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[Mk1]

@ jesus

I think a zener and 2 resistor could do.

Mark

[nievesoliveras]

@ jesus

I think a zener and 2 resistor could do.

Mark

Thanks!
I will take that into consideration on my new designs.

Jesus

[nievesoliveras]

@all

I will try @gadgetmall's and @mk1 ideas.
First I need to change the 1.5v running circuit.

With the Tip31A transistor and the Neon bulb in place, it looks like the first graphic.
With the toroid, flash transformer, or audio transformer eliminated, looks like the second graphic.

Now I have a clean canvas to experiment.

[Mk1]

I also just got that Adjustable output down to 1.2V , LM317.

http://www.national.com/mpf/LM/LM317.html

[nievesoliveras]

I also just got that Adjustable output down to 1.2V , LM317.

http://www.national.com/mpf/LM/LM317.html

Thank you @mk1.

Can you believe me if I tell you that I used that approach to lower an output 0f 30 volts to 13 volts on a self running motor I was trying to do with an alternator and it did not pass for my mind even for a minute?

The photo of the contraption is included.

I am glad that you lowered to that voltage.
In the morning I will post the first circuit I am going to try. If you have a schematic of your combination of resistances and the LM317, can you post it?

I included the Graphic I used that time to get the values. To get 13 volts I used 2400ohms as R2.

Jesus