wavebubble:battery
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| * If you're not using the USB-port debugging console (say you have a spectrum analyzer or you're making a bunch and reusing one board multiple times or have a ttl-serial converter) then you can leave out the FTDI chip (and USB connector) | * If you're not using the USB-port debugging console (say you have a spectrum analyzer or you're making a bunch and reusing one board multiple times or have a ttl-serial converter) then you can leave out the FTDI chip (and USB connector) | ||
| * If you're planning to power from some other source note that since Vin has to be boosted to 5V the voltage input should be 3.5V-5V. | * If you're planning to power from some other source note that since Vin has to be boosted to 5V the voltage input should be 3.5V-5V. | ||
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| ^Part no.^Name^Description^Distributor^Qty^Cost^Total^ | ^Part no.^Name^Description^Distributor^Qty^Cost^Total^ | ||
| |Battery|-|3.7V/1.2Ah Lithium Ion or Lithium Polymer battery|Battery Space (for example)|1|~$8|~$8| | |Battery|-|3.7V/1.2Ah Lithium Ion or Lithium Polymer battery|Battery Space (for example)|1|~$8|~$8| | ||
| + | |Battery Protection Circuit|-|Circuitry to keep battery safe (optional but recommended)|Battery Space|1|$1.30|$1.30| | ||
| + | |*LM3622M-4.2|IC1|Battery charger chip for 3.7V lithium battery|Digikey Sample|1|$2.64|$2.64| | ||
| + | |Hirose UX60-MB-5ST or *Molex 54819-0572|J1|Mini-B USB connector (SMT)|Digikey Mouser Sample|1|$0.96|$0.96| | ||
| + | |163-2217|J2|1.7mm x 5.2mm SMT DC power jack|Mouser|1|$0.77|$0.77| | ||
| + | |STN749|Q1|PNP 1A power transistor (SOT223)|Digikey|1|$0.79|$0.79| | ||
| + | |FT232RL|IC2|USB/ttl interface chip (optional)|Mouser|1|$0.30|$0.30| | ||
| + | |SS14 (for example)|D1|Schottky Diode (at least 1A/20V)|Mouser Digikey|1|$0.16|$0.16| | ||
| + | |LTST-S320GKT|LED1|LED (1206) any really, but the recommended one is right-angle mount|Digikey|1|$0.16|$0.16| | ||
| + | |UWX1C470MCL1GB|C1|Input power filter capacitor (47uF/16V minimum)|Mouser|1|$0.18|$0.18| | ||
| + | |B45197A1157K409 (tantalum) UWT0J221MCL1GB (electrolytic)|C2|Battery filter capacitor (100uF/6.3V minimum)|Digikey, Mouser|1|$0.28|$0.28| | ||
| + | |0.1uF 1206 ceramic capacitor|C3- C7|High frequency bypass capacitor (~.1uF 16V minimum)|Mouser|5|$0.08|$0.40| | ||
| + | |0.22 1/4W resistor in 1206 pkg|R1|Changer current sense resistor 0.22ohm allows ~450mA charge current which is the USB max.|Digikey, Mouser|1|$0.32|$0.32| | ||
| + | |2K 1/4W resistor in 1206 pkg|R2|LED choke resistor (~1K depending on LED and brightness)|Mouser|1|$0.08|$0.08| | ||
| + | |Total|-|-|-|-|-|$12-$20| | ||
| + | * Can be sampled for free at low quantities | ||
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| + | ==== Parts List - AAA Battery Pack ==== | ||
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| + | ^Part # & Datasheets^Name^Description^Distributor^Qty^Cost^Total^ | ||
| + | |Batteries|--|3 alkaline AAA Batteries|Anywhere|3|$0.50|$1.50| | ||
| + | |Batteries(alt.)|--|3 NiMH rechargable AAA batteries|Battery Space (for example or Radioshack, etc|3|$1.25|~$3.75| | ||
| + | |12BH431P|--|3 AAA battery holder |Digikey Mouser|1|$0.89|$0.89| | ||
| + | |Hirose UX60-MB-5ST or *Molex 54819-0572|J1|Mini-B USB connector (SMT)|Digikey Mouser Sample|1|$0.96|$0.96| | ||
| + | |FT232RL|IC2|USB/ttl interface chip (optional)|Mouser|1|$4.10|$4.10| | ||
| + | |B45197A1157K409(tantalum) UWT0J221MCL1GB(electrolytic)|C2|Battery filter capacitor (100uF/6.3V minimum)|Digikey Mouser|1|$0.28|$0.28| | ||
| + | |0.1uF 1206 ceramic capacitor|C4-C7|High frequency bypass capacitor (~.1uF 16V minimum)|Mouser|5|$0.08|$0.40| | ||
| + | |Total|--|--|--|--|--|$3-$10| | ||
| + | ==== Assembly ==== | ||
| + | |{{wavebubble:1.jpg|}}|Place the PCB in your vise. For this assembly diagram I will use the lithium ion board, the AAA board is easier.| | ||
| + | |{{wavebubble:2.jpg|}}|Solder in the DC jack and the FTDI chip. Solderpaste is suggested here.| | ||
| + | |{{wavebubble:3.jpg|}}|Solder in the USB jack. You can now test whether this works by plugging it into a computer.| | ||
| + | |{{wavebubble:4.jpg|}}|Solder in the rest of the components, the low power charging circuitry is not necessary. | | ||
| + | |--|If you are using a battery without protection circuitry, attach it. Solder in the battery. The left pad is + and the right pad is -. | | ||
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