Hi all here 🙂
First off, hope all enjoying the hollyday's?
Well, i am in for making a softstart circuit, but was thinking about using 5pcs. resistors of 10ohm/10watt in series....
Anybody see problems with that (making my own PCB, so layout no problem)
RG; Jesper.
First off, hope all enjoying the hollyday's?
Well, i am in for making a softstart circuit, but was thinking about using 5pcs. resistors of 10ohm/10watt in series....
Anybody see problems with that (making my own PCB, so layout no problem)
RG; Jesper.
perfect for limiting the first few starting pulses.
Your 5off 10r resistors give 50r on 230Vac supply.
That theoretically limits the worst ac current to around 4.6Aac.
Use a fuse around 2.3A, i.e T2.5A
That is good for a 500VA TO 600VA toroid transformer.
Your 5off 10r resistors give 50r on 230Vac supply.
That theoretically limits the worst ac current to around 4.6Aac.
Use a fuse around 2.3A, i.e T2.5A
That is good for a 500VA TO 600VA toroid transformer.
Does "stock" equate to no resistance, or to a single CL60, or something else?
Two series connected CL60 will give a cold resistance of ~20r @ 25°C, maybe a bit more for 20°C
That is a lot less than 50r.
CL60 and two CL60 seem to work well on 110/120Vac mains supplies.
They don't have a high enough resistance for effective current limiting on 220/240Vac Mains supplies.
i use Dale 50watt 10 ohm power resistor.....my traffo is an EI rated for 1500VA....
An externally hosted image should be here but it was not working when we last tested it.
Given you are going to build one from scratch I would recommend reading this thread and using a proper NTC for the job (perhaps an Ametherm 40 Ohms). You can use my Spice models also - linked to in that thread. I even have spare PCBs if you are interested. All at your own risk etc etc as it is a mains voltage project.
This may have been asked here before, but unfortunately I don't have time to plough through the intire thread at the moment.
In the store it's mentioned that you can buy the soft-start/speaker protection combo and that it's a set of two boards. Is that a set of two pcb's *each*? E.G.: two soft-start boards AND two protection boards?
Thanks!
James.
In the store it's mentioned that you can buy the soft-start/speaker protection combo and that it's a set of two boards. Is that a set of two pcb's *each*? E.G.: two soft-start boards AND two protection boards?
Thanks!
James.
I've been looking for it in this thread, but can't find it. Am I looking with my a**, or has it been moved elsewhere? Where can I find it?
Thanks.
what mains voltage are you using? the boards themselves are easy to build and commission...are you getting the boards from the diyaudio store?
scheme...the value of C2 depends on your line voltage..
scheme...the value of C2 depends on your line voltage..
An externally hosted image should be here but it was not working when we last tested it.
AJT, Thanks!
I'm using 220V-240V mains. Will have to measure to get the exact voltage.
When the boards will be available again, I plan to obtain them from the DIYaudio store. Along with the speaker protection and Honey Badger boards - all in one buy to save on shipping costs.
Is there a build manual, like there is one for the Honey Badger amp? I would like some info on building, setting-up and checking my work.
Thanks again!
I'm using 220V-240V mains. Will have to measure to get the exact voltage.
When the boards will be available again, I plan to obtain them from the DIYaudio store. Along with the speaker protection and Honey Badger boards - all in one buy to save on shipping costs.
Is there a build manual, like there is one for the Honey Badger amp? I would like some info on building, setting-up and checking my work.
Thanks again!
i am also looking for it, but the schematics is enough for me, when you have gathered all parts and the relay, there is data posted above as to size of C2 to use...
my line voltage is around 230 volts, so i will breadboard this and come up with a minimum value of C2 that will work even if the line dips to 200 volts ac...
i am also building a honey badger amp, my second build..
my line voltage is around 230 volts, so i will breadboard this and come up with a minimum value of C2 that will work even if the line dips to 200 volts ac...
i am also building a honey badger amp, my second build..
in a way, yes, since bigger currents makes facter charging of C3
delay is due to the sum of parts C3, and the dc resistance of the relay you used...
C2 is a current limiter, the design did not use a small traffo,
so a capacitor was used instead....you can choose its value to suit requirements...
i have a variac so i can simulate actual line conditions....
delay is due to the sum of parts C3, and the dc resistance of the relay you used...
C2 is a current limiter, the design did not use a small traffo,
so a capacitor was used instead....you can choose its value to suit requirements...
i have a variac so i can simulate actual line conditions....
How can I implement a momentary switch and remote turn on function with this board? Keep in mind I am just a moron.
You will need a whole setup specific to making the switch work. I believe AMB.org has something like that.
Then just install the soft-start downstream of the switch, as normal.
Then just install the soft-start downstream of the switch, as normal.