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The (long) story of the relay clock
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macboy:
The high power consumption and the fading/failing LEDs is caused by not having current limiting resistors on the LEDs. You are directly driving them from the power supply, which is a bad idea.  LEDs designed to be driven directly by 5 V or 12 V are avaialble (with built in current limiting resistors) but I don't think that's what you are using.
Spemo:

--- Quote from: macboy on July 29, 2019, 08:29:04 pm ---The high power consumption and the fading/failing LEDs is caused by not having current limiting resistors on the LEDs. You are directly driving them from the power supply, which is a bad idea.  LEDs designed to be driven directly by 5 V or 12 V are avaialble (with built in current limiting resistors) but I don't think that's what you are using.

--- End quote ---

they all have current limiting resistors - the values of the resistors are calculated to run them at around 10-15mA per LED(don't remember exactly). They can handle 20mA without a problem, but I don't want to run them that hard.
Spemo:
Hey everyone....

Since I still have to wait atleast a week to get all the parts for CV8, I decided to build another CV7....I don't know why, but I guess I don't have anything else to do....

This time I'd like to show you step by step, and also keep track of the time spent building this thing, since I have no idea how long it really takes.

So lets start.

The first thing that had to be done was to modify standard 16pin IC-Sockets by removing not needed connections.

I decided to put all the relays back into sockets, since the relays do fail some day, and also, because I went the cheap way, I ordered the cheapest and got relays that have been desoldered somewhere.
They are chinese relays either way (new or not, named HK19-F), I have no idea how old they are and how many cycles they went through. Desoldering them when they fail is a huge pain and also ruins the copper pads on the perfboard. So sockets it is, not as stable, but easy to service.

So, they had to be soldered onto the Perfboard:




Modifying, soldering and aligning them to sit straight took about 3 hours.

Then, the transistors for the counter modules had to be soldered in:



The resistors and capacitors followed:

 

The not so nice soldering ( I have shaky hands, so this is as good as it gets):




and at last for today, all the flyback diodes:




Total time spent building this so far: 6 Hours.


Now, I'm not rushing this build, in my experience, doing this quickly ends up in a lot of errors and mistakes. So we'll see how long this takes.

If you have any questions, fell free to ask them.

Have a nice day

Daniel
schmitt trigger:

--- Quote from: Spemo on July 29, 2019, 11:12:43 pm ---

Now, I'm not rushing this build, in my experience, doing this quickly ends up in a lot of errors and mistakes. So we'll see how long this takes.

Daniel

--- End quote ---

Sage words. Rushing any project, specially a complex one like this, is a certain recipe for disaster.

Emphasis is mine.
Spemo:
Hello again,
today I carried on with the build of CV7#2.

first, the power and ground lines were soldered in.
Then, the output posts were put in.
after that, the connections from the transistors to the relays were made, then the connections from the top row of the relays to the bottom.

The next step is already prepared, I had to cut 44 short wires. They will mostly complete the counting modules, but you'll see.

       

Time spent for the progress today : 3 hours

Total time spent building this: 9 hours


havea nice day


Daniel
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