3.7 VOLT BATTERY POWERS 56 WATTS

[citfta]

Hi Gyula,

I am afraid I have to disagree with your correction.  His schematic seems to be correct to me.  If you consider the output circuit to be separate from the input makes it easier to see what is happening with the SCR.  The input and output are sharing the same negative rail but they don't have to for the circuit to work.  In your mind break the negative rail just to the right of the connection of the neon that goes to diode D2.  Now look at the SCR circuit.  You can now see that the SCR has to have the cathode connected to the negative side of  C1 or it could not turn on.  Also as you have corrected it there is no way for a positive signal to get to the gate to turn on the SCR.

Respectfully,
Carroll

[SkyWatcher123]

Hi all, thanks for the clarification magnetman.
I will be picking up an SCR soon to build this device and couple other parts.
One more thing magnetman, is the neon lighting up fairly constantly, if you can even see it light up that is.
I guess it is, or you would probably see the led bulbs increase and decrease in brightness.
Are the led bulbs lighted in a stable way or can you detect any fluctuations.
Anyway, i will be building this.
peace love light

[magnetman12003]

Hi all, thanks for the clarification magnetman.
I will be picking up an SCR soon to build this device and couple other parts.
One more thing magnetman, is the neon lighting up fairly constantly, if you can even see it light up that is.
I guess it is, or you would probably see the led bulbs increase and decrease in brightness.
Are the led bulbs lighted in a stable way or can you detect any fluctuations.
Anyway, i will be building this.
peace love light

The neon bulbs light up at different intervals depending on what you are experimenting with. But most of the time you cant see them lit.  As far as the 8 led bulbs go they seem to keep good brightness constant at least to my eyes when powered by 1.2 AH 12 volt battery or wall wart.  8 bulbs will light up dimmer when a power source with little current is used.  Say you powered it with a very small 27A - 12 volt battery or same with 5 volts out of a USB  battery charger. I have been experimenting with this circuit now for 3 years and it still keeps on working like the battery bunny on TV

Its the most interesting circuit I have ever put together that keeps you guessing what its capable of doing

[gyulasun]

Hi Gyula,

I am afraid I have to disagree with your correction.  His schematic seems to be correct to me. 
If you consider the output circuit to be separate from the input makes it easier to see what
is happening with the SCR.  The input and output are sharing the same negative rail but they
don't have to for the circuit to work.  In your mind break the negative rail just to the right of the
connection of the neon that goes to diode D2.  Now look at the SCR circuit.  You can now see
that the SCR has to have the cathode connected to the negative side of  C1 or it could not turn on. 
Also as you have corrected it there is no way for a positive signal to get to the gate to turn on the SCR.

Respectfully,
Carroll

Hi Carroll,

Yes, you are correct. Unfortunately, in my mind I mixed up the position of the thyristor switch as if
it would be in series with the load  while in magnetman's circuit it is in series with capacitor C1 which
is the voltage source for the load.

I deleted my incorrect drawing from my post.

Thank you.

Gyula

[citfta]

Hi Gyula,

You are welcome.  I made a similar mistake a couple of weeks ago.  I had a circuit all designed on paper.  It was only after I started putting parts together on a piece of perboard that I realized my circuit wouldn't work like I wanted it too.  So it was back to the drawing board again.    I guess most of us do that from time to time.

Take care,
Carroll