Difference between revisions of "Soldering 101"
From Fixme.ch
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== Circuit == | == Circuit == | ||
| − | * A discrete astable BJT multivibrator feeding into a | + | * A discrete astable BJT multivibrator feeding into a 74HC595 shift register, which drives the LEDs directly. |
| − | * The | + | * The shift register can serve up to 8 segments. |
| − | * The LED matrix can | + | * The LED matrix can partitioned arbitrarily column-wise: multiple columns can be grouped onto a single counter output. |
| − | * each | + | * 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 | * multivibrator speed can be adjusted with a pot | ||
* on/off switch? | * on/off switch? | ||
| Line 18: | Line 22: | ||
* LED, $0.04650 @ 1000: http://search.digikey.com/us/en/products/WP710A10SRD%2FD/754-1593-ND/2769819 | * LED, $0.04650 @ 1000: http://search.digikey.com/us/en/products/WP710A10SRD%2FD/754-1593-ND/2769819 | ||
| − | * | + | * 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 | * CR2032 holder, $0.4968 @ 100: http://search.digikey.com/us/en/products/3003/3003K-ND/227448 | ||
* 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 22:48, 22 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
- LED, $0.04650 @ 1000: http://search.digikey.com/us/en/products/WP710A10SRD%2FD/754-1593-ND/2769819
- 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
- PCB 5cm x 10cm, $1.498 @ 50: http://www.seeedstudio.com/depot/fusion-pcb-service-p-835.html
