stroboscope schematic

[J4e8a16n]

Hi,

Can I create a stroboscopic lamp controlled by my signal generator  and a battery with a 12 V bulb?
The mosfet is a 2N7000

Should I use a transistor?

JP

[Zero999]

The 2N7000 is a transistor. It would be better if it's connected in series with the LED, rather than in parallel with it.

[J4e8a16n]

Thanks for your answer,

It works but the lamp is too slow.  I replaced it with a led.

But,   is there another kind of bulb that would produce more light and be more reactive?


JPD

[mcinque]

Leds are very fast, and can be very bright, depending the wattage you use. What kind of led are you using now?

If you want really a huge light, the fastest and brightest lamps are xenon bulbs, but of course that is a completely different schematics and you must be aware of potential issues (for example: very high voltages!)

[alsetalokin4017]

A high-efficiency LED is probably your best bet in such a simple circuit.

But you should drive your mini-mosfet with a square pulse instead of a sine wave. Vary the duty cycle too, for best results. For a good strobe effect (freezing motion, etc)  the "on" duty cycle should be very short.

I've made effective LED strobes using a 555  (either one-shot and externally triggered to synch to rotating machinery, or as built-in oscillator that can be set to arbitrary frequency). A 555 can be made to produce nice short pulses so that the strobe is effective in freezing motion.

For example see the circuit below. The basic timing signal (from signal generator, oscillator, or optical trigger, etc.) comes in to Pin 2,  and the circuit drives an ordinary high-efficiency 5mm LED with enough brightness and short pulse width to work as a small stroboscope.

[alsetalokin4017]

The 2N7000 is a transistor. It would be better if it's connected in series with the LED, rather than in parallel with it.

Yes, all mosfets are transistors, but not all transistors are mosfets!

The 2n7000 is an n-channel mosfet. A Metal-Oxide Semiconductor Field-Effect Transistor.

Many people just say "transistor" when they really mean "bipolar transistor" and just say "mosfet" when they really mean ... "mosfet".   

[mcinque]

you should drive your mini-mosfet with a square pulse instead of a sine wave. Vary the duty cycle too, for best results. For a good strobe effect (freezing motion, etc)  the "on" duty cycle should be very short.

excellent advice! 

[J4e8a16n]

Very good,

I will do that!

 
JPD