Negative ions generator - Page 1
Forum section: electronics / projects

author: atferrari
author_rank: Frequent Contributor
timestamp: October 15, 2014, 03:34:06 pm
content: Negative ions generatorAsuming the circuit is correct, I cannot grasp how it works.Could anyone explain it?Thanks for any help.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 15, 2014, 03:50:49 pm
content: 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

author: atferrari
author_rank: Frequent Contributor
timestamp: October 15, 2014, 05:11:29 pm
content: Quote from: T3sl4co1l on October 15, 2014, 03:50:49 pmI 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.

author: Andy Watson
author_rank: Super Contributor
timestamp: October 15, 2014, 05:20:34 pm
content: 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.

author: atferrari
author_rank: Frequent Contributor
timestamp: October 15, 2014, 07:55:20 pm
content: Quote from: Andy Watson on October 15, 2014, 05:20:34 pmAha. Now I understand. Gracias for that.

author: IanB
author_rank: Super Contributor
timestamp: October 15, 2014, 08:06:41 pm
content: 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.

author: Alex_arg
author_rank: Contributor
timestamp: October 19, 2014, 09:44:31 pm
content: 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, butHigh 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. (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 toput a 1Meg resistor in series with the needle(s).Alejandro.

author: atferrari
author_rank: Frequent Contributor
timestamp: October 19, 2014, 09:53:07 pm
content: Quote from: Alex_arg on October 19, 2014, 09:44:31 pmNot yet. Maybe in the next weeks I will find time. Espero...

author: Alex_arg
author_rank: Contributor
timestamp: October 19, 2014, 10:11:21 pm
content: Jaa Argentino ?? Si queres te envio el circuito x mail. Saludos