Difference between revisions of "Soldering 101"

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* Pushbutton, $0.0916 @ 100: http://search.digikey.com/us/en/products/FSM4JH/450-1650-ND/1632536
 
* Pushbutton, $0.0916 @ 100: http://search.digikey.com/us/en/products/FSM4JH/450-1650-ND/1632536
 
* Pot, $0.3197 @ 100: http://search.digikey.com/us/en/products/3306P-1-105/3306P-105-ND/84994
 
* Pot, $0.3197 @ 100: http://search.digikey.com/us/en/products/3306P-1-105/3306P-105-ND/84994
 +
* Jumper, $0.04516 @ 500: http://search.digikey.com/us/en/products/NPC02SXON-RC/S9341-ND/2618266
 
* PCB 5cm x 10cm, $1.498 @ 50: http://www.seeedstudio.com/depot/fusion-pcb-service-p-835.html
 
* PCB 5cm x 10cm, $1.498 @ 50: http://www.seeedstudio.com/depot/fusion-pcb-service-p-835.html

Revision as of 22:20, 26 January 2012


Intro to through-hole soldering

We will solder a blinking, customizable name tag. We will also discuss and explain the design and the theory of operation.

Circuit

  • A discrete astable BJT multivibrator feeding into a 74HC595 shift register, which drives the LEDs directly.
  • The shift register can serve up to 8 segments.
  • The LED matrix can partitioned arbitrarily column-wise: multiple columns can be grouped onto a single counter output.
  • each shift register output has one series current limiting resistor
  • multiple display modes:
    • blink (CLK goes into enable)
    • fill slowly, clear slowly (last output inverted feeds back)
    • fill slowly, clear at once (last output inverted goes to reset)
    • rotate (last output feeds back)
  • multivibrator speed can be adjusted with a pot
  • on/off switch?

Components

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