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Author Topic: Oscillator Powering 6 Modified Led bulbs  (Read 12116 times)

Offline casiano

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #105 on: June 11, 2017, 06:14:04 PM »
Hi Skywatcher.thanks for your words.
Yes,i use a choke coil,the bigger the better it seems.Im planning to get a bigger one.
For now i have only 5 led bulbs rated at 36v ,the other ones are different voltage,so i cannot use them.



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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #105 on: June 11, 2017, 06:14:04 PM »

Offline casiano

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #106 on: June 11, 2017, 06:27:01 PM »
The next step is to put 20 or 30 led bulbs to this circuit.
My nearby electronic store has this led bulb at 1.69 euro.


Offline SkyWatcher123

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #107 on: June 12, 2017, 04:24:40 AM »
Hi casiano, thanks for sharing the information.
Keep in mind, those 12 watt led bulbs will require more input power to get them to high intensity levels, especially if they are all modified and placed in parallel.
That is one of the reasons i chose the 5.5 watt versions or 40 watt incandescent equivalent, so i could get them to a good intensity for lower input.
I installed the other 2 bulbs, now have a total of 12 modified led bulbs in parallel.
The practical illumination is even better and the more efficient boost converter also helps.
Next step, get 4 more led bulbs to modify and add to the parallel string.
peace love light
Here is pic of 12 bulbs, using 7.8 watts.

Offline casiano

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #108 on: June 12, 2017, 07:53:31 AM »
Yes you are right Skywatcher,the modified 12w led bulb needs 65v to light,instead the 7w bulb needs only 36v.So, the lower the better.I will try the 3w bulb to see what happens.


Offline magnetman12003

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #109 on: June 12, 2017, 08:28:27 AM »
Can someone tell me how to determine F stop values using a candle power meter?  I have a lux/candle power meter and there must be a way to determine F stops using some sort of equation or equations.  Say I measured  100 candlepower and my next reading was 500 candle power. What f stop value can be found between readings?? 1/3 ?? 1/2??  3/4??  1??  F stop

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #109 on: June 12, 2017, 08:28:27 AM »
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Offline magnetman12003

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #110 on: June 13, 2017, 02:39:56 AM »
Hi all, was posting about this particular oscillator light in another thread, felt it was good enough for its own thread.
It's the basic joule thief style circuit, using gutted 12 volt led bulbs rated at 7 watts from ebay.
The bulbs did contain a boost circuit inside them, to boost from 12 volts to around 21-24 volts dc, of course i removed that circuit from each bulb, for added efficiency.
The setup really is putting out a very good amount of light.
I was previously using a small number of turns on the ferrite c-core, then used many more coil layers and increased efficiency even further.
When looking at a Phillips 40 watt equivalent led bulb in a nearby can light, it is not much brighter than one of the 6000k pure white led bulbs.

Question:  How bright is your neon bulb when you are powering the bulbs you used in your 12 volt circuit?
I just finished replicating your 12 volt circuit with some modifications.  Have not tested it yet but my neon bulb lights up with the circuit not connected to any bulbs.  Just powered by a 12 volt battery.  More to come....
Here is a drawing and some pics.
peace love light

Offline SkyWatcher123

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #111 on: June 13, 2017, 03:43:36 AM »
Hi magnetman, without a load off the flyback diode, the neon will probably always light up.
If i recall correctly, a single neon did not light up with the 12 volt 7 watt modified led bulbs as load.
peace love light

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #111 on: June 13, 2017, 03:43:36 AM »
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Offline magnetman12003

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #112 on: June 13, 2017, 06:13:08 AM »
Hi magnetman, without a load off the flyback diode, the neon will probably always light up.
If i recall correctly, a single neon did not light up with the 12 volt 7 watt modified led bulbs as load.
peace love light
I just competed testing my replication of your 12 volt setup. I used a single unmodified 12 volt five watt led bulb to see what happens. Connected directly to a 12 volt battery the bulb burns with a 379 candlepower rating.  When I place my replication of your 12 volt setup between the battery and bulb the neon light goes out and at first the bulb burned with a 1300 candle power rating and that lasted for 3 minutes. Until the insides of the bulb electronic package failed and it quit burning.  Now I am wandering if 9 seven watt led bulbs might go out the same way.

Offline SkyWatcher123

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #113 on: June 13, 2017, 07:53:39 PM »
Hi magnetman, sorry that your bulb fried and i know the reason why.
I tested mine as modified bulbs, meaning, if you leave the inner circuitry, that circuit will see far more than the 12 volts the bulb is rated for.
Because my circuit is a boost converter and the buffer capacitor is going to be above 12 volts and thus pushing too much current through the bulbs inner circuitry. :o
My 12 volt led bulbs, modified led circuit board forward voltage is around 20-24 volts, which then makes it safe for that circuit.
It would be ok, to power your 12 volt bulbs, non-modified, using my circuit, if you ran the diode to positive of capacitor and then the negative of capacitor, to the positive of your power supply, then place your led bulb in parallel with capacitor, though not sure how efficient that might be.
In that configuration, we avoid the direct 12 volts coming from your power supply and the current flow potential that creates.
peace love light

Offline magnetman12003

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #114 on: June 13, 2017, 08:18:27 PM »
Hi magnetman, sorry that your bulb fried and i know the reason why.
I tested mine as modified bulbs, meaning, if you leave the inner circuitry, that circuit will see far more than the 12 volts the bulb is rated for.
Because my circuit is a boost converter and the buffer capacitor is going to be above 12 volts and thus pushing too much current through the bulbs inner circuitry. :o
My 12 volt led bulbs, modified led circuit board forward voltage is around 20-24 volts, which then makes it safe for that circuit.
It would be ok, to power your 12 volt bulbs, non-modified, using my circuit, if you ran the diode to positive of capacitor and then the negative of capacitor, to the positive of your power supply, then place your led bulb in parallel with capacitor, though not sure how efficient that might be.
In that configuration, we avoid the direct 12 volts coming from your power supply and the current flow potential that creates.
peace love light


 I found that my modified replication output is 354.7 volts dc.  So using three 115 volt led bulbs in series and unmodified should work.  I am going to try it.   354.7  divided by 115 is 3.08   I know the bulbs are AC but the DC output is composed of spiked energy.  I just tried it with one 115 volt 10 watt led bulb and the bulb rapidly pulsed very-very  brightly and did not burn out.  It was unmodified.  Next I am going to power 3  ten watt 115 volt led bulbs in series with my very large 360 watt 12 volt power supply ( Not my 1.2 amp hour 12 volt battery ) and see if the pulsing stops. I think more current is needed to keep the setup capacitor fully loaded all the time so the bulbs won't pulse.
« Last Edit: June 14, 2017, 02:33:44 AM by magnetman12003 »

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #114 on: June 13, 2017, 08:18:27 PM »
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Offline SkyWatcher123

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #115 on: June 14, 2017, 04:45:57 AM »
Hi magnetman, nice looking setup you have there, thanks for sharing.
Using 3 non-modified led bulbs in series could be quite efficient, considering the radiant spikes like loads closer matched to their qualities.
As long as the driver circuitry within those bulbs, is getting a high enough voltage and current, the pulsing should stop.
Look forward to your results.
peace love light

Offline magnetman12003

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #116 on: June 14, 2017, 06:21:01 PM »
Hi magnetman, nice looking setup you have there, thanks for sharing.
Using 3 non-modified led bulbs in series could be quite efficient, considering the radiant spikes like loads closer matched to their qualities.
As long as the driver circuitry within those bulbs, is getting a high enough voltage and current, the pulsing should stop.
Look forward to your results.
peace love light


If any one is interested in my modified replication specs let me know and I will post what changes were made.  By far the coil winding is most simple to do as far as changes to the first 12 volt  original post by Sky Watcher 123.


Offline SkyWatcher123

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #117 on: June 19, 2017, 09:36:46 PM »
Hi all, so i was wondering if i could equal or exceed the efficiency of the 600 watt boost converter that was bought from the net.
I have equaled or improved the efficiency by a little so far.
I used the joule thief circuit, with the NPN 2SC5359 transistor, 1 Kohm base resistor and same buffer capacitor.
Also used the same ferrite tube core, though this time i used a bifilar 18awg. magnet wire on the open core.
The circuit uses 1.5 amps at 11.56 volts or 17.34 watts.
I wonder if another layer of 18awg. wire could improve efficiency or even a thicker gauge wire, with even more layers.
I will try another layer of 18awg. magnet wire and see, will try in series and parallel and compare.
peace love light
 

Offline SkyWatcher123

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #118 on: June 21, 2017, 06:41:25 AM »
Hi all, started testing a different configuration and the results so far, are promising.
Measured the volts and amps going in and volts and amps going out into the charge battery and that comes to 81.3% efficiency.
The thing is, we are getting the good light and the charging, so 81% may be lower than it actually is.
Thoughts welcome.
peace love light


Offline magnetman12003

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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #119 on: June 22, 2017, 03:41:46 PM »
Hi all, started testing a different configuration and the results so far, are promising.
Measured the volts and amps going in and volts and amps going out into the charge battery and that comes to 81.3% efficiency.
The thing is, we are getting the good light and the charging, so 81% may be lower than it actually is.
Thoughts welcome.
peace love light

What was the amp hour rating of the batteries you used?   I have a lot of 1.2 amp hour 12 volt batteries. Might they work? I see you can buy this same 600 watt boost converter on Ebay for an inexpensive price.


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Re: Oscillator Powering 6 Modified Led bulbs
« Reply #119 on: June 22, 2017, 03:41:46 PM »

 

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