Secondary PSU for front end
As for using a front end higher power supply voltage it has the following advantages:
1) increase max amplifier output power allowing only output stage losses
2) isolate front end voltage fluctuations caused by output stage.
3) clipping is caused by output stage only and not front end
The disadvantages are:
1) more complexity for routing secondary PSU wiring to minimize noise.
2) extra boards and space required in chassis
I have used secondary PSU for front end in several amps such as Goldmund Telos clone, VSSA-FAB, SKA-150GB....
My actual FSSA-1 and FSSA-2 amps do not have secondary PSU.
If I may suggest one can plan for space provisions in chassis for secondary PSUs for possible upgrade...😉
Fab
As for using a front end higher power supply voltage it has the following advantages:
1) increase max amplifier output power allowing only output stage losses
2) isolate front end voltage fluctuations caused by output stage.
3) clipping is caused by output stage only and not front end
The disadvantages are:
1) more complexity for routing secondary PSU wiring to minimize noise.
2) extra boards and space required in chassis
I have used secondary PSU for front end in several amps such as Goldmund Telos clone, VSSA-FAB, SKA-150GB....
My actual FSSA-1 and FSSA-2 amps do not have secondary PSU.
If I may suggest one can plan for space provisions in chassis for secondary PSUs for possible upgrade...😉
Fab
That’s what I’d use (I’ve already used xrk’s speaker protection) another option is the Holton Audio soft start and speaker protection board or the NeuroChrome Intelligent soft start. I have no experience with either, but like both of their concepts and ability to add 12v triggers.
Thanks to both for replying
It is all probably good and well but quite expensive if you add it up... Ok, by far not as expensive as my speakers but I have seen other options for far less, inclusive ready built by audiophonics etc.... any reason for such price differences?
Any affordable option?
I would rather spend the money in the PS - all I want is a good protection, high reliability and low output resistance, the rest is fine for my engineer side but not really needed in my case, basic working tech would do the job...
It is all probably good and well but quite expensive if you add it up... Ok, by far not as expensive as my speakers but I have seen other options for far less, inclusive ready built by audiophonics etc.... any reason for such price differences?
Any affordable option?
I would rather spend the money in the PS - all I want is a good protection, high reliability and low output resistance, the rest is fine for my engineer side but not really needed in my case, basic working tech would do the job...
Yep Fab, on it, hence me asking if the modules (Softstart and DC protection) were also worth considering to purchase all in one go
I too find that the PCB's for softstart and DC protection, that are being offered, are expensive. Add exchange rate and freight and the boards end up being US$50 - $100 each😱 If you're building multiply amps this is a large cost.
For years I have used the softstart kits with thermistors from Ebay, without any problem. They now come with remote control and a temperature control switch.
For DC SSR protection you might want to look at this link:
SSR for speaker protection?
For years I have used the softstart kits with thermistors from Ebay, without any problem. They now come with remote control and a temperature control switch.
For DC SSR protection you might want to look at this link:
SSR for speaker protection?
Soft start u can use 47 ohm 20w parallel with omron timer relay.. I like it especially charging huge cap bank and with option to delay the relay up to 60s
S4G1 Dual OMRON Relay 7812+UPC1237 Speaker Protection Board fr HIFI DIY AC 12-24 192090102396 | eBay
This is decent.. I like upc1237.. It's fast, with omron relay the quality is decent
This is decent.. I like upc1237.. It's fast, with omron relay the quality is decent
Lolllll... Bacon on top..
.. It's just warm charging 390,000uf no issue. 30s delay
If u want super.. Leave them on 24x7... Install a 3 way mcb after the cap reservoir. Especially if u have a seperate supply going to the front end leave them on.
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Everyone has their own preference/ solution.
Instead of a resistor I use two thermistors in series for 240Vac mains, just in case the relay does not operate.
Instead of a resistor I use two thermistors in series for 240Vac mains, just in case the relay does not operate.
Yup that's best in series...true limiting of current.
But so difficult to find CL60 locally..
Anyway extra relay is good.. Sounds better
But so difficult to find CL60 locally..
Anyway extra relay is good.. Sounds better
xrk971 uses NTC8D-20 from AliExpress. Much cheaper than CL60.
Edit I use a relay to bypass the thermistors.
Edit I use a relay to bypass the thermistors.
