Successful TPU-ECD replication !

[MeggerMan]

Hi Peter,
Excellent news.

Are you sure that if all 3 DDS chips start with same master clock after a soft reset they will stay in Sync?
I can use a different DDS chip, it does not need to be the AD9833.

Regards
Rob

[z_p_e]

I'm eager to start winding once I see some confirmation of the initial results with RMS input current readings taken along the lines already suggested using filters and a 12V battery as the power source.  

Yes well put.

These test results so far are inconlusive.

I was going to draw up a diagram illustrating how the test setup should be to minimize interference to the instruments and meters, but there are already a few suggestions covering most of what I was going to suggest.

One or both of the meters (standalone and PSU) are giving erroneous readings. We should not be jumping to the conclusion that it is the PSU that is the one in error, nor the meter, but human nature sways us to choose the lower of the two.

Suggest the following to minimize interference to both the PSU and meters:

12VBat-->voltmeter-->currentmeter-->LCFilter(x3)-->RFshield-->DUT

This plattering noise can wreak havoc with all digital meters, and is evidently occuring here.

On the other side of the coin (choosing the higher of the two possible readings), 42V X 3.6A = 150W, so of course the bulb will glow brightly. And 30V X 3.6A = 108W, still enough for a bright bulb.

The PSU is supposed to be capable of only 30V, but with noise wreaking havoc inside the PSU, it could be getting "fooled" into putting out much more. All PSU units start with a higher voltage to allow for regulation, and 42V would not be an unreasonable amount.

Darren

[chrisC]

Hi Rob:

Please count me in for a couple of your DDS boards when done. Much appreciate your role in this effort.

Regards

chrisC

[hartiberlin]

I'm eager to start winding once I see some confirmation of the initial results with RMS input current readings taken along the lines already suggested using filters and a 12V battery as the power source. 

Yes well put.

These test results so far are inconlusive.

I was going to draw up a diagram illustrating how the test setup should be to minimize interference to the instruments and meters, but there are already a few suggestions covering most of what I was going to suggest.

One or both of the meters (standalone and PSU) are giving erroneous readings. We should not be jumping to the conclusion that it is the PSU that is the one in error, nor the meter, but human nature sways us to choose the lower of the two.

Suggest the following to minimize interference to both the PSU and meters:

12VBat-->voltmeter-->currentmeter-->LCFilter(x3)-->RFshield-->DUT

This plattering noise can wreak havoc with all digital meters, and is evidently occuring here.

On the other side of the coin (choosing the higher of the two possible readings), 42V X 3.6A = 150W, so of course the bulb will glow brightly. And 30V X 3.6A = 108W, still enough for a bright bulb.

The PSU is supposed to be capable of only 30V, but with noise wreaking havoc inside the PSU, it could be getting "fooled" into putting out much more. All PSU units start with a higher voltage to allow for regulation, and 42V would not be an unreasonable amount.

Darren

I must agree with Darren.
It could be, that the meters are just getting fooled by the big RF spikes and that the
power supply put out really more.
So it was also very suspicious, that the digital ampmeter did show lower and lower
amps input but the light bulb stayed at the same brightness..

Hmm... Maybe just the batteries on this digital ampmeter were almost empty ?
Then these things also happen as I have experienced my self often when the
battery of the DVM is nearly empty...

As Jason seems not to have used any blocking caps and chokes as lowpassfilters
directly at the power supply, the current could have really been this big.
So my advice, never use digital meters with pulse measurements and only use
analog meters to measure the average input current and always use LC lowpassfilters before going into the circuit
and only measure the input infront of these LC lowpassfilters.

Regards, Stefan.

[gn0stik]

I'm eager to start winding once I see some confirmation of the initial results with RMS input current readings taken along the lines already suggested using filters and a 12V battery as the power source. 

Yes well put.

These test results so far are inconlusive.

I was going to draw up a diagram illustrating how the test setup should be to minimize interference to the instruments and meters, but there are already a few suggestions covering most of what I was going to suggest.

One or both of the meters (standalone and PSU) are giving erroneous readings. We should not be jumping to the conclusion that it is the PSU that is the one in error, nor the meter, but human nature sways us to choose the lower of the two.

Suggest the following to minimize interference to both the PSU and meters:

12VBat-->voltmeter-->currentmeter-->LCFilter(x3)-->RFshield-->DUT

This plattering noise can wreak havoc with all digital meters, and is evidently occuring here.

On the other side of the coin (choosing the higher of the two possible readings), 42V X 3.6A = 150W, so of course the bulb will glow brightly. And 30V X 3.6A = 108W, still enough for a bright bulb.

The PSU is supposed to be capable of only 30V, but with noise wreaking havoc inside the PSU, it could be getting "fooled" into putting out much more. All PSU units start with a higher voltage to allow for regulation, and 42V would not be an unreasonable amount.

Darren

I must agree with Darren.
It could be, that the meters are just getting fooled by the big RF spikes and that the
power supply put out really more.
So it was also very suspicious, that the digital ampmeter did show lower and lower
amps input but the light bulb stayed at the same brightness..

Hmm... Maybe just the batteries on this digital ampmeter were almost empty ?
Then these things also happen as I have experienced my self often when the
battery of the DVM is nearly empty...

As Jason seems not to have used any blocking caps and chokes as lowpassfilters
directly at the power supply, the current could have really been this big.
So my advice, never use digital meters with pulse measurements and only use
analog meters to measure the average input current and always use LC lowpassfilters before going into the circuit
and only measure the input infront of these LC lowpassfilters.

Regards, Stefan.

Sure could be...

Or it could be that it's doing what's been claimed from the beginning.

Your guy's tests should confirm or refute this however.

Anxious to see your results guys!!!