CD4541B Digital Timer

2 months ago 69
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

Description

Scrapped the analog design. Using a CD4541B programmable timer and external RC clock network (I can't find a clock IC low enough for a reasonable price), I think I have a device that works. Further on the bench testing is required. 

 

Updates: 

4/2/2021: Bench testing completed. 5 minute timer R_TC is 330 ohms, 2 hours is 9300 ohms. Began protoboard development. Difficulties with relay pin size resulted in undesired modifications. 

4/5/2021: Prototype build continued. 

4/6/2021: Removed IC mounting component from a previous timer and added to protoboard. Completed protoboard and began testing. 

4/7/2021: Protobard testing completed, things are working great. Need to adjust schematic to reflect component footprints. 

Documents

Sheet_1

PCB_Digital Timer

BOM

ID Name Designator Quantity
1 0.1u C1 1
2 10u C2 1
3 PN2222ATFR Q1 1
4 330 R1 1
5 2M R2 1
6 1k R3,R6 2
7 9500 R7 1
8 RELAY_SPDT_EE RLY1 1
9 DA-04BLP SW1 1
10 CD4541B U1 1
11 DB125-2.54-3P-GN U2 1
12 DB125-2.54-6P-GN U3 1

Attachments

Filename Download
Proto2.jpg
Proto1.jpg

Members

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