EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: atferrari on October 15, 2014, 03:34:06 pm
-
Negative ions generator
Asuming the circuit is correct, I cannot grasp how it works.
Could anyone explain it?
Thanks for any help.
-
What about it?
What's circled, did you mean to comment on that?
Frequency is awfully slow, but maybe it's an iron core power transformer. 36 diodes seems optimistic (36kV from a power transformer, yeah sure), but it should do something.
Looks like Gernsback, maybe Electronics Now / Poptronics, back when that was a thing. Don't know what issue.
Tim
-
What about it?
What's circled, did you mean to comment on that?
Frequency is awfully slow, but maybe it's an iron core power transformer. 36 diodes seems optimistic (36kV from a power transformer, yeah sure), but it should do something.
Looks like Gernsback, maybe Electronics Now / Poptronics, back when that was a thing. Don't know what issue.
Tim
I expected the circled terminal of the secondary to be returned to ground. But not sure how it works as it is, I asked for an explanation.
-
The text says "automobile ignition coil". The low voltage winding will be energised for a period determined by the 555. When it turns off, the energy in the coil/transformer will generate a high-voltage pulse on the output 10-15kV. In comparison, standing the transformer on the +12V, or 0V (ground) makes little difference. The reason for standing it on the 12V line is that standard ignition coils are made that way - i.e. only three terminals - one of which is common to both the low and high voltage windings.
-
The reason for standing it on the 12V line is that standard ignition coils are made that way - i.e. only three terminals - one of which is common to both the low and high voltage windings.
Aha. Now I understand. Gracias for that. :-+
-
There normally would be a high value current limiting resistor between the high voltage generator and the output needle. Otherwise if you touch the output you are going to get a nasty belt.
-
Hi ! did you build it ??
I built one Negative Ion generator a few years ago, (oscillator, ferrite transformer and a Cockcroft-walton voltage multiplier), it works, but
High Voltage diodes get too hot , then i replace the osc and trafo by a small 7"CCFL inverter and its working since then.
I can't measure how much cleaner the air is, but it's very effective killing the flux and tobacco smoke :-+ . ( :palm: forgive me Father i smoke)
I think using a car ignition coil for that purpose is at least exaggerated, and maybe dangerous, as other user says, it would be adviceable to
put a 1Meg resistor in series with the needle(s).
Alejandro.
-
Hi ! did you build it ??
I built one Negative Ion generator a few years ago, (oscillator, ferrite transformer and a Cockcroft-walton voltage multiplier), it works, but
High Voltage diodes get too hot , then i replace the osc and trafo by a small 7"CCFL inverter and its working since then.
I can't measure how much cleaner the air is, but it's very effective killing the flux and tobacco smoke :-+ . ( :palm: forgive me Father i smoke)
I think using a car ignition coil for that purpose is at least exaggerated, and maybe dangerous, as other user says, it would be adviceable to
put a 1Meg resistor in series with the needle(s).
Alejandro.
Not yet. Maybe in the next weeks I will find time. Espero... :P
-
Jaa Argentino ?? Si queres te envio el circuito x mail. Saludos