Solid state Bedini charger from John Peters

[crowclaw]

Thank you so much for this information.  I have found an article when I ran a search based on your comment: http://www.panaceauniversity.org/Bedini%20Monopole%203%20Group%20Experiment.pdf
As well as a number of other links that I will investigate

Hi Niofox,

Have been watching this thread for some time with interest. I thought I'd nip in here just to explain my present experiment. I'm using 4x BSP452 mosfet high side switch devices with the option to parallel up. My supply source is a variable regulated bench supply set at 12 volts. The outputs are all commoned and connect to one side of a reclaimed power supply choke (2R2 DC impedance_ laminated core) inductance not known. The remaining leg of the choke goes to common -ve or ground of supply. The mosfet is pulsed via a common 555 astable circuit running at 1.7KHz @ 51% mark_space ratio. The positive of the charge battery is connected to the common -ve line, while the negative of the charge battery is connected via the anode of a UF5408  to the switched side of the choke. This arrangement works extremely well on Nicad's and 12volt Lead Acid. Now... I have broken all the rules for charging these while experimenting on various circuits so I recon I have probably damaged my present 12 volt cell! However the results can vary somewhat, I had to discharge several times over until a decent recharge voltage could be held... although the present one keeps dropping to rest at 10.5v
Nicad cells (9volt PP3 type) I have found seem to be critical to both frequency and mark/space to find the best/quickest charging rate. Again for me... 1.7KHz seems to give the best results. Experiments on going

[niofox]

Here's the setup I now use (simplest is best I always say) tweaked at 330ohms (only cuz I don't have a large selection to find tune more - I need it around 366 or something).
Currently I only have 1 bifilar coil (core doesn't make any difference as far as I can tell) unlike that image which shows a scaled up design.

Not sure if I need to scale much further for the small number of batteries I'm charging though.  I switched the charging battery for a 400v/220uf cap and gave it a go to get an idea of the kind of potentials I am getting here.  The cap got up to ~250v then dipped to 220 sharply (like almost instantly to the point where I'm not even sure 250 is the real peak) and started bleeding off before I turned off the charger.  This happened in about 2 to 3 seconds.  The neon light came on after 1 second or less.

Discharging the cap was fun ^.^ big big snap and spark.  I suspect I may be getting a higher potential than just 250v, alot higher.  The cap is swollen and I'm thinking it can't get to its original peak anymore.  I will try to get a larger/less damaged cap from an old crt and try this again.

-= More battery observations =-
So far I have been charging batteries in singles.  Getting to the cut off point is happening a lot faster than they relax now.  I will have to throw a 3rd battery into rotation or alternatively charge them in parallel again.  In light of the high potentials I found with the cap, I think parallel charging would be best.  Charging should be slow enough that the heavier ions have time to move within chemical solution and take longer to get to the cut off

Another thing is ... batteries have their own personalities man.  I have 4 car batteries and each one is different in its own way.
#1  Rests at 12.10, charges to 14.5, slowly coming back to rest at a higher 12
#2 Rests at 10.1, charges to 15.x (it jumps around up there) then comes quickly back to rest around 10.x (I changed the water on this)
#3 Rests at 10.5, charges to 12.x then comes back to 10.5 (also changed the water on this one.  I think they are ruined for good)
#4 Rests at 12.12, charges to 12.5, slowly coming back to rest at 12.12 (This is the most normal one out of the bunch, I call him bob ... j/k)

I am rotating #1 and #4 currently
I had a 5th but I gave it to a friend to test in his car after I restored it from ~6.75v or so to a resting ~12.12v over the weekend

More to come later!

[SkyWatcher123]

Hi folks, Hi niofox, it looks like in the circuit you posted that its missing a resistor between the collector and base, my circuit has a 15kohm though usually a 20k is used. Though if your getting this circuit to oscillate without it, i sure wonder how.
peace love light
Tyson

[Thaelin]

@ niofox:
   On the part where you "replaced the water" in two of your batteries, did you use just water or 10% sulfuric acid mix?  When you buy a new battery, it has a 10% mix in it. And where ever you put the old mix at, you had better flush it good and maybe even add a bit of baking soda to neutralize  it.

thay

[niofox]

@ niofox:
   On the part where you "replaced the " in two of your batteries, did you use just water or 10% sulfuric  mix?  When you buy a new battery, it has a 10% mix in it. And where ever you put the old mix at, you had better flush it good and maybe even add a bit of baking soda to neutralize  it.

thay

No I just put it some filtered drinking water.  The first battery I only dumped out about 1/2 of what was in there, the 2nd I dumped it all.  In both cases it doesn't seem to have helped, but actually made matters worse.

The only reason I tried it was
1: I read on the forum somewhere that someone did this and claimed it made it better
2: The 1st battery I tried it with rested at 10v so it had problems and that was just a last resort before I declared it useless.  The 2nd battery rested around 11.25 or so no matter how many times I ran it through the charger so I tried it with that one too

About the baking soda thing ... I didn't know about that until a friend told me the other day >.>
Not even weeds grow in the patch I threw the stuff onto anymore.  They seem to be creeping back in slowly ... but its kinda like if you used some REALLY strong weed killer.  I wonder if they use acid in those things?