Difference between revisions of "Soldering 101"

Revision as of 21:42, 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
 * 74HC595N,112, $0.378 @ 100: http://search.digikey.com/us/en/products/74HC595N,112/568-1484-5-ND/763088
 * CR2032 holder, $0.4968 @ 100: http://search.digikey.com/us/en/products/3003/3003K-ND/227448