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Delay OFF Timer

1 year ago 388
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

Description

555 timer circuit for switching a light or other load on for a set time.

Documents

Sheet_1

PCB_2020-06-29_23-38-36

BOM

ID Name Designator Footprint Quantity
1 Switch,3*6*5Plastic head,260G, 0.25mm,SMD KEY1 KEY-SMD_L6.1-W3.7-P7.80-LS8.0 1
2 W06 D2 DIO-BG-TH_WOM 1
3 LM7812EE U3 TO220 1
4 555_BJT_EE U2 DIP8 1
5 307H-1AH-F-C-12VDC K1 RELAY-TH_307H-1AH-F-C-12VDC 1
6 VA15-V2S12 U4 PWRM-TH_VA15-V2XXX 1
7 470uF C3 CAP-D12.5×F5.0 1
8 BC547C Q2 BC547 1
9 DB128V-5.0-3P-BK GN1,GN2 CONN-TH_3P-P5.00_DB128V 2
10 220uF C2 CAP-D5.0×F2.0 1
11 1k R1,R3 R_AXIAL-0.4 2
12 1N4007 D1 DO-41_BD2.4-L4.7-P8.70-D0.9-RD 1
13 0.1uF C1 RAD-0.1 1
14 1M R2 RES-ADJ-TH_3386P 1

Attachments

None

Members

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Comments (1)

Markus_ee Reply

Hi!


A few dangerous aspects:


-No onboard fuse
-Neutral wire going to the transformer is dangerously close to the secondary pad (secondary trace going to the full bridge rectifier)
-Your text is on the copper layer intersecting mains wiring going to transformer (this text should be mover to the top silk layer)


Regards,
Markus Virtanen
HW / Electronics Designer

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