Stingo Solid State Battery Charger

[Guruji]

Stingo

Hi Sucahyo today I tried my last circuit again with the FWBR and measured 20ma. Maybe I did something wrong last time. Ok nice circuit.
I think both negative and postive charging should be used to revive batteries.
Thanks

[sucahyo]

Thanks kcarring, I wish you well too.

Thanks for the info Guruji. I test single diode version with alum water filled gel battery recently, and it seems to have less capacity since it deplete too quick with computer fan as load.

[Guruji]

Stingo

Hi Sucahyo that double circuit is with one capacitor on the FWBR. Is this better for charging?
What type are you using still 250v 1uf?
Thanks

[sucahyo]

Hi Sucahyo that double circuit is with one capacitor on the FWBR. Is this better for charging?
What type are you using still 250v 1uf?
Thanks

I use 200uF now but I don't think it would be different from 1uF 250V one.

The one that I post previously use two capacitor. I now use two capacitor for double circuit because the output is greater if the coil collapse path is not blocked by the capacitor. So now the capacitor only block the normal current.



Two circuit = double output power, three circuit = three times output power. Very usefull if you want to limit the current on each circuit. I prefer three with 200mA output each instead of one with 600mA output.

[Guruji]

Stingo

Regarding the latest version circuit is that negative charger? Can this circuit be done to switch from postive to negative charging just with a switch?
Sorry for many questions Sucahyo but I like this circuit
Thanks

[sucahyo]

Regarding the latest version circuit is that negative charger? Can this circuit be done to switch from postive to negative charging just with a switch?
Sorry for many questions Sucahyo but I like this circuit
Thanks

Sorry, I don't think I can classify it that way. Can you mention the difference of negative and positive charger?

What do you think of this circuit bellow? I don't use this though.




I get good result from normal FWBR version for gel, nicad, nimh and even zinc carbon. I think the difference between using FWBR vs single diode is more important than positive vs negative charge.

[skaght]

charging nicad 14.4 volt battery

@Sucahyo

I'm trying to restore some old 14.4v nicad batteries for my cordless drill. I've got a stingo up and running, but the nicad voltage (starting charge 12 volts) shoots past 15 volts within seconds of being hooked up. I tried decreasing the capacitance to limit current some by using .1 uF cap, but the voltage still charged past 15 volts really quickly. Any thoughts on how I can adjust this thing to the appropriate charge rate??? The circuit isn't really drawing that much power, so I'm surprised that the battery voltage is climbing so quickly. Do you know what voltage I should aim for with nicads for full charge with a stingo?

[sucahyo]

@Sucahyo

I'm trying to restore some old 14.4v nicad batteries for my cordless drill. I've got a stingo up and running, but the nicad voltage (starting charge 12 volts) shoots past 15 volts within seconds of being hooked up. I tried decreasing the capacitance to limit current some by using .1 uF cap, but the voltage still charged past 15 volts really quickly. Any thoughts on how I can adjust this thing to the appropriate charge rate??? The circuit isn't really drawing that much power, so I'm surprised that the battery voltage is climbing so quickly. Do you know what voltage I should aim for with nicads for full charge with a stingo?

I think your nicad has become low in capacity, or you use too much power.

How many is your circuit current consumption? Capacitor would not reduce output power. You need to increase the potentiometer connected to PNP (TIP32C) base.

For reference, two nicad that measured to has standing voltage of 2.7V usually reach 3.5V when charging. I sometimes let it reach 4V.

I think reaching 15V is ok. It indicate either:
- your circuit has low output power but you battery has low capacity
- your battery is good and your circuit has high output power.


Measure the output with amp meter in series with the nicad. Make sure it is around battery capacity divided by 20.

When the battery get hotter than 40 degree or hotter than high fever, stop charging.

[Guruji]

Pos and Neg charge

Sorry, I don't think I can classify it that way. Can you mention the difference of negative and positive charger?

What do you think of this circuit bellow? I don't use this though.




I get good result from normal FWBR version for gel, nicad, nimh and even zinc carbon. I think the difference between using FWBR vs single diode is more important than positive vs negative charge.

Regarding positive and negative charging what I read is that postive charging is with caps while negative is direct with diodes. I assume that freq wave is the different too.
That circuit is interesting should try that.
Thanks for sharing.

[sucahyo]

Regarding positive and negative charging what I read is that postive charging is with caps while negative is direct with diodes. I assume that freq wave is the different too.
That circuit is interesting should try that.
Thanks for sharing.

Ok, thanks. In that way FWBR version of stingo charge the battery alternately with negative charge right after coil shutted off, and then briefly after that with postive charge. This only theory but I found the battery do behave differently from when I use single diode only.

I don't use that circuit because it is less efficient and FWBR stingo is good enough. Too many transistor to replace if I mess up too lol. I use it as motor driver now, with bellow configuration to make the motor spin twice faster and consume half of the previous:

[kcarring]

confused

I have seen so many different Stingo circuits, I am utterly confused.

I have gone through the thread and deduced that the one I wired was much more complicated, and so I have landed on this one:

ImageShack® - Online Photo and Video Hosting

Can some one explain how you connect a FWBR four pole componened ( ~ ~ + - ) to this circuit? Thanks.

Kyle

[7imix]

Remove the diode and the charge battery. Place a small dc blocking capacitor where the charge battery was hooked up and connect the other side of the capacitor to the bridge rectifier ~. Connect the other side of the rectifier ~ to where the diode was hooked up.

Across the top and bottom of the coil is where the high voltage backspike can be seen in a stingo circuit.

[sucahyo]

I have seen so many different Stingo circuits, I am utterly confused.

I have gone through the thread and deduced that the one I wired was much more complicated, and so I have landed on this one:

ImageShack® - Online Photo and Video Hosting

Can some one explain how you connect a FWBR four pole componened ( ~ ~ + - ) to this circuit? Thanks.

Kyle

You can connect like 7imix mentioned.

I don't use that kind of FWBR because:
- I scrap some FWBR component from broken PSU and it block worse than normal black diode. Previous experiment show worse efficiency too.
- with DC blocking capacitor, the output is about half then if we block only the one from source positive.

[kcarring]

clarifying

Sucahoya,

Are you, then, saying that, in the circuit:
ImageShack® - Online Photo and Video Hosting

that the single diode leading to positive of the charge battery, is all that you use? I may have misunderstood you. Many times you have mentioned "I recommend charging with a FWBR". Yet I have never seen one in any of your circuits.

Also, is the above circuit your more recent, and used... or ?


Thanks.
Kyle

[sucahyo]

Sorry for the confusion. I use two method for recovery:
- single diode for max output but at the risk of battery turning into capacitor
- FWBR version for better battery charge

The above recovery method apply to any other circuit too, not just stingo. So I usually refer new stingo modification only on the main part, not the recovery. Sorry.


Here is the circuit: