In the attachments there are two circuits (circuit 01 & circuit 02) which I intent to charge a photo-flash capacitor for zapping Nicad batteries.
I’m confused about the transformer connection to other parts.
In circuit 01 all three coils are winded in the same direction (using right hand technique).
-L1 starts from pin 3 – ends at pin 2
- L2 starts from pin 4 – ends at pin 1
- L3 starts from pin 6 – ends at pin 5
View attachment 100839
In the diagram I labeled transformer points as A B C D & E
I need help to connect the transformer (ie.
Which pin to connect to which point, like pin 2 = point C ….).
In circuit 02 there are 2 coils.
-L1 starts from pin 2 – ends at pin 1
- L2 starts from pin 4 – ends at pin 3
I connected the pins like the diagram.
View attachment 100840
Not yet tested the circuit to be sure that the
transformer coil orientation is correct!
I got both the circuits from internet and added the feedback / control system myself.
Is the feedback system correct?
Hy polshad,
Where are you from: care to put it in your user page beside 'Location' so that it shows in the window on the left of your posts.
About your circuit 02:
This is a widely used relaxation oscillator which is very tolerant of component values.
I assume that 1000μ and 30μ refer to the number of turns on the transformer.
The connections that you have shown for the transformer are correct, providing pin 2 and pin 4 are the same phase. It does not matter if they are both starts or finishes. But the ratio of the collector turns to the feedback turns should be around 1:3, not 30:1000 (1:33), which means that the inverter will probably not start with a 1.5V battery.
The inverter that you show, if it started, would probably produce about 15V across the capacitor, but it is impossible to be definitive because the characteristics of the transformer are not given. Can you say what voltage you require across the capacitor?
Normally, for a high voltage output, a separate winding of about 15 turns to 30 turns would be required for the collector of the driver transistor and the rectified output would be taken from the 1,000 turn winding.
The feedback circuit you have designed in quite clever, but the ratio of the feed back resistors, R2, R3, in not correct; it is way too high and would stabilize at 257 volts. R5 serves no purpose and can be removed.
Suggest make R2, 5.6K then the output voltage can be calculated by, 0.6V + (100uA * R3). For example if you wanted an output voltage of 10.6V, R2 would need to be 100K.
By the way, the feedback circuit would not be very accurate, but probably good enough for your job.
In addition the feedback circuit may simply stop the oscillator from working once the target voltage on the capacitor has been reached. Some form of hysteresis may be required to jolt the oscillator back to life. But maybe you would want the oscillator to stop once the target voltage has been reached.
One final point: I do not think that a 470uF capacitor would be able to provide sufficient current to reliably blast away the crystals from a dead NiCad cell: 10,000 uF capacitor charged up to 12V, 24V, and 36V (selectable) would be nearer the mark. But, of course, the amount of current required to blast the crystals depends on the size of the NiCad cell. And the voltage required would depend on the degree of cystalization.
In my days of recovering old NiCad batteries, I used to flash them across 12V automobile batteries in series, but I would not recommend that you do this because, if you are not careful, the NiCad battery can explode.
spec
**broken link removed**