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4hv.org :: Forums :: General Science and Electronics
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Source for small ferrite transformers
Move Thread LAN_403
kimbomba
Sat May 28 2016, 04:47AM Print
kimbomba Registered Member #3854 Joined: Fri Apr 29 2011, 03:45AM
Location: Mexico
Posts: 95
 		I was asked to advise on the design of a small HV power supply like the ones used in insect killers. The typical design uses an oscillator that drives the small transformer and perhaps a multiplier at its output. Does anyone know where can I buy such transformers? thanks in advance
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rikkitikkitavi
Sat May 28 2016, 05:36AM
rikkitikkitavi Registered Member #57278 Joined: Wed Sept 16 2015, 11:33AM
Location:
Posts: 8
 		All electronic suppliers should have them, digikey etc.

Unless you can get hold of used PC power supplies, there are several in these that can be reused. Desolder, put in water, heat until boiling (slowly) and let simmer for about 10 min.
Voila the resin binding the transformer halves is soft and you can pull it apart.

Sometimes it needs oven baking at about 120-130C.
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Proud Mary
Sat May 28 2016, 04:30PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
 		I have bought several DIY 20kV hobbyist kits that include a step-up transformer from China, and will be buying some more, as will no doubt other folk from here when they see what fun is to be had for a few pennies from ebay.

Link2

The HV kit costs £2 = €2.60 = US$ 2.90 including post and packing and comprises a step-up transformer, a power transistor plus heat-sink, a diode, a resistor, and a piece of twin flex 6cm long. It is designed to be powered from a single lithium-ion cell type 18650 but is good to go across the range 3.7 V - 7.2 V @ ~1.5 A.

The instructions are written in what I think must be Chinese, but there is a very clear circuit diagram and a very clear photograph of the parts connected up, so even the total beginner will have no problem at all making this into a working project.

I powered my first kit with a little 6 V 1.3 AH lead-acid accumulator (so as not to risk spike damage to my bench PSU) and it worked right away but before switching on I made one small modification to the original design. I strapped a 200 MΩ 1% vitreous HV resistor across the output to act as a load that would draw 100 μA when 20 kV was placed across it. I was concerned that the unloaded output voltage might rise to unsteady and self-destructive heights. I measured Vout across the 200 MΩ resistor with an electrostatic voltmeter, and found 16 kV when the lead-acid accumulator was supplying 7.2V to the circuit. To investigate further, I doubled the size of the load resistor to 400 MΩ 1%, which had the effect of increasing Vout to 18 kV - as I suspected it might.

So there it is, a high ratio step-up transformer and parts to make an HV low-current supply for £2 = €2.60 = US$ 2.90 with free post and packing. The kit, as loose parts, was contained in a small padded envelope and took eleven days to make its way from China to England.

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Conundrum
Sun Jul 17 2016, 05:23PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
 		ie Link2

I have here a high voltage transformer which seems to be vacuum encapsulated. Any way to solder a broken primary wire back on?
Its very similar to the ones used in gas ignitors.
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Patrick
Sun Jul 17 2016, 05:54PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		TSC International is my preferred supplier.
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