New PCB's for Tube Radio Filter Capacitor and Selenium Rectifier replacement
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- Опубликовано: 15 апр 2023
- Only $5 for 10 PCBs and every new member get $5 bonus. + Express 24 hour / 48 hour service on www.pcbway.com/ I previously did a project in which I created small PCB's to use in replacing the filter capacitors and selenium rectifiers when restoring tube radios. These boards were used quite a lot, but, as usual, I wasn't entirely happy with certain aspects of the boards. Some of the solder pads were too small, and size constraints regarding the useable capacitors needed addressing. That is why I decided to do this again.
I will be sharing the Gerbers on PCBWay's Share section of their website if you wish to order your own. I will post the links to the shared projects below as soon as I have assurance that there are no issues with the boards.
Hope you enjoy the video.
You can now support the channel:
/ mcaldeira
paypal.me/macaldeira
Other channels mentioned in this video:
@DavidTipton101
#tuberadios #antiqueradio #radiorestoration
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I agree with the idea of adding pads for line to line and line to ground X1/X2 safety caps. This is a great little radio improvement.
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Nice upgrade! Thanks for the look and listen.
Pleasure
You right about getting PCB's made, as I have almost 10 different prototype boards here waiting to get made. Where I would like to get one of each, but PCBway has a minimum order of five, that makes prototyping hard to do, unless you can find someone who is interested in doing the same type of projects.
True
I have developed the habit of using square pads to identify positive connections for caps and diodes. True that the silkscreen already makes that obvious, but it does encourage me to double check when installing a part.
Actually, I’ve got into the habit of using square pads for negative. Don’t know where I got that from 😊 mix a Portuguese and South African, and things get crazy 😊
@@electronicsoldandnew I picked up the +/square habit from a couple of commercial PCBs, and said, "OK, that's a standard." There are so many standards to choose from!
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Looks great. You think it through and your PCB designs are getting better and better. I suspect that when you need a cap that is not to ground you use a cap alone . Some times not all caps are to ground. Like what you do and I will use it when I get on to my projects. Thanks.
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Cool desing. Nevertheless I would highly recommend a larger gap, or even better, an isolation slot between the AC inputs and the rest. Especially when you choose to use a rectangular solderpad.
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I Agree with Grant on the "excess" of making a 5 board order created to just proto something to do "proof of concept" testing, footprint accuracy, and making sure locations work well before making a bigger order. PCBWay has offered to work with me on discounts for promoting them, but, to be honest, I would rather try to keep some money and work in the US, even though they (PCBWay) does waaay undercut most any US PCB service for a basic 1.6mm / 1oz copper, 2 layer board. If you go to thicker boards and heavier copper, the PCBWay pricing goes up to the point that some US services are fairly competitive. Someday, hopefully, some service will offer a " 1 board prototype" pricing level that is attractive enough to draw customers. I also always try to pick components with a "3D CAD" drawing, and then check the 3D (I like using "EasyEDA") view to make sure things fit well, it is a great tool to check some things before making orders. As far as component holes and pads, some footprints tend to oversize the holes a bit, I've checked some general specs on lead diameters vs hole sizes, and a good sizing is about 10-15% larger hole than the lead diameter. Anything too much larger and you are filling in a larger void with solder, and risking joint cracking over time and thermal cycling.
I try to do 3D trials to avoid errors, but they do creep in. In Portugal the options open to me for pcb manufacturing are literally none 😊 so the choice is easy.
Hi Manuel. Many thanks for all the great videos. I was checking PCBWay for the updated shared design. I haven't been able to find it. Perhaps I have simply missed it. Have you uploaded the changed board design?
Haven’t updated yet. Should happen soon after I test new boards.
Hmm very interesting Manuel, i have a Grundig 2220 CA (designed for the Canadian market at 115v) on the bench at the moment, didn't start working on it yet as i'm waiting for vacuum tubes, but i suspect the selenium rectifier will need to go, i wonder if one of your boards would do the trick. Schematics says the Sel Rect is a B250 C75, but since i didn't pull the chassis out yet i have no idea what the rectifier's form factor is. Guess i'll have to wait until i get a visual on it, but your boards are just brilliant. Thank's for racking your brains for us 🙂
Should work on that radio. Just be careful if you order the boards because the price can be a little high due to the various cutouts and rounded sections.
Ok Man, thanks for the speedy reply and the head up, have a great day.
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Per the engineering department at ECG back in the late 70's the full length of the leads must be used to achieve the full rating on the diodes.. The leads are part of the heatsinking for the diode. We kept blowing rectifiers in an electronic organ. Current draw was close to the max rating. After blowing 2 bridges of diodes the tech called ECG and the above was his explanation. Using full length leads solved the problem. I always make loops in the leads and never have had a problem since finding this out.
I guess that makes sense, but here the current draw is minimal compared to the max rating, so should not be a problem.
Hi Mr. Caildeira, thanks for the video (and all the other one´s) 😉. Have You thought about mounting capacitors parralel to the diodes? They would get rid of switching sparks. and they would filter away any other hf noise. It´s been done in many Power supply´s. Jus a tip 😉. But i like very much to make Boards for replacing Filtercab´s and rectifiers.
A 0.1uF cap across each diode would indeed reduce some noise, but I haven’t noted the need in previous restorations.
Manuel nice PCBs , are you planning another version for selenium tube rectifiers?.Always a brilliant work,thanks in advance .🙂👋👋
The tube rectifiers are simpler: just replace with a diode or two, and a dropper resistor.
hello... a small suggestion... I would have inverted the position of the 2 lower diodes with the upper ones... in order to draw the track that goes towards the pad with the sign - initially vertical and then at 45° towards the pad ... this is to have more space around the clamping hole. (avoid that the spacer can in any way come into contact with the track). I don't know if I explained myself. Anyway great job
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If you don't do 3 on 1 board, would it be an idea to include ab isolation pcb in the design. Just a blanc piece with fitting holes or only ground tags
That would have been an idea
I apologize in advance but: If appropriate, please share which software you use to do your PCB layout. Some time ago I used Express PCB for boards by PCB express. Thank you in advance
Pls email me and I’ll give you the details.
What is the reason you take four separate diodes instead of a bridge rectifier?
E.g. this type: max 600V, max 80A, size 25mm x 15mm x 5mm. EUR 2.45 at Mouser.
My guess would be that 4 1N4007's would still be cheaper
Four 1N4007s costs me less than 40 cents. It’s just my preference.
Looking at the 3D rendering is a bit scary as the 2 capacitors look to be fused together. I would rather like to see a gap between them. But I presume it is ok and will work just fine.
It will. In the multi-cap cans they are actually even closer.
Nice presentation Manuel, your use of your Mac to do overlays to RUclips were quite good. Too bad you couldn't get your daughter to do the intro however but somehow I think this particular presentation was more of a filler and that you and your family are out enjoying spring days on fantasy Island.
Actually, my voice artist (a.k.a. my daughter) has already flown back to the mainland to university after the short Easter break :)
I am awaiting delivery of a special radio that I have been seeking for some time, which should arrive this week. That's why I did not want to start another restoration series :)
@@electronicsoldandnew Sorry Your daughter couldn't spend more time at home, though you save money in the long run because of the restaurant bills.
Looking forward to the next radio adventure.
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What was the value of that resistor ? You showed three 1k resistors in parallel then only 1 1k resistor ...
The three in parallel is so that you can adjust the total resistance to your exact needs. The values will depend on the circuit and it’s current draw, arrived at (normally) by experimenting
Also see: Jim Burns
WAIT! Did you just sh1t talk Tipton?? He is quite the genius isn't he? Love the way you think. I would rather have my radio work and be reliable than to have it be museum perfect.
Nope. Dave is a friend, and his genius is always appreciated 😊
@@electronicsoldandnew I rather expected that was the case. I have watched ALL of his work.
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