Difference between revisions of "Soldering 101"

Latest revision as of 20:04, 16 May 2012

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

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?

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 * LED, $0.04650 @ 1000: http://search.digikey.com/us/en/products/WP710A10SRD%2FD/754-1593-ND/2769819
-* CD74HC164EE4-ND $ 0.30994 @ 100 :http://www.digikey.ch/product-detail/de/CD74HC164EE4/CD74HC164EE4-ND/1506713
+* CD74HC164EE4-ND $ 0.30994 @ 100: http://www.digikey.ch/product-detail/de/CD74HC164EE4/CD74HC164EE4-ND/1506713
+* DIL14 Sockets @ 100: http://www.digikey.ch/product-detail/de/1-390261-3/A100205-ND/1125623 (Easier to change the IC if you kill it (wrong wiring, wrong polarity may kill the IC...))
+* 100nF (long leads) Capacitors @ 100: http://ch.farnell.com/multicomp/mc0805224z500a5-08mm/capacitor-ceramic-0-22uf-50v5v/dp/1694344 (Pour le découplage de l'alim près des IC, à monter sur les sockets)
 * CR2032 holder, $0.4968 @ 100: http://search.digikey.com/us/en/products/3003/3003K-ND/227448
 * Pushbutton, $0.0916 @ 100: http://search.digikey.com/us/en/products/FSM4JH/450-1650-ND/1632536