Successful TPU-ECD replication !

[ronotte]

Hello Otto,

it happens that in my new 6" ECD I have a parallel wind secundary (actually I have 2 secundarys). Till now I have not had time to probe it to see what's on it. I'll do it this evening. Of course the secondary is according the previous specs.....but let's see..
I'll report of course the results.

Roberto

[otto]

Hello all,

@Dutchy

yes, I can try to measure the amps from my mains but I have to tune a little my frequency because of my huuuum noise. I dont know if this nois is from my loudspeasker in the radio or from my power supply. I had no time to see whats going on with my newest setup.

@Roberto

If you have 2 secondaries try what I sayd: everything connected as usual exept the bulb. This bulb connect to the second secondary and see with your scope the sine waves. Make a good frequency mix and when the bulb shines measure the frequency. It should be at arround 170 - 190kHz.

Otto

[MeggerMan]

@Chrisc

Thank you for posting the DDS-20 kit. I sure would love to see your kit running. Please let us know if the output driver will drive the Control Coils directly or do you still need special fast switching output drivers?

Also, are you in Europe or the UK where you can buy these parts. Apparently there is no distributor in the US.

No, it needs to drive a mosfet driver then mosfet.
I tried to drive the mosfet directly but I think it overloads the output stage and it shuts down at the higher frequencies, say 5MHz.

Yes, I am in the UK, the kit was purchased from ELV in Germany, you should be able to order it for the US too.
http://shop.elv.de
Search for DDS 20 or 6847138
The kit does not include the AD811 so you can buy that from them or like I am doing, buy it from somewhere cheaper.
Its an easy kit to build and if you do decide to go for it I can help out if you get problems.
I have translated most of the manual now in English.
Rob

[z_p_e]

@Darren,

yes it's probably a typo...sorry. For sure I'll double check it today and let you know. Of course I'll measure the bulb hot & warm resistance, please specify how you want me to measure it's capacitance: do you mean against ground?

For the Mobius I could also measure its capacitance between the two wires and against the ground...what do you suggest?

Roberto

@Darren,

here are the correct values:

Prymary: 0.023 mH
Secundary: 0.22mH

Cold bulb Resistance = 59.6 Ohm
Hot bulb Resistance = 420 Ohm  (similar light emission)

regards

Roberto

Thanks Roberto.

So to summarize and collect all info:

Primary: 0.5mm wire (24 AWG), 23uH, 0.5 Ohm, 4.2m

Secondary: 0.35mm wire (27 AWG), 220uH, 3 Ohm, 10.5m

Bulb: 60W, 230V
Bulb resistance Cold: 59.6 Ohm
Bulb resistance Hot: 420 Ohm (when operating in the ECD?)

Inter-coil capacitance: 485pF

Mobius inter-loop capacitance: 74pF

So if you can measure any inductance in the bulb, that would be great. If it is too small to measure, then that is ok too.

IMO, the capacitance contributed by the bulb between ZERO and PHASE should be extremely small. Let's not bother with that. The only way I know to measure it anyway, would be to see the bulb's self-resonant frequency, then calculate the C value from the known L (if it can be measured).

Thank you for the mobius and inter-coil capacitances. I will be incorporating them in the model.

Regards,
Darren

[Hoppy]

Hello all,

@Clive,

I can only say that I cant exact measure the amps because I havent the needed equipment.
Of course, its totally clear that with my analog meter I cant measure the input and output power.

I will ask Roberto if he can make this job. I hope he has such meters and a battery.

Otto

If you cannot measure estimate the input power, then how do you know what you what energy you are converting with your TPU?

You only need a 12V battery, an analoque meter, and a pi filter comprising of an inductor and two caps. Roberto should be able to set this up easily.

Clive