Muller Dynamo

[mondrasek]

@Mondrasek . Re Amateur Radio License . Here in the UK [ and I suspect almost all other countries ] the morse code requirement has been dropped .Personally I always loved using morse .

I recall hearing that too.  My Uncle is a HAM and was the one who bought me a licensing study guide book for my birthday one year around '78.  He told me later when they dropped the Morse requirement in case I wanted to have another go.  But I had little interest at that time since computers were a more interesting technology to me then.

Funny, I would have guessed you for more of a Semaphore type

M.

[xenomorphlabs]

Changing just the cabling results in a Vout before the FWBR that is just a mess of low voltage fluctuations with a very random pattern.  I believe this is simply due to the mismatch in coil and rotor mags.  The Vout of each coil should be cancelling, but due to the differences mentioned, one or the other can push a bit harder and register on the scope.  The Vout peaks were rarely as high as ~ 1 V.  In the previous bucking config this V would have been >30V ptp.

After the FWBR it was able to charge up the Dump Cap to a bit above .5 V over a long time and with no load.  Adding a load would kill that voltage immediately due to the very low level of current that was able to be pushed from the coils.

M.

This is my observations too so far, but i am no qualified HAM/RF guy to do any fancy tuning other than sweep frequency ranges and using a variety of series caps.

[mondrasek]

How does one determine the Power dissipated by an incandescent bulb?  I can measure VDCin, but R changes as the element heats up, right?  Is there some way to capture Iin without placing another current shunt resistor in series?

M.

[itsu]

Hi Mondrasek,

in your post nbr 4675, you say:

"In the previous bucking config this V would have been >30V ptp."


Well i guess that is when you really are in series or parallel ADDING config, NOT bucking config.


The trick is to get voltage/current out of the "bucking" config, which is the one where you initially will
get no (or as you say "a mess of low voltage fluctuations") voltage and current because they (almost) cancel each other out.

In this "cancel out" config/situation, which also has no cogging from Lenz under load, you need to tune for VARs as "Bolt"
tells us, but how this is done is still a mystery to many of us.

Knowledge of RF to tune the coils does not make sense to me as RF does not come into play here (RE is NO RF).

I am experimenting with (bifilar) pickup coils in all kind of bucking (and adding) modes (series/parallel) with capacitors (1 to 90 uF) in series and parallel, with and without resonance for weeks now, but have not seen any useable voltage/current coming from my coils.

Regards Itsu,   --... ...--

[chalamadad]

Hi Mondrasek,

in your post nbr 4675, you say:

"In the previous bucking config this V would have been >30V ptp."


Well i guess that is when you really are in series or parallel ADDING config, NOT bucking config.


The trick is to get voltage/current out of the "bucking" config, which is the one where you initially will
get no (or as you say "a mess of low voltage fluctuations") voltage and current because they (almost) cancel each other out.

This is what I was thinking. Tell me if I am wrong. In adding config I have seen the output voltage easily surpass the input voltage. In bucking one coilpair was 1 or 2 volts, but only if there was a different spacing between rotor and the coils. Evenly spaced it's getting close to zero.

@mo: If you are in adding config a load will slow down your rotor significantly. In bucking it shouldn't drop or just minimal. Also you can see the current rising if a load is attached, but I guess the latter is standard. But still we should have an eye on that since tuning under load was important.