Lasersaber strikes again. A joule thief king ?

[Groundloop]

If the goal is to get really low voltage operation then a JFET or depletion mode MOSFET will do.  For operation in the 1V range there are lots of logic level gate threshold enhancement MOSFETs and lots of BJTs that will do.

Hi Mark,

Yes, and my little 2SD669A is doing quite well in my circuit. I can run the circuit at voltages down to approx. 0,9 Volt
without any problems. But I need approx. 2,8 Volt input to get full light in the LED bulb. I do not need full LED
brightness when used as a "night light", so two very depleted AA batteries is OK in this circuit. My two series AA
batteries is now down to 1,021 Volt and there is enough light in my LED bulb (12 Volt 0,5 Watt type) to see in
the dark. And, the circuit uses so little current that my drained batteries only drop approx. 0,010 Volt each night.

I'm now working on a recharge system. I'm using 10 IR LEDs is series and 10 of them in parallel to get a small IR
solar charger. My panel will charge one 1,2 Volt 700mA NiCad battery from the SUN during the day, and that charge
is used during the night to get my "night light". Everybody knows that a Infra Red (IR) solar panel don't work, right? :-)

GL.

[ramset]

here is another ongoing effort from Slyder


https://www.youtube.com/watch?v=nIcvbRzhdzo


thx
Chet

[forest]

If the goal is to get really low voltage operation then a JFET or depletion mode MOSFET will do.  For operation in the 1V range there are lots of logic level gate threshold enhancement MOSFETs and lots of BJTs that will do.

No, I was commenting on the video link. The best way to prevent reverse polarity connection at the input stage of circuit is to use low Rds N-Mosfet. That way it will shut-off in case of wrong connection and pass current in good connection without much voltage drop.Something like mOhm range mosfet with Vds above 25V is good.

[Marsing]

Hi Mark,

Yes, and my little 2SD669A is doing quite well in my circuit. I can run the circuit at voltages down to approx. 0,9 Volt
without any problems. But I need approx. 2,8 Volt input to get full light in the LED bulb. I do not need full LED
brightness when used as a "night light", so two very depleted AA batteries is OK in this circuit. My two series AA
batteries is now down to 1,021 Volt and there is enough light in my LED bulb (12 Volt 0,5 Watt type) to see in
the dark. And, the circuit uses so little current that my drained batteries only drop approx. 0,010 Volt each night.

I'm now working on a recharge system. I'm using 10 IR LEDs is series and 10 of them in parallel to get a small IR
solar charger. My panel will charge one 1,2 Volt 700mA NiCad battery from the SUN during the day, and that charge
is used during the night to get my "night light". Everybody knows that a Infra Red (IR) solar panel don't work, right? :-)

GL.

You are absolutely right, Infra Red (IR) solar panel don't work,
and it  will not work also when you try something weird, right ?

Welcome to the  forgotten technology..

[SkyWatcher123]

Hi folks, Hi groundloop, thanks for sharing.
Could you share what kind of current and voltage output you're getting with your infrared led panel in the sun and indoor light, when charging your AA cell, thanks.
Also, what do those infrared leds cost.
peace love light