Incidentally , how do you think they get that led to flicker???

I don't know do you? There must be a programmeded microcontroller inside the housing of the LED? Not much room for hard wired componentry like ICs and resistors and capacitors and diodes.

 

It appears from the photo that a current limiting resistor is included in LED package if operating on 4.5
V, but with 9 V add about 20 ohms, & at 12 V about 68 ohms.
Post # 12, operate on 4.5 V, remove R1, bypass R3.
How much current do you wish for LED; 200 mA is pretty bright.

Thanks for your encouragement and advice bernard. I will check this out after a few days. I am tied up with work presently.

 

I 100% agree. With the LED following the 2222, you get current through the BE junction. Even if you have no power applied to the collector, the BE junction can still light the LED. I discovered this the first time I built a chase light circuit using 2222's and a decade counter. Having zero volts on the collector, my LED's were still lighting. Not as brightly as when I powered the collector, but they were still lighting. In my circuit I was strobing the collector. With the speed of the chase and the strobe I could make it appear as though the chase lights would move left to right or right to left. At certain frequency combinations I could make chase lights appear to be moving in both directions at the same time. I don't have that diagram any longer. That was back in the 80's.

But I agree, the transistor should follow the LED. That way you have full control of the LED's brightness.

Thanks for the advice tonyr. I will keep working on it and let you know how I go. Work has to take precedence over next few days

 

Hello,

Here is an other example for a power led from a candle led:
http://www.discovercircuits.com/H-Corner/HC-Flameless LED Candle Power Boost.htm

Bertus

 

Hello,

Here is an other example for a power led from a candle led:
http://www.discovercircuits.com/H-Corner/HC-Flameless LED Candle Power Boost.htm

Bertus

Oh wow Bertus that looks perfect. It's low power yes? I'll make it in a few days and let you know. Thanks so much.

 

Hello,

When you feed the led with the power supply needed, the fet will drive it.

Bertus

 

Hello,

Here is an other flame simulator circuit from a dutch forum:
http://www.schakelingenonline.nl/schakelingen/lichteffecten/9.htm
Here is the google translation:
https://translate.google.nl/transla...genonline.nl/schakelingen/lichteffecten/9.htm

Bertus

 

They have a little chip which produces PWM, apparently it has a linear feedback shiftregister that most likely creates a puedorandom bitstream and some shaping to emulate a candle... it's not bad

 

Hello,

Here is the full article:
https://cpldcpu.wordpress.com/2013/12/08/hacking-a-candleflicker-led/
And another:
https://www.evilmadscientist.com/2011/does-this-led-sound-funny-to-you/

There are also large flaming led lamps:
https://electricaltechnology.store/products/led-flame-lamp

Bertus

 

If you want more... there are a few different chips but here is one decapsulated...

http://siliconpr0n.org/archive/doku.php?id=azonenberg:unknown:candleflicker_led

 

(about the circuit in #12) you likely don't want to increase the supply voltage as it makes the thing less efficient