I could have gone with any of them, so this a somewhat arbitrary choice. Inductors for small electronics like this should cost around 1-2, as a guideline. I also know that Maxim is great about sending samples so I decide to go with the MAX756 ( datasheet ) which.32/100. In this case, I'll charge.50. I also make the traces really large. Make sure you line up the white stripe on cape cod playhouse promo code the diode with the white stripe in the picture on the circuit board. I perform 4 tests with 2 inductors: 100mA load for both.5V in and 3V in (rechargeable and disposable batteries) and 250 load for both. For more info on 9V, read the duracell datasheet another problem with the 9V7805 scheme is that a 7805 is a linear regulator.
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I think the only thing that can really change this number a bit is the inductor. A duracell 9V provides -about- 500mAh over its lifetime. I know that the parts for the kit must be all through-hole (no surface mount) and easy to work with. Most people think of this last, and that's a bad idea. In general, I double the parts cost to come up with the 'retail' cost. Step 7: The Process: Rapid Prototyping In reality, what I did was look through the Digikey catalog, where I only found the DN7418 inductor (the other one was somewhat hidden in the RF inductor section). Step 12: Make: Parts Next, you'll need your parts Step 13: Make: Place Diode and Electrolytics Place the two electrolytic capacitors C2 and C3 and the diode. That's because the quiescent current of the MAX756 is very low, on the order of 100uA (0.1mA). Note that the PCB" doesn't include the 150 one-time tooling NRE fee, which adds 3 to the /50 price and.50 to the /100 price. Many of these parts are available in a place like 3m direct coupon code Radio Shack or other (higher quality) DIY electronics stores. Its not suggested ). So instead I take two large 100ohm 'power' resistors, and twist them together.