Joule Ringer!

[Montec]

Hello all
I am not sure this is the best place to post this information but here goes.
If you are looking for a schematic on a fly back transformer, try using the information on the transformer and this site http://www.icxinyi.com/zlk.php?id=1876002 to find the HR number.  Then go this pdf http://tvservice.org/files/HR_trafos.pdf to find the schematic of the transformer in question. You can also do a search on the HR number.

[conradelektro]

@Montec

Thank you for the links to fly back transformer information, this is always useful.

Unfortunately I could not find the ones I got (KÖNIG might be spelled as KOENIG):

KÖNIG MAT33402
ELDOR 1182.0587
ELDOR 1072.0453
KÖNIG MAT33052
KÖNIG MAT33047
KÖNIG MAT33013
KÖNIG MAT33417 
+ three transformers without any readable ID

I could figure out the pins of the simplest one (no ID at all) and the pins of a second one are mostly identified (also has no ID). I started with the most odd ones, because I removed the core (which might not be a good idea in the end).

This site has a lot of info (but also nothing about my fly backs)  http://www.donberg.ie

And this is useful  http://lifters.online.fr/lifters/labhvps/tht.htm

I also would like to know how the HV-cable is normally connected to the secondary of a fly back transformer. I looked carefully at a transformer that has the cable missing, and I did not find any metal part where the HV-cable could have been connected to. The "hole" where the HV-cable was is obvious, but there is no clue as to how it got a connection to the secondary. I do not want to rip off the HV-cable from one of other transformers, because I might not be able to reconnect it.

Are there people in this forum who used a fly back transformer that had the HV cable missing?

Greetings, Conrad

[nievesoliveras]

Neves Oliveras

Jesus, tu entiendes el circuito de lasersaber?
Es decir, la parte del transformador alto voltaje y la parte del secundario y su bobina bifilar.

Espero que entiendas español ^^

un saludo

Saludos @munetaka!

Entiendo español.  Acerca del circuito de @lasersaber, para mi todavia es un misterio la configuracion del transformador.
El problema estriba en que el no explica claro los detalles.

Jesus

[gadgetmall]

@lasersaber:

Thank you for your reply, I appreciate that. For me the message of your videos was "replicate that, so that we learn more". Well, my question therefore was "What do you you want me to replicate".

To go on after that misunderstanding, I post your circuit as I understand it. My main issue with your circuit is the coil at pins 2 and 4 (which I labeled coil H in the drawing):

- If it is left out, we are back at Slayer's circuit, which I tried with self-wound coils and I got good results (still 10 to 20 mA power draw at 12 Volt or even 24 Volt). See at the beginning of page 8 in this thread and on page 7.

- If it is there, I would call it a "trigger coil", which triggers the switching on (rather than off) of the transistor.

This "trigger coil" gave me much trouble with my little fly back transformer. May be it is there where the Fuji-Camera-Transformer comes in. I now got some 10 fly back transformers (all different, for obsolete PC-monitors). And before I go into them I want to learn more about this "trigger coil", because it is crucial according to my tests. At least it is a reason for me to go into self wound coils or transformers, in oder to shape this trigger pulse just right (by adjusting the number of turns of this coil).

Since your circuit seems to perform interestingly well as far as power consumption is concerned, I hoped to get some solid hints from you about this trigger coil?

Drive coil and secondary coil will work within a wide margin (the only real drawback in case of error will be less Voltage), but the trigger coil is the determining factor for success.

Bifilar coil: I could not see a benefit in the bifilar coil over a capacitor (connecting the base of the transistor to +Vcc), but I keep my mind open. Bifilar coil or capacitor, it is there where the "slowing down" of the frequency happens. The trigger pulses are short and should rapidly follow each other (going to over a Megahertz, like in the Slayer circuit), but they come far apart because the base of the transistor somehow does not recover quickly. To me it looks like the base goes below the emitter and the transistor takes its time to recover from that normally unwanted situation, because the base finds high resistance everywhere to offload a negative charge.

The high resistor (1N60 diodes or Mega-ohms) between base of the transistor and +Vcc (via the bifilar coil or a capacitor) does not pull the transistor up (into the ON-state) because the current is too little. It is the current from the trigger coil or the secondary which does it. And it seems to be the negative part (of the sin-curve) that causes the delay (because of the situation "base below emitter"). Remember, in an ordinary Joule Thief, the base is pulled down by the trigger coil (the transistor is shut OFF).

In general: May be I always misunderstand the purpose of this forum (in my unbounded naivety). Isn't it to share? Or I am completely wrong? And I get disappointed when people make it so difficult to follow what they are doing. If you show something to people, don't you want them to understand as well as possible what you are offering them? Or is the purpose something else than offering information? Well, I am too dumb to get it, excuse me for my thickness.

Greetings, Conrad

Conrad this is his schematic . If failure persist for you then you should use his first EXACT parts . All other modifications would come after you completed his original design rather than forming some kind of exciter using forign materials and not getting Lasersabers results . Pin 1 is not connected to anything and is a dummy pin on the AA fuji transformer.
Gadget

[resonanceman]

I also would like to know how the HV-cable is normally connected to the secondary of a fly back transformer. I looked carefully at a transformer that has the cable missing, and I did not find any metal part where the HV-cable could have been connected to. The "hole" where the HV-cable was is obvious, but there is no clue as to how it got a connection to the secondary. I do not want to rip off the HV-cable from one of other transformers, because I might not be able to reconnect it.

Are there people in this forum who used a fly back transformer that had the HV cable missing?

Greetings, Conrad

Conrad

I have never seen a flyback transformer that used a connector  of any kind on the secondary......... I am sure your flyback with the missing coil is damaged.

gary