faucets :-) I guess since the firmware is open one can correct for oddities like that. A bit concerning is the frequency instability mentioned here but that may have to do with the switch mode converter on there: http://blog.tkjelectronics.dk/2011/09/review-iemp-v1-0-simple-arduino-dds-signal-generator/ Instability is a showstopper for me but hopefully it's just a minor screw-up that can be corrected. -- Regards, Joerg http://www.analogconsultants.com/
Reply by Joerg February 3, 20132013-02-03
langwadt@fonz.dk wrote:
> On Feb 3, 4:56 pm, Joerg <inva...@invalid.invalid> wrote: >> langw...@fonz.dk wrote: >>> On Feb 3, 4:29 pm, Joerg <inva...@invalid.invalid> wrote: >>>> langw...@fonz.dk wrote: >>>>> On Feb 3, 2:50 am, Joerg <inva...@invalid.invalid> wrote: >>>>>> For a tester project I need a DDS source, should be a module but with >>>>>> some decent output power and if possible a display. SPI or RS232 style >>>>>> control would be nice. So far I only found this kind: >>>>>> http://www.amazon.com/SG1005-Signal-Generator-Source-Function/dp/B008... >>>>>> Some comments are not so enthusing though:http://www.elecfreaks.com/279.html >>>>>> Can't find a manual for it or any decent info. Does anyone know where, >>>>>> or has a suggestion for a better module? Need 10kHz to 1MHz (higher >>>>>> would be nice) range, 2Vrms or so sine wave into a 50ohms load. Price is >>>>>> not so important, can be $100/module. >>>>>> Hacking is no problem, for example to get around a RS232/USB chip >>>>>> because I can't really use USB. Sine wave quality doesn't have to be >>>>>> super stellar, slight distortion would be ok. But I can't use a big boxy >>>>>> function generator since it has to be integrated in the tester. >>>>>> -- >>>>>> Regards, Joerg >>>>>> http://www.analogconsultants.com/ >>>>> https://www.sparkfun.com/products/9169? >>>>> you'd need a buffer but you said you didn't mind a bit of hacking >>>> Then I might a well just buy the bare chip, it's cheaper :-) >>> but then you'll need a pcb, xtal regulator, etc. and have to build it >>> with this you just need a buffer amp. You don't have something laying >>> around with ~3-4x gain that can drive 50R? >> Oh, I can build it, just a simple amp. But another board to be roached >> in. If it has to be that way then so be it. I'd also have to build an >> LCD module, plus some sort of encoder for local control. >> > > I see, if you don't have anything to control it with then it is a bit > more work than just a buffer > > how about something like this: http://imall.iteadstudio.com/im120723003.html > > open source hard and software, even comes with a programmer if you > want to > do you own software >
Thanks! That looks like a very good candidate. Not sure why it needs 4W of power but I can supply that. The display looks like the one on my Nokia phone so should have a backlight. If not we'll just supply flashlights :-) I don't like that open coil switcher inductor, makes for lots of EMI. But this my home turf so I can deal with that. -- Regards, Joerg http://www.analogconsultants.com/
Reply by lang...@fonz.dk February 3, 20132013-02-03
On Feb 3, 4:56=A0pm, Joerg <inva...@invalid.invalid> wrote:
> langw...@fonz.dk wrote: > > On Feb 3, 4:29 pm, Joerg <inva...@invalid.invalid> wrote: > >> langw...@fonz.dk wrote: > >>> On Feb 3, 2:50 am, Joerg <inva...@invalid.invalid> wrote: > >>>> For a tester project I need a DDS source, should be a module but wit=
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> >>>> not so important, can be $100/module. > >>>> Hacking is no problem, for example to get around a RS232/USB chip > >>>> because I can't really use USB. Sine wave quality doesn't have to be > >>>> super stellar, slight distortion would be ok. But I can't use a big =
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> >>>> function generator since it has to be integrated in the tester. > >>>> -- > >>>> Regards, Joerg > >>>>http://www.analogconsultants.com/ > >>>https://www.sparkfun.com/products/9169? > >>> you'd need a buffer but you said you didn't mind a bit of hacking > >> Then I might a well just buy the bare chip, it's cheaper :-) > > > but then you'll need a pcb, xtal regulator, etc. and have to build it > > with this you just need a buffer amp. You don't have something laying > > around with ~3-4x gain that can drive 50R? > > Oh, I can build it, just a simple amp. But another board to be roached > in. If it has to be that way then so be it. I'd also have to build an > LCD module, plus some sort of encoder for local control. >
I see, if you don't have anything to control it with then it is a bit more work than just a buffer how about something like this: http://imall.iteadstudio.com/im120723003.htm= l open source hard and software, even comes with a programmer if you want to do you own software -Lasse
Reply by Joerg February 3, 20132013-02-03
langwadt@fonz.dk wrote:
> On Feb 3, 4:29 pm, Joerg <inva...@invalid.invalid> wrote: >> langw...@fonz.dk wrote: >>> On Feb 3, 2:50 am, Joerg <inva...@invalid.invalid> wrote: >>>> For a tester project I need a DDS source, should be a module but with >>>> some decent output power and if possible a display. SPI or RS232 style >>>> control would be nice. So far I only found this kind: >>>> http://www.amazon.com/SG1005-Signal-Generator-Source-Function/dp/B008... >>>> Some comments are not so enthusing though:http://www.elecfreaks.com/279.html >>>> Can't find a manual for it or any decent info. Does anyone know where, >>>> or has a suggestion for a better module? Need 10kHz to 1MHz (higher >>>> would be nice) range, 2Vrms or so sine wave into a 50ohms load. Price is >>>> not so important, can be $100/module. >>>> Hacking is no problem, for example to get around a RS232/USB chip >>>> because I can't really use USB. Sine wave quality doesn't have to be >>>> super stellar, slight distortion would be ok. But I can't use a big boxy >>>> function generator since it has to be integrated in the tester. >>>> -- >>>> Regards, Joerg >>>> http://www.analogconsultants.com/ >>> https://www.sparkfun.com/products/9169? >>> you'd need a buffer but you said you didn't mind a bit of hacking >> Then I might a well just buy the bare chip, it's cheaper :-) >> > > but then you'll need a pcb, xtal regulator, etc. and have to build it > with this you just need a buffer amp. You don't have something laying > around with ~3-4x gain that can drive 50R? >
Oh, I can build it, just a simple amp. But another board to be roached in. If it has to be that way then so be it. I'd also have to build an LCD module, plus some sort of encoder for local control. -- Regards, Joerg http://www.analogconsultants.com/