piclist 1998\10\30\061958a >
Thread: Strobes
picon face BY : Peter L. Peres email (remove spam text)

On Thu, 29 Oct 1998, Andy Kunz wrote:

> >IR remote control leds run at that power level with a duty cycle of 10%
> >(3us on in 30us or so). They are quite happy with it. A PIC can easily do
> No, a std 38KHz IR is 8uS on and 26 off.  Check the NEC documentation, or
> just about any IR chip.

You can use 3 usec with the same parts. The range is slightly better, and
RFI is harder to control, but the FCC is far away from here ;)

> >commands. And where did you get the standard 30% from ? Is it an American
> >standard ?
> Japanese --> universal <G>

Ah, ok. ;)

> >I don't know what the sound level is, that you start out with. By the way,
> >did you say ELECTRIC ? Multi-pole electric motors with a switched
> Yes.  We race them at about 50mph around an oval.  We dump 2 AH in 90 seconds.

So dump 80 Amps into a 0.005 ohm connection wire. Gives 0.4V and it's not
DC ;)

> >is a way to build even electronic stabilizers like this. No, you don't
> Stabilizer?  ?

I mean regulator.

> >Another way to get at the frequency of a running DC motor is to put a
> >pickup coil on it. A phone suction cup coil should work and so should a
> The motor is 100' away traveling at 50mph.  Sound is the only possibility.
> I have a tach in my data logger (on board some boats, but not all have
> enough room), now I need an external one.

Radio. Get one of those wireless data module pairs and do something smart
with it. I guess the simplest way would be to buy a 'bug' transmitter kit
for FM and connect the mike input directly on the motor wire as described.
A pot may be required to get the volume down. A bug with AGC is better.
Then listen with a FM radio tuned to it. This should be small enough to
fit anywhere.



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