This is a great series! You are covering a lot of useful topics, and, something that sets you apart from many others, you have tons of real experience so your choices and opinions really help bridge the gap from textbook to practical application. One thing I'm confused about is why the rectifier diodes need to have a voltage rating so much higher than the capacitor? The diodes are on the secondary side of the transformer so why do they need to be higher than the secondary voltage plus a safety margin? Will the diodes be see higher voltage than the capacitor?
Paul Nichols I appreciate your support! It’s a double edge sword - I do have a lot of experience, so I can wing it and do pretty well - and I’m actually, usually, on top of it. And here’s the big But, you caught me on a simple mistake - and I’m so happy that you did! I often do not get the reviews that I should - probably because of my success, but i made s blunder, and you great insight caught it. The bridge, in this case is on the secondary of a low voltage output - something I haven’t done in awhile. My mistake - the voltage only needs to be around 100V for the diodes! Thank you sir!
The clipping is exactly what I thought it's because of the center tap that you're using, it would be different when you use the full winding, thanks for sharing this info. Now it's making sense to me when using the center tap, I thought the center tap wasn't able to put out a positive voltage and it didn't make sense to me before watching your video series about this.
I’m glad you’re here. This next video will go over the math, quickly, and demonstrate how adding capacitors looks, and what you need for voltage ripple and also for load transients.
I do really like how you did frame the video today, all information, easily visible. And again I think that I learned a lot as I do in everyone of your video's! :-) Am I right in understanding that the VA rating is only true at the main site, that 250VA is what the transformer max can handle but not what you get out on the secondary winding's, due to power loss as flux, resistance, heat and so on?
Fried Mule Thank you for the great feedback! You have it right - and I’m glad you ask, so now I see how I need to pull things together now that we’ve made it this far in the series - so that I can draw those conclusions for others. I really appreciate your input - I know that has helped this channel grow!
Thanks for the great question! Yes, the reservoir caps are often divided with an L so you get the C (1/2 the reservoir) then L (or R) and then C (the other 1/2 the reservoir). But I think you can put the bulk of the reservoir first then the L then say 10-25% the reservoir after. Does that make sense?
@@KissAnalog oh ok i have it backwards i think.. i was thinking large caps input produce bigger and longer ripple. Tube preamp now has 100uf, 1000R, 470uf, 1000uf, 470uf. And still has noise. Might try an rc snub at the secondary. Not an EE and newbie, but the slight noise sounds like muffled switching noise.
Can you give some more details on that DC load? Does it have sense input terminals? I imagine that at 100W+ loads you're dropping some voltage in the leads.
Hi Eddie, I have a switching power supplyt made for amatuer radios. I am reluctant to use it prefer linear. With my new scope, I checked the output with no load. The waveform is at the following link. What do you think? www.dropbox.com/s/s56ddfkn576qjm6/Powerwerx.png?dl=0 Is there really a 253 hz 1.22 volt ripple/spike? I might be miss-interpreting X1&2, Y1&2, and Delta Y. If so, I am not using it with a receiver designed to sense microvolts. Brad
Hi Brad - great question!! Does that waveform repeat at some interval? If so what is the switching frequency? Also, can you capture a waveform with a load? Some switchers are actually noisier without a load. That is a very interesting ripple - not what I’d expect with the dampened ringing following the spike...
Hi Eddie, I forgot to add a load.. Haha, who else has done that before? Here is the scope picture under load. Much better but some fuzziness and frequency top right. www.dropbox.com/s/lspfjt8fiq77qe9/SDS00005.png?dl=0
LOL - I probably should be kicking back with a cold one;) But no, just working too many hours then coming home and working on videos which takes a lot of time. So late nights and early mornings;)
Me too;) I watch older videos and it makes me want to redo them! I’ll be updating that content very soon on my Class A Amplifier project as I do the power supply. I appreciate your comment or I might have not gone back to watch that video before doing the one for the amp. Now I hope to make that much better. I also think that I try too hard to shorten the videos while editing by taking out too much - then it ruins the cadence and content. Thanks- please keep providing feedback!
This is a great series! You are covering a lot of useful topics, and, something that sets you apart from many others, you have tons of real experience so your choices and opinions really help bridge the gap from textbook to practical application.
One thing I'm confused about is why the rectifier diodes need to have a voltage rating so much higher than the capacitor? The diodes are on the secondary side of the transformer so why do they need to be higher than the secondary voltage plus a safety margin? Will the diodes be see higher voltage than the capacitor?
Paul Nichols I appreciate your support! It’s a double edge sword - I do have a lot of experience, so I can wing it and do pretty well - and I’m actually, usually, on top of it. And here’s the big But, you caught me on a simple mistake - and I’m so happy that you did! I often do not get the reviews that I should - probably because of my success, but i made s blunder, and you great insight caught it. The bridge, in this case is on the secondary of a low voltage output - something I haven’t done in awhile. My mistake - the voltage only needs to be around 100V for the diodes! Thank you sir!
The clipping is exactly what I thought it's because of the center tap that you're using, it would be different when you use the full winding, thanks for sharing this info. Now it's making sense to me when using the center tap, I thought the center tap wasn't able to put out a positive voltage and it didn't make sense to me before watching your video series about this.
Thanks for the great feedback Ricardo!! Check out the latest with the Class A amp project;)
@@KissAnalog already watched your latest videos, equally interesting stuff.
Informative video on capacitor.. Thank you...
Debi Hansen Thank you - I appreciate you!
It will be interesting to see what happens when you add the second capacitor in parallel. This power stage is really coming together now.
I’m glad you’re here. This next video will go over the math, quickly, and demonstrate how adding capacitors looks, and what you need for voltage ripple and also for load transients.
Excellent, can't wait - the other things you mention below in comment replies, I'm also really interested in.@@KissAnalog
I do really like how you did frame the video today, all information, easily visible. And again I think that I learned a lot as I do in everyone of your video's! :-)
Am I right in understanding that the VA rating is only true at the main site, that 250VA is what the transformer max can handle but not what you get out on the secondary winding's, due to power loss as flux, resistance, heat and so on?
Fried Mule Thank you for the great feedback! You have it right - and I’m glad you ask, so now I see how I need to pull things together now that we’ve made it this far in the series - so that I can draw those conclusions for others. I really appreciate your input - I know that has helped this channel grow!
@@KissAnalog Thanks a lot!! I am glad if I can give a bit back, because what you give me in knowledge and entertainment are eminence!!
Fried Mule You are welcome - I’m fortunate to have you on the team!
for a CLC filter, would you consider the reservior (1st) cap part of the signal chain?
Thanks for the great question! Yes, the reservoir caps are often divided with an L so you get the C (1/2 the reservoir) then L (or R) and then C (the other 1/2 the reservoir). But I think you can put the bulk of the reservoir first then the L then say 10-25% the reservoir after. Does that make sense?
@@KissAnalog oh ok i have it backwards i think.. i was thinking large caps input produce bigger and longer ripple. Tube preamp now has 100uf, 1000R, 470uf, 1000uf, 470uf. And still has noise. Might try an rc snub at the secondary. Not an EE and newbie, but the slight noise sounds like muffled switching noise.
Any plans on valley fill circuit?
That’s a great idea for a video! Thanks for that!
@@KissAnalog Cannot wait for your video :D
Can you give some more details on that DC load? Does it have sense input terminals? I imagine that at 100W+ loads you're dropping some voltage in the leads.
Supercilious Dude That’s great insight! Voltage drops are an important detail. My next video in this series I’ll itemize each power loss.
@@KissAnalog Cool. I look forward to it. Can you also do a review of the DC load? Keep up the awesome videos man!
NOT SURE I FOLLOWED YOU COMPARING THE OUTPUT VOLTAGE DC AFTER THE CAPACITOR V.S RIPPLE VOLTAGE AND,THE PERCENTAGE RIPPLE YOU GOT.
Thanks for the feedback!! I’ll try to explain that better in the next one!
Hi Eddie, I have a switching power supplyt made for amatuer radios. I am reluctant to use it prefer linear. With my new scope, I checked the output with no load. The waveform is at the following link. What do you think? www.dropbox.com/s/s56ddfkn576qjm6/Powerwerx.png?dl=0
Is there really a 253 hz 1.22 volt ripple/spike? I might be miss-interpreting X1&2, Y1&2, and Delta Y. If so, I am not using it with a receiver designed to sense microvolts.
Brad
Hi Brad - great question!! Does that waveform repeat at some interval? If so what is the switching frequency? Also, can you capture a waveform with a load? Some switchers are actually noisier without a load. That is a very interesting ripple - not what I’d expect with the dampened ringing following the spike...
Hi Eddie,
I forgot to add a load.. Haha, who else has done that before? Here is the scope picture under load. Much better but some fuzziness and frequency top right. www.dropbox.com/s/lspfjt8fiq77qe9/SDS00005.png?dl=0
Lol is this guy drunk?
LOL - I probably should be kicking back with a cold one;) But no, just working too many hours then coming home and working on videos which takes a lot of time. So late nights and early mornings;)
@@KissAnalog sorry i just found it very erratic to follow ...
Me too;) I watch older videos and it makes me want to redo them! I’ll be updating that content very soon on my Class A Amplifier project as I do the power supply. I appreciate your comment or I might have not gone back to watch that video before doing the one for the amp. Now I hope to make that much better. I also think that I try too hard to shorten the videos while editing by taking out too much - then it ruins the cadence and content.
Thanks- please keep providing feedback!