After the first group buy of the soft switch circuit, I continued to get emails from people interested in the kit. I've made a version 2 which includes the following improvements:
1. Replace the hard-to-obtain MAX6816 (debounce IC) with a CD4013.
2. Added a high current relay to switch up to 15A AC.
3. Added jumpers to make one board work with 115VAC and 230VAC.
4. Added an NTC thermistor for in-rush current limiting. The layout supports the popular CL-60 or larger CL-101 part.
5. Added a fuse (15A max) for the switched output.
6. Added an output for an optional current-limiting board.
You can find more info and pictures on my website: http://www.robcheng.com
Click on AUDIO -> ELECTRONICS -> SOFT SWITCH V2
Here is preliminary pricing:
$55 shipped (U.S.) includes everything.
$40 shipped (U.S.) minus the switch.
$15 shipped (U.S.) for PCB only.
International: add ~ $5-$10 depending on location.
The prices are higher than the previous GB because I'm including the transformer and high-current relay.
Please post or email if interested or if you have any comments, suggestions, etc. As interest grows I'll create a Wiki page.
1. Replace the hard-to-obtain MAX6816 (debounce IC) with a CD4013.
2. Added a high current relay to switch up to 15A AC.
3. Added jumpers to make one board work with 115VAC and 230VAC.
4. Added an NTC thermistor for in-rush current limiting. The layout supports the popular CL-60 or larger CL-101 part.
5. Added a fuse (15A max) for the switched output.
6. Added an output for an optional current-limiting board.
You can find more info and pictures on my website: http://www.robcheng.com
Click on AUDIO -> ELECTRONICS -> SOFT SWITCH V2
Here is preliminary pricing:
$55 shipped (U.S.) includes everything.
$40 shipped (U.S.) minus the switch.
$15 shipped (U.S.) for PCB only.
International: add ~ $5-$10 depending on location.
The prices are higher than the previous GB because I'm including the transformer and high-current relay.
Please post or email if interested or if you have any comments, suggestions, etc. As interest grows I'll create a Wiki page.
Thought of combining the soft start and soft switch boards together in one circuit?
That might be popular.
-David
That might be popular.
-David
dw8083 said:
Part of the problem with that idea is size. I don't doubt that there are folks who would want it all in one board, however I think some won't have room for a "large" board and not everyone needs the current limiting resistors. In smaller power amps the CL60 will work fine.
Got you down for 2 to 4.
--Rob
Hi Robert,
You might consider adding a GB close date and and estimated ship date to the wiki page to help set expectations.
One other idea. What if the soft start board was combined with soft switch, but seperated with a scoring line. There could be jumper pads from one board to the other. The boards could be easily split if space is an issue, or the soft start is not wanted. Depending upon the PCB vendor, there might not be any additional cost for taking this approach. The soft switch parts could be included as planned, and the soft start parts are up to the buyer.
Just a thought,
-David
You might consider adding a GB close date and and estimated ship date to the wiki page to help set expectations.
One other idea. What if the soft start board was combined with soft switch, but seperated with a scoring line. There could be jumper pads from one board to the other. The boards could be easily split if space is an issue, or the soft start is not wanted. Depending upon the PCB vendor, there might not be any additional cost for taking this approach. The soft switch parts could be included as planned, and the soft start parts are up to the buyer.
Just a thought,
-David
G'Day Eh !
Hello fellow DIY'ers.
This is exactly what I was in the process of designing!
I would love to get on the list for this GB.
How do I go about signing up ?
I'd like Qty 1 Soft Switch (Full kit)
and Qty 8 of the Soft Start.
Thanks.
Hello fellow DIY'ers.
This is exactly what I was in the process of designing!
I would love to get on the list for this GB.
How do I go about signing up ?
I'd like Qty 1 Soft Switch (Full kit)
and Qty 8 of the Soft Start.
Thanks.
I have updated the pricing on the Wiki page and I'm now accepting payments. I plan to start ordering parts on Aug 22, so this group buy will close on Aug 21. I will be ordering a limited amount of extra boards for those of you who procrastinate.
If you haven't yet, please send me an email directly so I can contact you directly if needed. Also check your info on the Wiki page and update any blanks (such as location).
If you haven't yet, please send me an email directly so I can contact you directly if needed. Also check your info on the Wiki page and update any blanks (such as location).
bg40403 said:
No it will not. The CD4013 is a 14-pin dual flip-flop while the MAX6816 is a 4-pin dedicated device for debouncing applications.
Due to an unplanned work trip out of the country for 2 weeks, I will be extending the group buy until the end of August. If you haven't paid yet, please do so. Payment instructions are on the wiki page.
Hey guys, only 13 days 'til this group buy closes.
Time to cough up the dough so it won't be cancelled -- I want mine! 😀
Time to cough up the dough so it won't be cancelled -- I want mine! 😀
I also want one. But I'm waiting for a reply regarding the shipment costs to the Netherlands. When I know the exact total price I can make payment.
Hi,
I may be interested in a pair for my monoblock tube amps. Just a couple of questions.
I am on the wrong side of my mid forties
and find myself having a harder time working with the small stuff. I have never worked with the really small parts so just how hard is it to solder SMT components?
Also, can the "optional soft start kit" handle B+ of 450 to 500 volts at a 100 to 150 ma?
Regards,
ck
I may be interested in a pair for my monoblock tube amps. Just a couple of questions.
I am on the wrong side of my mid forties
and find myself having a harder time working with the small stuff. I have never worked with the really small parts so just how hard is it to solder SMT components? Also, can the "optional soft start kit" handle B+ of 450 to 500 volts at a 100 to 150 ma?
Regards,
ck
ck -
You may have a few years on me, but I find one of these to be essential for most work: http://store.devinemedical.us/luxfluormagl.html
You may have a few years on me, but I find one of these to be essential for most work: http://store.devinemedical.us/luxfluormagl.html
for a few years now. Ciscokid said:
The relay isn't rated for that high a voltage. I suggest if you want to use this circuit with a tube amp that you place the current limiting circuit on the primary side of the transformer.
This is a reminder that I would like to close the group buy very soon.
There are still some folks who have expressed interest who have not paid:
DaveN
David (DW8083)
GeWa
Argofanatic
Chipco3434
Coulomb
jonk
dr.Strangelove3
Cobra2
mike2
Please check the Wiki page to verify your quantities, calculate amount due, and payment instructions.
Thanks.
There are still some folks who have expressed interest who have not paid:
DaveN
David (DW8083)
GeWa
Argofanatic
Chipco3434
Coulomb
jonk
dr.Strangelove3
Cobra2
mike2
Please check the Wiki page to verify your quantities, calculate amount due, and payment instructions.
Thanks.