Hi Brian,
Looking good.
Here's a couple more ideas for you NOT to use.
1. I still think R3/R4 should be to the side of the filter cap as it gives you a more compact design.
2. Also to make the design complete, why don't you add a "power on" LED and resistor. This LED would indicate power on and the charge status of the cap. It would also help the cap discharge process. This could be located close to R3/R4. Allow people to have the LED on board or run wires to the front panel.
Looking good.
Here's a couple more ideas for you NOT to use.
1. I still think R3/R4 should be to the side of the filter cap as it gives you a more compact design.
2. Also to make the design complete, why don't you add a "power on" LED and resistor. This LED would indicate power on and the charge status of the cap. It would also help the cap discharge process. This could be located close to R3/R4. Allow people to have the LED on board or run wires to the front panel.
falcott said:25mm ??
I have not been able to find 10,000uF 50V caps smaller in diameter than 35mm! What Panasonic type are you using, and where can I find them?
Digikey - Panasonic TS series:
http://dkc3.digikey.com/PDF/T051/0875.pdf
Board now supports 30mm caps as well
grege said:Here's a couple more ideas for you NOT to use.
1. I still think R3/R4 should be to the side of the filter cap as it gives you a more compact design.
2. Also to make the design complete, why don't you add a "power on" LED and resistor. This LED would indicate power on and the charge status of the cap. It would also help the cap discharge process. This could be located close to R3/R4. Allow people to have the LED on board or run wires to the front panel.
Here is a screenshot of the board with R3/R4 on the side to allow for 30mm caps. I will look into adding the resistor for the LED. I had planned on doing this a while back, but forgot about it.
--
Brian
Attachments
Brian, i'm actually getting some of theese boards with the good grace of steenoe, but would you mind making it possible for 35mm caps? i swear to 80v caps for reasons unknown, and would like to have it my way
but how about some traces for easy implimenting some regulators as well? it should not take up much space..
but how about some traces for easy implimenting some regulators as well? it should not take up much space..
demogorgon said:Brian, i'm actually getting some of theese boards with the good grace of steenoe, but would you mind making it possible for 35mm caps? i swear to 80v caps for reasons unknown, and would like to have it my way
but how about some traces for easy implimenting some regulators as well? it should not take up much space..
I am looking into the possibility of 35mm caps. The layout currently supports 25mm and 30mm caps.
As for the regulators, Why would you need traces, just run the output of the board into a regulator, and then the output of the regulator into the amp board. I am sure you could prototype something. Regulators are not going to be used in the kit that I will be providing.
--
Brian
I reworked the layout again, and here is a version that would support 25mm, 30mm and 35mm caps (snap-in type with 10mm lead spacing and 2mm holes are provided for mounting leads):
BLUE = bottom layer, RED = top layer
I didn't add any heat-relief traces yet for the components mounted to the main planes (or beefy traces), and I am considering this now.
I am now leaning more towards making the LM3886 pcb set the same size as the LM3875 pcb set with normal rectifier boards, and offering the "snubberized" pwr supply pcb seperately, to allow for more flexability. Any comments?
--
Brian
An externally hosted image should be here but it was not working when we last tested it.
BLUE = bottom layer, RED = top layer
I didn't add any heat-relief traces yet for the components mounted to the main planes (or beefy traces), and I am considering this now.
I am now leaning more towards making the LM3886 pcb set the same size as the LM3875 pcb set with normal rectifier boards, and offering the "snubberized" pwr supply pcb seperately, to allow for more flexability. Any comments?
--
Brian
Upupa Epops said:To Brian : " You too, Snubbrutus ? "
Seems worth trying... and I have wanted to try a higher capacitance power supply.
Here is a mockup of the pcb in the actual size with 35mm caps installed on the pcb. Board width is the same as the current LM3875 boards:
--
Brian
Attachments
To Brian : Why are you using two rectifiers ? It have sense only in case, if you can use voltage regulators and have only one polarity one. With center tapped and center grounded transformer you get the same ripple effect by better efficiency. " Ringing " on both rails you can in this case dump by +/- bypasing capacitor, 'cos " ringing " periode is on both rails in opposite polarity.
BrianGT said:
I think that is a great solution, much easier for you than custom matching boards. So i guess the LM3886/LM3785 would be similar to the kits offered in the past. Which means one could buy a single snubbered supply board with the components not offered on the standard kit for an extra cost.
Snubber board really looking great!
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.