Bedini SG

[ren]

If I use a Hall Effect device for the trigger then I do not need the trigger wire at all, correct?

Anyone have any luck with a particular Hall Effect sensor?

A Mouser part number would be great.....

Have a most excellent day...

Tj

Ive found you usually need a PNP with a hall. I think it has something to do with the small output of the hall. If you build the window motor half or full circuit you just have to replace the MPSAO6 with a PNP, there are other schematics out there with hall wiring for this. When you look for your hall check to see if it is unipolar and whether it is a latching type. Google if you need to, you can find some good data sheets on different types of halls.

Try and pick a hall that can take a bit of voltage. I found a nice one by allegro I think, rated for 24v.

[N O G]

4 Coil SSG For experienced SSG builders

Hi everyone haven't been on this forum for a while and this is where it all started for me here a while ago ,so time to give back a little. Here's one Multi-coil SSG recipe i put together .People are seeming to have problems building these so i added some info.Hope this helps

[tjnlsn255]

Part Number?

Thanks Ren,

Do you have a part number for the 24v Hall device and can I buy it from Mouser?

Have fun.....

Todd

[Rusl]

11-04-09_1927.jpg

this is my machine in just motor run setup

450>500 turns on coil, 22 26gauge. mild steal core made from small file set.
680ohm resistor only, and sod the pot, far more efficient than anything i seen.
not tested it till battery runs out but it went for well over 36 hour until i had to play with it.

it is going to charge batteries very soon, i like it

ps to ren. thanks for info site on current measurment. again

[gmeast]

solid state charger

Hi all,

I built the SG years ago ..when the news first came out about it. But now I'm building the solid state charger of Figure 33 on page 46 of the 'Circuits and Schemtics' book. I'm using the corrected schematic that came as a loose insert with the book.

Has anyone made this yet. It's a trifiler coil - and all of the wires are the same guage. It calls for #23 so I'm using #22 because I couldn't find #23. I ordered the parts, wire and stuff.

Is it acceptable to use 1/16" mild steel welding rod stuffed into the hole of a spool as the core? I've heard of folks stuffing additional iron filings in there too to fill the rest of the space ... is this last step (filings) necessary and is it critical enough to make the difference between working and not working as touted.

Thanks in advance,

Greg

[ren]

Hi Gmeast,

You may as well stick with the rods. Iron filings added wont make too much difference IMO. You can also omit the rods for a higher frequency. Perhaps make it so the rods are removable so you can test both ways.

@ Rusl. Good clean first build. Are they neos on the rotor? Air gap is HUGE! Could make some improvements there. Keep at it.

@ Todd. This one might work Mouser: 621-ATS137-PL-A-A

Or this one maybe 621-AH337-PL-A

If you have access to this place Allied Electronics - Electronic Components Distribution you could get the same one I used. It is part number SS443a. Unipolar Hall rated for 3.8v to 30v.

Here is some homework for you. If you do go ahead and decide to buy one, buy like 10 of them. Trust me on that

Allegro | Applications Note | Unipolar Hall-Effect Sensors

http://www.allegromicro.com/en/Produ...an/an27705.pdf

Regards

[gmeast]

charger

Hi Gmeast,
.................................................. ...........
You may as well stick with the rods. Iron filings added wont make too much difference IMO. You can also omit the rods for a higher frequency. Perhaps make it so the rods are removable so you can test both ways.
.................................................. ...........
Regards

Thanks Ren,

Greg

[ren]

Check out Rick new kit.

YouTube - Three Pole Monopole

[Rusl]

[QUOTE=ren;52242]Hi Gmeast,


@ Rusl. Good clean first build. Are they neos on the rotor? Air gap is HUGE! Could make some improvements there. Keep at it.


I thought so too thank you,

Not neos no, they tiny nuts and bolts holding bunch of CD's tightly together. had problem deciding on a rotor so i crafted one.
it spun for less than minutes when took that photo. a knife is shunting heat from core. huge air gap =no vibration at present state.
Improving it at every thought. chopping wires down, got hdd motor to try. etc.

kindest regards..............Rusl....... more pictures very soon thank you

[tjnlsn255]

Thanks for the Hall info Ren.... I will give it a try.....

Have fun....

Todd

[baroutologos]

My SSG, and questions of course!

Hi,

In order to introduce myself to forum and thread, i present you my humble Bedini SSG.

It is constrcuted as following:

rotor: bicycle wheel 18 magnets all north faces, double stacked
coil: 5 x 22 awg @ 300 ft, 25 agw @ 300 ft (trigger)
control circuit : 4 BD243C transistors, 4 x 10 ohms split ressistance, 1k pot
1N5408 diodes each battery having one (i used SCR pulsing for some time, same results)

runs optimally in 0.25 amps @ 12 volts
batteries:
charging
- brand new 6Ah much conditioned lead acid flooded type
- brand new 7.2Ah (newly acquired) gel cell.

primary:
-used bike battary 10Ah, with much conditioned on SSG, each time charged by regulated power supply
- for prolong conditioning i use regulated power supply via 10,000 uf @ 23volt cap for power smoothing

SPeaking of COPs
--------------------------
C20 rate charge/discharge followed, DC-to-DC converter used under fixed load
Best ever achieved so far (20th non stop continuous cyle or more) 50%

Questions
--------------------------
I have read about after some battery conditioning the COP can easily surpass 1 in electrical terms. (comparing primary battery draw and charging batteries load tests at same time, C20 rate followed)
Why mine did not?

The only deviation from suggested guidelines are the coil core. I COULD NOT find the RG60 rods over here. (Greece) I use welding rods flux coated. Of course flux has been striped away and rods have been painted.
My question is, does the core make such tremendous difference?

[tjnlsn255]

Battery Question...

Can the Primary Battery be 24 volts and the Charge battery still be 12 volts?

I only have three 7ah 12 volt batteries and I would like to try my SSG on 24 volts.... is that possible? It looks like the way that the two batteries are hooked up that if I put two 12 volt batteries in series for 24 volts as the Primary that would affect the single 12 volt battery as the Charge battery....

What do people do for the charge side that use a variable DC power supply as the Primary?

Any and all help please.....

Tj

[Mark]

Hi TJ

Yes you can run on 24 volts. Speed will increase and so will charging, you will also have to retune. Have fun. I've run 36 volts before until I had magnets flying all over the place. Make sure your magnets are secured!

[tjnlsn255]

Hi Mark,

And your Charge battery was still just 12 volts?

I guess that I need to be careful about how high the charge battery gets, right?

As the potential will now be to try and charge up to 24 volts?

Thanks for all the info....

The past is the past, the future has yet to come, and I am right smack in the present....:-)

Tj

[redeagle]

Has anyone built a bedini using relay coils? I have several relay's from something that I was going to try but ended up not doing. I am thinking about making a small multicoil bedini using them. maybe out of some knex parts to keep it light weight.