Timed Relay On with Momentary Digital Encoder Push Button

[LarryD]

@k1rkj

2N3904

• When looking at a schematic, you are responsible to confirm the foot print pin numbers of the transistor which you have.

• The Base, Emitter and Collector are correctly connected as shown in the schematic.

• You must always make sure the actual pin numbers agree with your part.
  i.e. Your base is pin #2, your Emitter is pin #1 and your Collector is pin #3, design your PCB based on the data sheet for your transistor.

• Your 2nd image looks suspicious with the base traces, the display footprint looks too small.

• Always run DRC on the PCB to confirm routing.

• suggest for just a one of project you use point to point wiring on a prototyping board.

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Review Post #1072

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Making a Reasonable looking Test Jig The following images show how to build a test jig. [A] Design your front panel layout. Print a 1:1 paper copy and add double stick tape. Laminate. [B] [C] [D] [E] [F] [G] Enlarge the holes for your LEDs switches etc. [H] [I] [J] [K] See this post for soldering the proto board components:

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Review Post #1061

Share tips you have come across

Soft Hold Down Attachment for Component Soldering Further to Post #813 The old sharp tipped Hold Down tool, works well for most SMD components like 1206s etc. When it comes to bare wire busbars or MELF diodes, it can be quite challenging to solder them properly on your prototype PCBs. The following images describe how to fabricate a new attachment that makes your soldering jobs easy and faster. [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K]