License

GPL 3.0

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BJT 555 timer

2 years ago 913
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

Description

This is a fully functional 555 timer project using publicly available bipolar transistors. The project uses 24 transistors. The resistance values are taken from the datasheet and are slightly shifted towards the more accessible series of values. There are three test points.

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The PCB design process can be seen on youtube BJT 555 timer

Documents

Sheet_1

Big 555 WIP

BOM

ID Name Designator Footprint Quantity BOM_Manufacturer Part BOM_Manufacturer BOM_Supplier BOM_Supplier Part
1 C945B Q5,Q6,Q7,Q8,Q16,Q17,Q18,Q19,Q20,Q21 TO-92-3_L4.9-W3.7-P1.27-L 10 C945B FeiHong LCSC C438764
2 BC557 Q1,Q2,Q3,Q4 TO-92-3_L4.9-W3.7-P1.27-R 4 BC557 CJ LCSC C180418
3 S9015_C21390 Q14,Q15 TO-92-3_L4.9-W3.7-P1.27-L 2 S9015 CJ LCSC C21390
4 4.7K R1,R3,R4,R5,R6,R7,R10,R13,R14 RES-TH_BD4.5-L11.5-P15.50-D0.8 9 MFR2WSFTE73-510K YAGEO LCSC C173094
5 820 R2 RES-TH_BD4.5-L11.5-P15.50-D0.8 1 MFR2WSFTE73-510K YAGEO LCSC C173094
6 1K R8 RES-TH_BD4.5-L11.5-P15.50-D0.8 1 MFR2WSFTE73-510K YAGEO LCSC C173094
7 100K R9,R16 RES-TH_BD4.5-L11.5-P15.50-D0.8 2 MFR2WSFTE73-510K YAGEO LCSC C173094
8 15K R11 RES-TH_BD4.5-L11.5-P15.50-D0.8 1 MFR2WSFTE73-510K YAGEO LCSC C173094
9 6.8K R12 RES-TH_BD4.5-L11.5-P15.50-D0.8 1 MFR2WSFTE73-510K YAGEO LCSC C173094
10 220 R15 RES-TH_BD4.5-L11.5-P15.50-D0.8 1 MFR2WSFTE73-510K YAGEO LCSC C173094
11 100 R17 RES-TH_BD4.5-L11.5-P15.50-D0.8 1 MFR2WSFTE73-510K YAGEO LCSC C173094
12 Header-Male-2.54_1x1 P1,P2,P3,P4,P5,P6,P7,P8,TP1,TP2,TP3 HDR-1X1/2.54 11 Header-Male-2.54_1x1 ReliaPro LCSC C81276
13 S8050 Q22,Q23,Q24 TO-92(TO-92-3) 3 S8050 CJ LCSC C8327
14 C9012B Q25 TO-92-3_L4.9-W3.7-P1.27-L 1 C9012B FeiHong LCSC C438777
15 2SA1015-TA Q9,Q10,Q11,Q12,Q13,Q26 TO-92-3_L4.8-W3.7-P2.54-L 6 2SA1015-TA Changjiang Electronics Tech (CJ) LCSC C160132

Attachments

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