Posted by Jordan on September 20, 2007, 4:18 am
tallex wrote:
>
> I wired a 50mfd electrolytic across the output with an
> ne2 neon light. The cap charged up, flashes the neon and applies the
> braking action with increasing wind..the back emf works like a charm
> to shunt down the speed of the props totally automatically.
That's interesting. The generator would have DC output, to charge the cap?
Is neon light in series with cap?
Thanks
Jordan
Posted by Arnold Walker on September 22, 2007, 12:22 pm
>-> David Williams wrote:
> -> >
> -> > Much better, make a circuit with a zener diode, a power transistor,
> and
> -> > a couple of resistors, one of which should be capable of dissipating
> as
> -> > much power as needed.
> -> Thanks Dave
> -> I've copied that and will forward to the electronics guy.
> -> Jordan
> I think I guessed that R1 should be something like 100 ohms. On second
> guess, I think it should be closer to 10 ohms, or maybe even less. It
> will be receiving only a few volts from the bridge, and we want it to
> be able to dissipate a few watts, which is what the decorative windmill
> will probably produce.
> Actually, you might be able just to put a zener across the bridge
> output. If it's chunky enough to be able to dissipate a few watts
> (probably mounted on a heat sink), it may be all you need.
> dow
Sounds like dynamic(regenerative to green guys) braking on a railway
locomotive on a smaller scale.
>
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> I wired a 50mfd electrolytic across the output with an
> ne2 neon light. The cap charged up, flashes the neon and applies the
> braking action with increasing wind..the back emf works like a charm
> to shunt down the speed of the props totally automatically.