ice tube schematic

[blastoline]

I am assembling an ice tube kit. In the "design" section there are small schematics of different sub assemblies of the kit. I cannot find a reference to R5 and C7 and how these discrete components relate to the functioning of the kit.

[jarchie]

I believe there are links to the schematic/board on the downloads page:
http://www.ladyada.net/make/icetube/download.html

You'll probably also need Eagle to view the files:
http://www.cadsoftusa.com/download-eagle/?language=en

I'm not an electronics whiz, but C7 seems to be a capacitor to ensure sufficient power is available for the inductor pulses. And R5 is a pull-down for base of the boost-control transistor, ensuring that current will not flow through the inductor unless the ATmega outputs +5v on BOOST (PD6).

[adafruit_support_bill]

As jarchie says, these components are part of the boost circuit. C7 discharges through L1 to create the boost pulses. R5 pulls down the gate of Q2.

Eagle is a free download if you want to view the complete schematic and board-files.