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- Apr 30, 2013
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I'm planning a handheld build using a green diode (PL520) and li-ion batteries for power. Normally, I would just use one li-ion and a boost driver except that I would like to modulate the laser (at fairly slow rates of 1 - 20Hz).
Ideally, I would provide a pwm signal from an Arduino board so I could program a variety of patterns. However, this would require quite a bit of voltage for a handheld. The Arduino would require 7V and since I can't find a TTL capable boost driver, I'd need to supply an additional ~7V for the LD and 1.5V for a linear driver.
Could I get away with pulsing power to the driver since the frequencies are low? If so, I could just use a boost driver and the Arduino, lowering the required voltage. I could power the driver from Arduino's 5V regulator and use a transistor controlled by one of the digital I/O pins to switch power on/off to the driver. I would then only need to provide the 7V power for the Arduino.
Thoughts? Anyone know of a TTL capable boost driver? That would solve all my problems…
Thanks in advance...
Ideally, I would provide a pwm signal from an Arduino board so I could program a variety of patterns. However, this would require quite a bit of voltage for a handheld. The Arduino would require 7V and since I can't find a TTL capable boost driver, I'd need to supply an additional ~7V for the LD and 1.5V for a linear driver.
Could I get away with pulsing power to the driver since the frequencies are low? If so, I could just use a boost driver and the Arduino, lowering the required voltage. I could power the driver from Arduino's 5V regulator and use a transistor controlled by one of the digital I/O pins to switch power on/off to the driver. I would then only need to provide the 7V power for the Arduino.
Thoughts? Anyone know of a TTL capable boost driver? That would solve all my problems…
Thanks in advance...