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Search: Posts Made By: Groundloop
Forum: Inductive Resistor 12-14-2009, 11:12 AM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Michael John Nunnerley, Just change your...

Michael John Nunnerley,

Just change your output transformer to give out approx. 15 volt
instead of 230 volt.

Alex.
Forum: Inductive Resistor 11-17-2009, 08:15 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Luc, May I add that I also will receive the...

Luc,

May I add that I also will receive the same core as seen in the videos,
together with the silver plated, Teflon insulated, solid copper wire. So
my Torroid transformer will be an very close...
Forum: Inductive Resistor 11-08-2009, 04:15 AM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Rosemary, Not quite right. I did test coils...

Rosemary,

Not quite right. I did test coils BOTH at the LOAD connector and then at
the SHUNT connector. When I tested at the LOAD connector then
the SHUNT connector was short circuit with a...
Forum: Inductive Resistor 11-07-2009, 10:33 AM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Rosemary, My tests was to see if I could get...

Rosemary,

My tests was to see if I could get a 12 Volt 90 amp, lead acid battery
to charge. The first test was with an air core coil, 1,4mm enameled
copper wire, coil inner diameter 10mm, 32...
Forum: Inductive Resistor 11-07-2009, 07:03 AM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Harvey, Alive and kicking. :-) My main...

Harvey,

Alive and kicking. :-) My main problem is spare time right now. I have been
very busy (and still are) with job related research, design and building
of various circuits. I hope to find...
Forum: Inductive Resistor 10-09-2009, 12:20 AM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Harvey, I will look into your proposed...

Harvey,

I will look into your proposed circuit this weekend and see what I can do.

Alex.
Forum: Inductive Resistor 10-08-2009, 01:53 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Rose, I have a 20MHz two channel O-scope, a...

Rose,

I have a 20MHz two channel O-scope, a 20MHz frequency counter, a 1300MHz
spectrum analyzer and some DVMs.

So if this is enough to do some testing for Harvey, just let me know.
(No need...
Forum: Inductive Resistor 10-08-2009, 01:31 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
@Witsend, My contribution so far has been...

@Witsend,

My contribution so far has been using time and money to make PCBs
for the circuit. I guess Luc still has some left?

My time is limited and I can't promise any extensive testing. The...
Forum: Inductive Resistor 10-07-2009, 02:35 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Harvey, No, when the oscillator runs on a...

Harvey,

No, when the oscillator runs on a bipolar transistor then there is no sharp
transients. There is NO problem to run a self triggered osc. on a
hexfet transistor, though. If I get time...
Forum: Inductive Resistor 10-07-2009, 06:00 AM
Replies: 3,433
Views: 396,950
Posted By Groundloop
FuzzyTomCat and All, Congratulation for...

FuzzyTomCat and All,

Congratulation for doing a very good job. :-)

If there is an solution to find even better "voltage spike" capturing methods
then I'm sure we can find them.

Groundloop.
Forum: Inductive Resistor 10-04-2009, 01:12 AM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Ash, When designing radio frequency...

Ash,

When designing radio frequency circuits, one use coils with Iron or Ferrite
trimmers. That way one can adjust the coil to the correct value.

A Ferrite rod or soft Iron rod inserted partly...
Forum: Inductive Resistor 10-03-2009, 01:18 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Free running oscillator test

All,

I wanted to see if a wire wound resistor was able to oscillate at all and
also at what frequency it would oscillate at.

So I designed this circuit:...
Forum: Inductive Resistor 10-03-2009, 12:39 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Harvey, Tanks for the explanation. I haven't...

Harvey,

Tanks for the explanation. I haven't designed much RF before so this is
new to me. I mostly design digital electronic. Is is good to have bright
minds around. I'm terrible at math. :-)
...
Forum: Inductive Resistor 10-03-2009, 05:48 AM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Harvey, Did not go so well. I ended up using...

Harvey,

Did not go so well. I ended up using a 10uF 650V metallized polypropylene
(MKP) +/-5% capacitor in parallel with the load resistor.
At 6,5uH the resulting parallel LC resonance should...
Forum: Inductive Resistor 10-03-2009, 03:22 AM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Harvey, I think you are right about the...

Harvey,

I think you are right about the right hand sideband of a typical fundamental
centered below the 10KHz starting point. That was my impression also.

I'm currently running the circuit at...
Forum: Inductive Resistor 10-02-2009, 02:50 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Harvey, I cranked up the switch input...

Harvey,

I cranked up the switch input voltage to 24VDC and made some new
scans from 10KHz to 200 MHz. You can download the zipped images
at http://home.no/ufoufoufoufo/rfSweep0_200.rar

I did...
Forum: Inductive Resistor 10-02-2009, 11:13 AM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Harvey, I will set up the test again and run...

Harvey,

I will set up the test again and run sweeps up to 1,3GHz. That is the
maximum frequency scan I can do. Is this high enough? But it will take
some time because I can only cover approx....
Forum: Inductive Resistor 10-02-2009, 10:27 AM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Harvey, The scan was run in two passes, the...

Harvey,

The scan was run in two passes, the first detected the background radiation
(in green) the next with the RA circuit running (in red). That way you know
how much background RF there is....
Forum: Inductive Resistor 10-01-2009, 10:35 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
RF from the circuit

All,

Today I did a test to see how much radio frequency energy there was
radiated from the RA circuit.

Circuit version : http://home.no/ufoufoufoufo/anc_revB_sch.gif
Resistor: GRF20/100 10R...
Forum: Inductive Resistor 09-25-2009, 07:38 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
@eternalightwithin, The 1N4004 is there to...

@eternalightwithin,

The 1N4004 is there to block the power to the 555 in case the operator
connects the polarity the wrong way around. I was not sure how much
power (read milli amps) the 555 was...
Forum: Inductive Resistor 09-25-2009, 06:00 AM
Replies: 3,433
Views: 396,950
Posted By Groundloop
@eternalightwithin, The heat sink is made...

@eternalightwithin,

The heat sink is made by:

Fischer Elektronik
Type: SK 129/ 50,8/ STS
Country: Germany
Size: 55X43X25 mm

f.cool (http://www.fischerelektronik.de/index.php?id=114&L=1)
Forum: Inductive Resistor 09-13-2009, 09:37 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Poynt99, Yes, the firm offers thermal models...

Poynt99,

Yes, the firm offers thermal models for PSPICE.

They also do:

snip
"Custom designed resistors and assemblies are
available on request.
Details like wire configuration, creepage...
Forum: Inductive Resistor 09-13-2009, 08:39 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Point99, The 10 Ohm resistor: GRF20/100 ...

Point99,

The 10 Ohm resistor: GRF20/100

The firm: Danotherm Electric A/S

Found here:
Tubular Resistors; Vitreous Enamelled - Danotherm A/S...
Forum: Inductive Resistor 09-13-2009, 07:17 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Group, My first test with my RA replica did...

Group,

My first test with my RA replica did not turn out well. The ON time
was so high that the transistor heated too much. At 8 volt input
the circuit pushed 10 watt into the resistor. I'm...
Forum: Inductive Resistor 09-04-2009, 12:10 PM
Replies: 3,433
Views: 396,950
Posted By Groundloop
Done soldering

Hi Group,

Finally, my RA circuit is soldered and ready to be tested.

http://home.no/ufoufoufoufo/rasolder02.gif

The heat sink to the right is my 0,25 Ohm 1% accuracy shunt resistor.
(This...
Showing results 1 to 25 of 30

 

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