Bedini SG

[dambit]

I found that I have to retune the energizers if I use batteries instead, probably due to an impedance difference.



Michel

I have found that too, although the adjustment is only a small one. With mine I have found that if I tune it for the power adapter as the input, when it does run off of batteries as the input the spikes are the same voltage anyway, so I can live with that.

My new device will not be run using mains power (well not all the time) so I will have a switch that allows me to select the input voltage and type. ie mains / battery, or 12V / 24V . This will allow me to use it for other things and not just the pool.

Cheers,

Steve.

[kick-bak]

Impedance question

I'm a bit lost on this.
I have a bifilar coil and and a power coil on my SG
Coils..
Bifilar Trigger = 21 ohm
Bifilar power = 9 ohm
Power2 = 8 ohm

When reading up about multi coils it says I need to match the impedance of the coils so would this mean I need an 12 ohm plus 13 ohm resistor values to match the coils ?
These 2 coils run on seperate transistors but use the same trigger signal

Thanks

[Guruji]

Pot is burning

I am trying to turn a pulley on a car alternator with a bedini circuit.
The thing is that it cannot turn cause it's a bit hard to turn.I am trying to increase weight on rotor for torque.Maybe it will turn when I balance weight to push magnets.
Another thing the pot is burning out don't know why?
I think it's better to work this way to charge a bank.
Any help please about the pot?
Thanks

[dambit]

I use higher wattage pots in my circuits. 5 Watts is the strongest I have at the moment. I find that I need them when building and tuning multi-coil circuits. The 0.5 watt pots are pretty much useless when you start to add more coils.

The other thing is that the bedini circuit is not designed for torque. Unless (in my opinion) some serious mods are made to the design you will not run a car alternator with it. They are hard enough to turn with your hand (when pluged in) let alone with an SG.

Cheers,

Steve

[dambit]

I'm a bit lost on this.
I have a bifilar coil and and a power coil on my SG
Coils..
Bifilar Trigger = 21 ohm
Bifilar power = 9 ohm
Power2 = 8 ohm

When reading up about multi coils it says I need to match the impedance of the coils so would this mean I need an 12 ohm plus 13 ohm resistor values to match the coils ?
These 2 coils run on seperate transistors but use the same trigger signal

Thanks

Hi,

How many winds are in your coil, 21ohms on the trigger is a lot. The impedance matching is in regards to the coil vs the battery. To be honest I don't much about that, but I simply aim for the lowest impedance I can in my windings. ie, my multimeter beeps when I test each strand.

Cheers,

Steve

[Druide]

I use higher wattage pots in my circuits. 5 Watts is the strongest I have at the moment. I find that I need them when building and tuning multi-coil circuits. The 0.5 watt pots are pretty much useless when you start to add more coils.

The other thing is that the bedini circuit is not designed for torque. Unless (in my opinion) some serious mods are made to the design you will not run a car alternator with it. They are hard enough to turn with your hand (when pluged in) let alone with an SG.

Cheers,

Steve

I've fried a few pots in my experimentations so, for the 4 coils 8 transistors SSG energizer I'm building, I think I'll replace the pot with rotary switches with fixed 2 or 5 watts resistors that can be added in series by turning the switches. Didn't figured out yet how to do that but it must be quite simple. Just an idea.



Michel

[dambit]

I've fried a few pots in my experimentations so, for the 4 coils 8 transistors SSG energizer I'm building, I think I'll replace the pot with rotary switches with fixed 2 or 5 watts resistors that can be added in series by turning the switches. Didn't figured out yet how to do that but it must be quite simple. Just an idea.



Michel

Hi Michel,

When building my device, I only used the pot for tuning and then replaced it with fixed resistors. The rotary switch is a good idea for having multiple tuning options.

Cheers,

Steve.

[Guruji]

Pots

Hi Dambit and Druide thanks for response.My car alternator is a rewinded one.I had rewind this alternator for a wind turbine in the past so it does not need alot of spinning speed.
About the pot yes it seems that I should use a higher wattage one.
How can one recognize the pot wattage?
Thanks guys.

[dambit]

Hi Dambit and Druide thanks for response.My car alternator is a rewinded one.I had rewind this alternator for a wind turbine in the past so it does not need alot of spinning speed.
About the pot yes it seems that I should use a higher wattage one.
How can one recognize the pot wattage?
Thanks guys.

Hi,

Most of the time the wattage of the pot will be written on it, but some times they aren't. In that case I just go for the one that is the biggest (physical size not ohms), usualy bigger is hartier. (but not always )

Cheers,

Steve

[kick-bak]

Hi,

How many winds are in your coil, 21ohms on the trigger is a lot. The impedance matching is in regards to the coil vs the battery. To be honest I don't much about that, but I simply aim for the lowest impedance I can in my windings. ie, my multimeter beeps when I test each strand.

Cheers,

Steve

Not sure how many turns, I lost count but over 600. The trigger is 0.4mm and the power is 0.6mm. I wound both at the same time. I'm going to unwind this coil and measure how long the strands are and will probably cut the trigger strand in half. I have now learned that thicker wire = lower ohms

My coils are quite heavy so haven't bothered to tie them down. I've noticed that i can turn the coils at an angle to the stator and I get more rpm's. I don't have a scope so can't really tell if the SG is putting out more power or less. So far I've managed to rejuvenate a 12v drill battery that would not hold a charge even when put on its own charger for a full day. Now it goes for hours and with plenty of torque

[tjnlsn255]

I am using a 25 watt 1k pot from Mouser Electronics...

The part number is RHS1K0E take a look at Mouser Electronics - Electronic Component Distributor....

If the wattage is not in the description it is in the data sheet....

Just a thought....

Todd

[dambit]

bus bars??

Hi All,

Does anyone have any advice on which material would be best for a buss bar. I am planning on using electrical brass flat bar, but if anyone has something to add I would be gratefull.

Cheers,

Steve

[theremart]

RE: Buss Bar

Hi All,

Does anyone have any advice on which material would be best for a buss bar. I am planning on using electrical brass flat bar, but if anyone has something to add I would be gratefull.

Cheers,

Steve

Erin's work shop often used these in his SSG.

Erwin's Work Shop

might look there

[dambit]

Also, has anyone noticed, or do they know why, the positive terminal on the charging battery turns almost black after a while. I have just started to see this in a couple of my larger batteries. I am also getting a powdery buildup on the negative post. Grey in colour.

Cheers,

Steve.

P.S. Thanks mart, that is a good site with lots of info.

[dambit]

rectified AC input

Hi All,

I have a 24V AC wall adapter and would like to know if it is possable to convert the signal to DC. I have tested with a bridge rectifier (4 diodes etc) but the charger acts like there is no return from the charging battery. Is there a way around this? Without buying a 24V DC power pack.

Cheers,

Steve.