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Created page with "[[Category:Workshops]] == 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 op..."
[[Category:Workshops]]
== 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 johnson decade counter, which drives the LEDs directly.
* The counter can serve up to 10 segments.
* The LED matrix can partitioned partitioned arbitrarily column-wise: multiple columns can be grouped onto a single counter output.
* each counter output has one series current limiting resistor
* last (unused) counter output feeds back to reset
* multivibrator speed can be adjusted with a pot
* on/off switch?
== Components ==
* LED, $0.04650 @ 1000: http://search.digikey.com/us/en/products/WP710A10SRD%2FD/754-1593-ND/2769819
* CD74HC4017 decade counter, $0.4776 @ 50: http://search.digikey.com/us/en/products/CD74HC4017E/296-25989-5-ND/480317
== 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 johnson decade counter, which drives the LEDs directly.
* The counter can serve up to 10 segments.
* The LED matrix can partitioned partitioned arbitrarily column-wise: multiple columns can be grouped onto a single counter output.
* each counter output has one series current limiting resistor
* last (unused) counter output feeds back to reset
* multivibrator speed can be adjusted with a pot
* on/off switch?
== Components ==
* LED, $0.04650 @ 1000: http://search.digikey.com/us/en/products/WP710A10SRD%2FD/754-1593-ND/2769819
* CD74HC4017 decade counter, $0.4776 @ 50: http://search.digikey.com/us/en/products/CD74HC4017E/296-25989-5-ND/480317
