Re: Using piezoelectric to power a laser diode?

On Fri, 27 Jan 2006 07:05:46 -0600, John Fields
<jfields@xxxxxxxxxxxxxxxxxxxxx> wrote:

>On 26 Jan 2006 18:45:18 -0800, bobrich@xxxxxxxxx wrote:
>
>>Hi,
>>
>>I'm a complete novice/noob to electronics.
>>
>>I have a little project i'm working on, and would like to use a
>>piezoelectric power source to run a small visible laser diode for a
>>short duration (20-200ms). Does this seem feasible? The biggest
>>problem, from what i can tell, is the output voltage of the piezo is
>>likely to be much greater than the 2-3V i need to run the diode. The
>>other problem i'm having is actually finding suppliers of piezo devices
>>that would be suitable for this...all i can find are accelerometers and
>>strain gauges.
>>
>>Any thoughts? The energy source will be a sharp blow from a small
>>spring-loaded lever.
>
>---
>That won't work.
>
>Try this:
>
> Vcc Vcc
> | |
> [10K] [100K] +-------+
> | | |__ |
> +------[0.1µF]--+------|--O|TR OUT|O---[R]--+
> |- |A | | | |A
> [PIEZO] [1N4148] +---|TH | [LASER]
> |+ | | |_ | |
> GND GND +--O|D | GND
> | +-------+
> [1.5µF] 555
> |
> GND

---
Oops...

The 1N4148 _cathode_ should be connectedto the 10k resistor:


Vcc Vcc
| |
[10K] [100K] +-------+
| | |__ |
+------[0.1µF]--+------|--O|TR OUT|O---[R]--+
|- |K | | | |A
[PIEZO] [1N4148] +---|TH | [LASER]
|+ | | |_ | |
GND GND +--O|D | GND
| +-------+
[1.5µF] 555
|
GND

--
John Fields
Professional Circuit Designer
.

Relevant Pages

  • Re: Using piezoelectric to power a laser diode?
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