DC SSR - Assembly questions

fj · 06-27-2010, 03:04 AM

Hi everyone,

I am in the middle of assembling 32 DC SSR's. I've come to a road block and just wanted to clarify a couple of things as the instructions in the wiki are not real clear. I have the v1.1 boards but the picture in the wiki is the v1.0 board so I'm a bit confused about what to do.

1. The 50volts 0.1uF capacitors on the picture in the wiki go into C1 but on my boards I have two places where it looks like they could go, either C1 or C2. Which one is it, or is it both?

2. With the capacitors from question 1, they have two legs but there are three holes at C1 and C2 so which two holes do I put them in to?

3. Do the 5V 100mA linear regulators go into U1 or U2? I'm guessing that it's U2 because the shape in the board matches the shape of the part itself, but when i tried to put it into U2, the holes were too close together for the actual part and so the legs were getting bent in towards each other quite a lot so I wasn't sure if it was right or not.

thanks, fj

**budude** · 06-27-2010, 03:25 AM

This has come up before - see if this helps: http://doityourselfchristmas.com/for...st.php?p=76801

I guess the Wiki never got updated...

**polar bear** · 06-27-2010, 06:28 AM

i havent started to build mine yet but if you go to the forum
scroll down to SSR go to page six and find 'DCSSR Question' you might find the answer to you question. good luck

**smartalec** · 06-27-2010, 06:55 AM

Originally Posted by fj

Hi everyone,

I am in the middle of assembling 32 DC SSR's. I've come to a road block and just wanted to clarify a couple of things as the instructions in the wiki are not real clear. I have the v1.1 boards but the picture in the wiki is the v1.0 board so I'm a bit confused about what to do.

1. The 50volts 0.1uF capacitors on the picture in the wiki go into C1 but on my boards I have two places where it looks like they could go, either C1 or C2. Which one is it, or is it both?

I ended up putting one in c1 an c2

Originally Posted by fj

2. With the capacitors from question 1, they have two legs but there are three holes at C1 and C2 so which two holes do I put them in to?

the outer holes was easer

Originally Posted by fj

3. Do the 5V 100mA linear regulators go into U1 or U2? I'm guessing that it's U2 because the shape in the board matches the shape of the part itself, but when i tried to put it into U2, the holes were too close together for the actual part and so the legs were getting bent in towards each other quite a lot so I wasn't sure if it was right or not.

thanks, fj

i put it in U1 just cause it went in easer, same direction as U2

There's also a big difference if you got for a ver 1.5 board
but i have the same ver 1.1 boards as you.

the problem i see with ver 1.1 boards is that it gets supplyed 5v from the ren board then that 5v then goes into the regulators on the DCSSR boards
i saw that ver 1.5 boards they have fixed this an they get the supply for the regulators from the main power feed into the dcssr.

hope this helps.
alec

fj · 06-27-2010, 09:45 AM

thanks for the help, that should sort things out.

i found another thread after a bit of digging around that shows a good picture of the DC SSR constructed, hope it helps someone else out.

http://doityourselfchristmas.com/for...ead.php?t=6718

**wjohn** · 06-27-2010, 06:10 PM

The current version of the board is 1.1, not 1.5.

The board was designed to take either a TO92 cased 78L05 or TO220 cased 7805. This was to give people choices.

Same with C1 and C2. The three holes allow for a variety of cap lead spacings. Mono 0.1 uF caps I have come with lead spacing of .1, .2, .3 Adding the extra hole gives you the option to use what you have.

The power feed for the regulator has always come from the DC load side. This is for galvanic isolation

**plasmata** · 06-28-2010, 12:11 AM

Still wondering if you have to put caps in both C1 and C2.

**wjohn** · 06-28-2010, 12:19 AM

Originally Posted by plasmata

Still wondering if you have to put caps in both C1 and C2.

Hi,

by the datasheet for the regulator, there should be a 0.33uF cap on the input to the 78L05. (thats C2 on the overlay). The function of C2 is to stop the Reg from oscillating. Depending on the manufacturer, the value can be in the range of .1 uF upwards. Again, depending on the manufacturer's datasheet, C1 may be included as well.

In summary, C2 'should' be included, C1 'may' be included on the board.

I am just updating my web pages at the moment,

http://www.xmasinmelb.com/dcssr/

and have the link to the Mouser BOM, and the details of C1 and C2 listed. Then I'll go back and redo the WIKI

**smartalec** · 06-28-2010, 12:42 AM

would it make too much of a differance if i used the .1uf for both c1 an c2?
or would it be best to replace c2 with a .33uf ?
thanks alec

Originally Posted by wjohn

Hi,

by the datasheet for the regulator, there should be a 0.33uF cap on the input to the 78L05. (thats C2 on the overlay). The function of C2 is to stop the Reg from oscillating. Depending on the manufacturer, the value can be in the range of .1 uF upwards. Again, depending on the manufacturer's datasheet, C1 may be included as well.

In summary, C2 'should' be included, C1 'may' be included on the board.

I am just updating my web pages at the moment,

http://www.xmasinmelb.com/dcssr/

and have the link to the Mouser BOM, and the details of C1 and C2 listed. Then I'll go back and redo the WIKI

**wjohn** · 06-28-2010, 02:10 AM

you can use just a 0.1uF for C2, or 2 x 0.1 uF for C1/2 or most other options. The 78L05 is fairly stable, and the cap is there 'just to be sure'. If you dont have a 0.33uF, you can use a small electro as well, just make sure the operating voltage is OK for the DC supply (30 V for 24 VDC operating range).