| Electronics > Projects, Designs, and Technical Stuff |
| The (long) story of the relay clock |
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| Spemo:
sure, ease of servicing is the other thing. Honestly, I don't know how to design a proper PCB, and also, I don't know if it would work out - I'm sure I'd still have to solder in a huge amount of jumpers ....look at how bad the wires cross each other I'm don't know how to route this onto a PCB. I have a huge schematic for this - maybe someone can walk me through this? And the thing with the free time - well sure it takes up a lot of time to wire this all up - but that was the goal, to keep me busy :-+ Thank you for the nice comments, I'm happy that you guys like it |
| digsys:
Can you post a link to the schematic, and give part# details of the relays / components used? Maybe someone can help |
| rs20:
--- Quote from: Spemo on July 26, 2019, 06:18:47 am ---sure, ease of servicing is the other thing. Honestly, I don't know how to design a proper PCB, and also, I don't know if it would work out - I'm sure I'd still have to solder in a huge amount of jumpers ....look at how bad the wires cross each other ... I'm don't know how to route this onto a PCB. I have a huge schematic for this - maybe someone can walk me through this? --- End quote --- So don't let me tell you how to live your life, I'm just foolin' around. But if I wanted to do something like this, this is one of those situations where autorouters* would be great. The clock speeds are low so there's really no such thing as a "poor PCB layout". So I'd capture the design in KiCad (or, if I already had the schematic like you, just use the corresponding netlist I suppose), lay out the components in the PCB editor, and then figure out how to use an autorouter (either the one in KiCad or some third party situation.) You'd be surprised at the complex connectivity you can achieve with a 4- or even 2-layer PCB, especially when the relays you're using have such an incredibly huge pin pitch compared to modern components. Having said all that though, this is probably not the best "Learning how to make PCBs 101" project. At all. You'd want to gain experience doing a simple, 2-relay, manually routed board first just so that you're not completely confounded when dealing with hundreds of parts. * A feature of PCB tools which lets you place all the components wherever you like, and it figures out how to lay out all the traces for you. Also, a feature which is widely maligned as cheap way out, although I think there are still niche situations where they are applicable. |
| Henrik_V:
A trick I was told by the son of Konrad Zuse (Build the first relay computer Z3) that his father used to extend relay contact livetime (at that time) and bouncing contact problems: He tried to switch as much relays as possible without power at the contacts. |
| schmitt trigger:
When I see such a complex project completed and operational, all I can say is: "I am not worthy of tying your shoe laces!" ;) Seriously, my sincerest congratulations and respects. :-+ One comment about your video: it seems that there are sudden brightness jumps on the LEDs. Having attempted to video record LED displays, I know that sometimes the camera's auto-exposure function gets confused by the extreme contrast and will cause this. Are the brightness jumps real, or is it a camera exposure artifact? |
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