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Old 28th March 2008, 09:28 AM   #21
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The DC kit is no longer available.

I will resume supply of the AC kit after vintage but once the existing stock is exhausted there will be no more.
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Old 1st April 2008, 06:29 PM   #22
karvid is offline karvid  Sweden
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Quote:
Originally posted by Mark Kelly
The DC kit is no longer available.

I will resume supply of the AC kit after vintage but once the existing stock is exhausted there will be no more.

What is the price for the AC-kit ?

Does it change the power frequence as a sinus shaped profile?

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Old 1st April 2008, 09:26 PM   #23
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The kit is $90.00 plus shipping ($5.00). It will cost you about another $200 minimum to complete and it is intended for expert builders only. IT IS NOT SUITABLE FOR BEGINNERS, if you have to ask me dumbass questions I will charge you for time spent answering.

It produces a very nice sine wave (distortion is around -60dB ) at any frequency required, minimal step between frequencies is around 200 ppm (eg 0.01 Hz at 50 Hz), precision is 50 PPM (set by the crystal, if you buy a more expensive crystal you get better precision).

Phase amplitude and phase angle are also independently adjustable. I believe it is the only kit ever to offer all these features.
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Old 1st April 2008, 09:31 PM   #24
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What doesn't it include that you have to purchase separately from the kit?
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Old 1st April 2008, 09:39 PM   #25
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It's what Jim Hagerman calls a half kit, I supply the boards, a few hard to find parts, the instructions and a BOM drawn on DigiKey.

You supply the components, a case and the battery and charger (or power supply, your choice).

It's cheaper and easier this way, I don't have to spend hours counting components.
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Old 2nd April 2008, 06:55 PM   #26
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Quote:
Originally posted by Mark Kelly

It produces a very nice sine wave (distortion is around -60dB ) at any frequency required, minimal step between frequencies is around 200 ppm (eg 0.01 Hz at 50 Hz), precision is 50 PPM (set by the crystal, if you buy a more expensive crystal you get better precision).

Phase amplitude and phase angle are also independently adjustable. I believe it is the only kit ever to offer all these features.
Hi Mark,

Interesting specs. Is this an analogue one or a digital one? Currently I am working on a mcrocontroller one using DDS techniques but that is, as usual, a 5-year project.

Cheers
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Old 2nd April 2008, 10:24 PM   #27
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The design uses both analogue and digital techniques, I want digital precision but analogue silence.

I have a design using an AD two channel DDS chip ready to go but I have been waiting over a year for some software that I commissioned (it was meant to take 6 weeks).

If you can program a uC to talk to the DDS chip and an LCD, please PM me through this board, I am happy to pay for your services.
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Old 2nd April 2008, 10:25 PM   #28
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You can pm through this board?
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Old 3rd April 2008, 02:35 PM   #29
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You can pm through this board Mark ?

thanks Walter
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Old 3rd April 2008, 05:37 PM   #30
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Hi Mark,

I am not using one of the AD DDS chips but implemented de DDS algorithm in software using a 32 bit phase accumulator. And for the output I am using the micro controllers (Atmel MegaAVR 168) internal PWMs. For that I am using noise shaping to get 16 bits amplitude resolution. It is just in a very rudimentary state and I have not much time for it at the moment. Mid next year I hope to have a running PCB for it.

Cheers
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