Hi all,
I am working on a lighting project for my a level product design coursework and I am in desperate need of some advice/help on how to build the circuit. It involves powering and dimming a 300mm 12v strip of leds that are 14.4 wpm/0.3 = 4.3w, all in a very small space of 35x35x90mm. At the moment I am planning on using a 3.7v 500mAh li-ion battery (could I connect multiple of these in series or parallel??) connected to a li ion battery charger (that can charge the battery while it powers the components). The voltage will be stepped up to 12v using a boost converter, these seem to be widely available in 3.7v-12v but not so widely available in lets say 7.4v-12v or 11.1v-12v; maybe is there an alternative to a boost converter that would fit in this space? I have decided to use PWM to dim the lights instead of a potentiometer to get a Better range of brightness. however I don't know if the one I have chosen is compatible with my circuit (see component spec below). Also I don't know if I need a buck converter to drop the voltage back down before it goes back into the battery.
see drawing of my lamp and my rough circuit plan below.
I would really appreciate any advice anyone could give me to get this circuit to work as my deadline is aproaching fast and I need to order these components so I can build the light.
Thank you
see sources of my components, drawing of my lamp, PWM dimmer spec and my rough circuit plan below:
sources for my components:
Led Strip: Maplin, no link available apparently
Li ion Battery: https://www.adafruit.com/products/1578
Battery Charger: https://www.adafruit.com/products/259
Boost converter: http://www.ebay.co.uk/itm/like/2718...=9045991&device=c&campaignid=207297426&crdt=0
PWM dimmer:http://www.ebay.co.uk/itm/like/1824...=9045991&device=c&campaignid=738474636&crdt=0

I am working on a lighting project for my a level product design coursework and I am in desperate need of some advice/help on how to build the circuit. It involves powering and dimming a 300mm 12v strip of leds that are 14.4 wpm/0.3 = 4.3w, all in a very small space of 35x35x90mm. At the moment I am planning on using a 3.7v 500mAh li-ion battery (could I connect multiple of these in series or parallel??) connected to a li ion battery charger (that can charge the battery while it powers the components). The voltage will be stepped up to 12v using a boost converter, these seem to be widely available in 3.7v-12v but not so widely available in lets say 7.4v-12v or 11.1v-12v; maybe is there an alternative to a boost converter that would fit in this space? I have decided to use PWM to dim the lights instead of a potentiometer to get a Better range of brightness. however I don't know if the one I have chosen is compatible with my circuit (see component spec below). Also I don't know if I need a buck converter to drop the voltage back down before it goes back into the battery.
see drawing of my lamp and my rough circuit plan below.
I would really appreciate any advice anyone could give me to get this circuit to work as my deadline is aproaching fast and I need to order these components so I can build the light.
Thank you
see sources of my components, drawing of my lamp, PWM dimmer spec and my rough circuit plan below:
sources for my components:
Led Strip: Maplin, no link available apparently
Li ion Battery: https://www.adafruit.com/products/1578
Battery Charger: https://www.adafruit.com/products/259
Boost converter: http://www.ebay.co.uk/itm/like/2718...=9045991&device=c&campaignid=207297426&crdt=0
PWM dimmer:http://www.ebay.co.uk/itm/like/1824...=9045991&device=c&campaignid=738474636&crdt=0


