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test 2

1 year ago 461
  • Description
  • Documents
  • BOM
  • Attachments
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Description

My first PCB Design. It will be used in my learn to solder classes at my local public library. Many thanks to Ralph Bacon for the great YouTube tutorials to get me started.

The circuit uses a 555 timer IC in astable mode creating a high / low pulse on the pin 3 output. Using this calculator https://ohmslawcalculator.com/555-astable-calculator I was able to design the circuit to have an on / off period of between 650 ms and 1350 ms using the trim pot to vary the period.

I designed the output circuit so that half of the LEDs light on the high pulse using the 555 to source the current. The other half of the LEDs light on the low pulse with the 555 sinking the current. This takes advantage of the 555's ability to source as well as sink current on its pin 3 output and the LEDs unidirectional flow property to make the circuit work.

This circuit is based on other similar circuits found in books and on the internet. I take no credit.

Documents

Sheet_1

test2 pcb

wreathPCB

wreath2

wreathunsigned

wreathunsigned2

BOM

ID Name Designator Footprint Quantity BOM_Manufacturer Part BOM_Manufacturer BOM_Supplier BOM_Supplier Part
1 1K R6 AXIAL-0.4 1 MFR0W4F1001A50 UniOhm LCSC C57435
2 NE555P U1 DIP-8_L9.8-W6.6-P2.54-LS7.6-BL 1 NE555P TI LCSC C46749
3 SS-12F44-G5 SW1 SW-DIP-12.1X5.6 1 SS-12F44-G5 Rectangular Connectors - Contacts LCSC C136718
4 10uF C2 CAP-TH_BD8.0-P3.50-D1.0-FD 1 ECRE0812100M161P00 Guangdong TOPAZ Elec Tech LCSC C156956
5 50K VR1 RES-ADJ_3362P 1 3362P-1-503 Chengdu Guosheng Tech LCSC C118910
6 47K R7 AXIAL-0.4 1 MFR0W4F4702A50 UniOhm LCSC C58605
7 LTL-4234 LED7,LED8,LED9,LED10,LED11,LED12 LED-5MM/2.54 6 LTL-4234 LITEON LCSC C115447
8 . H1,H2 HDR-TH_1P-P2.54-V-M 2 54101-T0600LF Amphenol ICC LCSC C240305
9 333-2SURD/S530-A3 LED1,LED2,LED3,LED4,LED5,LED6 LED-TH_BD5.9-P2.54-RD 6 333-2SURD/S530-A3 EVERLIGHT LCSC C87271
10 100 R2,R3,R4,R5 RES-TH_BD2.2-L6.5-P10.50-D0.6 4 MFR0W4F1000A50 UniOhm LCSC C57438

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