Bedini SG

[blackchisel97]

Coil specs: trigger coil AWG#26 , All 8 power coils AWG#23
Wire length : about 450 turns each
Magnets are ceramic. That's fine

"why are some of your on times longer than others?" this may be due to the slightly different Gauss value of your magnets.
Well i don't know the exact reason yet.

Yes power supply is directly connected to energizer.

"you should use a large/huge LAB on the front end."
I didn't get that ..............LAB?? Lead Acid Battery

I think i need to tune my circuit a little..

You may need to adjust base resistors for each transistor. What values are they?
As minoly suggested:
You may want to put large cap across the input to match the impedance of PS and circuit. Something in 20,000 - 50,000uF range, or use a large battery which will match impedance better than PS may.

Vtech

[salman144]

After tunning

Hi,

transistor base resistors are all 470ohm.
I have a variable resistor of 1K connected in series(in place of 22 ohm in schematic) with the trigger coil.
I changed that resistor to tune the circuit for minimum input current and maximum speed of the wheel.
I noticed that the speed increased and input current decreased with increasing the trigger coil resistance.
The optimum value on which i tuned it is around 300ohm.
Now the input current is about 430mA and battery charging current is 200mA.
And speed has improved pretty good.

Attached is the waveform that i get just before the 1n4008 diode (collector of BD243C) while the 7.2Ahr battery is connected.
Is 7.2Ahr good i mean huge or i need more higher rated one..?
I have connected a 12V,4A adapter (instead of power supply) at the input side.
Will the capacitor still be necessary...?
What if i connect another battery at the input.

[minoly]

Hi,

transistor base resistors are all 470ohm.
I have a variable resistor of 1K connected in series(in place of 22 ohm in schematic) with the trigger coil.
I changed that resistor to tune the circuit for minimum input current and maximum speed of the wheel.
I noticed that the speed increased and input current decreased with increasing the trigger coil resistance.
The optimum value on which i tuned it is around 300ohm.
Now the input current is about 430mA and battery charging current is 200mA.
And speed has improved pretty good.

Attached is the waveform that i get just before the 1n4008 diode (collector of BD243C) while the 7.2Ahr battery is connected.
Is 7.2Ahr good i mean huge or i need more higher rated one..?
I have connected a 12V,4A adapter (instead of power supply) at the input side.
Will the capacitor still be necessary...?
What if i connect another battery at the input.

7.2 ah divided by 20 = 360mA draw max if you are currently drawing 430mA, you have exceeded the C20 rate and will slowly kill the primary.

two bigger reasons for a large LAB on the front:
IMPEDANCE
and
staying w/in tunning range. - your charging battery will already throw the tunning off because the impedance will change as it's voltage rises. the bulb on the trigger should help w/ this, however, you do not want the front end to take a dive at the same time - the bulb might not be enough to servo the oscillator.
remember "The Tortoise and the Hare".
just because your wheel spins fast does not mean it will charge the battery fast.
your battery will charge on it's own time, get to know it, the more runs you put it through, the better it will respond - why....
did you search any of JB's posts on that link yet...

Patrick

[salman144]

7.2 ah divided by 20 = 360mA draw max if you are currently drawing 430mA, you have exceeded the C20 rate and will slowly kill the primary.

two bigger reasons for a large LAB on the front:
IMPEDANCE
and
staying w/in tunning range. - your charging battery will already throw the tunning off because the impedance will change as it's voltage rises. the bulb on the trigger should help w/ this, however, you do not want the front end to take a dive at the same time - the bulb might not be enough to servo the oscillator.
remember "The Tortoise and the Hare".
just because your wheel spins fast does not mean it will charge the battery fast.
your battery will charge on it's own time, get to know it, the more runs you put it through, the better it will respond - why....
did you search any of JB's posts on that link yet...

Patrick

I didn't connected a bulb on trigger....
Do you mean that i should tune the circuit to take input current according to c20 rate of the charging battery...? And speed does not matters..?

"why....did you search any of JB's posts on that link yet.."
I am on it...takes time to search through lots of random stuff.

[blackchisel97]

I didn't connected a bulb on trigger....
Do you mean that i should tune the circuit to take input current according to c20 rate of the charging battery...? And speed does not matters..?

"why....did you search any of JB's posts on that link yet.."
I am on it...takes time to search through lots of random stuff.

No, what he meant was to respect C20 for primary battery if you decide to use one to power you circuit. The one you have - 7.2Ah is not suitable as such.
What matters is a tuning spot where SSG becomes most efficient. Best charging can be found and moderate, not the highest speed. Remember, this is an energizer not a motor and we're not after highest rpm but balance between rpm and least current draw. You may get your wheel up to 350rpm but best charging may occur at 200. Just an example.


Vtech

[minoly]

I didn't connected a bulb on trigger....
Do you mean that i should tune the circuit to take input current according to c20 rate of the charging battery...? And speed does not matters..?

"why....did you search any of JB's posts on that link yet.."
I am on it...takes time to search through lots of random stuff.

Dave at BM3 just uploaded a PDF in the files at BM3 that has all JB and Peter L.'s posts.
It's an automatic membership there if you are not already. this is the direct link to his pdf:
http://f1.grp.yahoofs.com/v1/oO7mTWZ...B%20Digest.pdf
if you need to join:
Bedini_Monopole3 : Bedini_Monopole3

you want to tune your circuit and then choose the battery according to the draw. for what you have I would just start w/ 100Ah on the front. the alternative is to put a large cap on your power supply. but the circuit will see the difference between the two. Bit's has a somewhat complicated but very workable battery swapper DC to DC converter that allows him to work w/ smaller batteries. however IMHO the draw on those is still to high for any long term solution. still very nice for large batteries as well.

I have a very similar coil to yours 9 power windings 1 trigger winding same awg 265'. it charges best between 1amp to 2 amps depending on the battery being charged.
hope this helps

Patrick

[salman144]

Hi,

Yes i am a member of BM3. But
"http://f1.grp.yahoofs.com/v1/oO7mTWZ...B%20Digest.pdf"

this link isn't working.

[salman144]

90Ahr

Ok ,
Now i have connected 90Ahr battery on the front and tuned the circuit.
At the optimum spot (i think it is but i maybe wrong) the circuit is taking input
current of about 600mA.
output current to battery is 300mA.
RPM of wheel is about 200.

[ren]

Coil specs: trigger coil AWG#26 , All 8 power coils AWG#23


"you should use a large/huge LAB on the front end."
I didn't get that ..............LAB??

I think i need to tune my circuit a little..

LAB = Lead Acid Battery.

[minoly]

Hi,

Yes i am a member of BM3. But
"http://f1.grp.yahoofs.com/v1/oO7mTWZ...B%20Digest.pdf"

this link isn't working.

try this:
http://tinyurl.com/3w5rm8d

[salman144]

try this:
http://tinyurl.com/3w5rm8d

Noops this too not working..it says Document could not be found.
Can you attach that pdf file here with your post plz..

[blackchisel97]

Ok ,
Now i have connected 90Ahr battery on the front and tuned the circuit.
At the optimum spot (i think it is but i maybe wrong) the circuit is taking input
current of about 600mA.
output current to battery is 300mA.
RPM of wheel is about 200.

This sounds about right. Try not to have A - meter connected permanently on the output side unless it is a clamp type.


V

[salman144]

This sounds about right. Try not to have A - meter connected permanently on the output side unless it is a clamp type.


V

No i didn't have meter connected permanently. I just check after an hour or so and voltage is increasing .....In the morning battery was at 10.6V and now it is showing 11.98V while connected.

[minoly]

Noops this too not working..it says Document could not be found.
Can you attach that pdf file here with your post plz..

I would if it was mine. Links work for me from a diff computer even. last try - this is a link to his folder:
http://tech.groups.yahoo.com/group/B...ion/Dave%20Sw/
otherwise go to the files section then experimenters files then Dave Sw.

Patrick

[blackchisel97]

I would if it was mine. Links work for me from a diff computer even. last try - this is a link to his folder:
http://tech.groups.yahoo.com/group/B...ion/Dave%20Sw/
otherwise go to the files section then experimenters files then Dave Sw.

Patrick

Link works for me after I log in.


Vtech