Hi,
I'm building an amp that will use a Hypex SMPS1200A400 power supply (DIYclassd.com), and I want to add a soft start module, also from Hypex (DIYclassd.com) for in-rush current protection as well as standby functionality.
The soft-start module will make it relatively straight-forward to add a push-button to toggle the amp between standby and on. I would also like to add a 12V trigger, but Hypex told me that their soft-start module doesn't support that feature.
Does anyone here know of a way to rig something up so a 12V trigger could still work with this soft-start module? I'd prefer to use this module as with it the power supply would only draw 1.2W in standby mode, whereas without it, it will draw 9W in standby mode.
And otherwise, is a soft-start module really necessary? I'm pretty new to working with electronics and would like to be able to put this amp in standby mode or switch it on with a button on the front of my case, and use the 12V trigger to turn it on/standby from other components in my system.
Would appreciate any ideas 🙂
I'm building an amp that will use a Hypex SMPS1200A400 power supply (DIYclassd.com), and I want to add a soft start module, also from Hypex (DIYclassd.com) for in-rush current protection as well as standby functionality.
The soft-start module will make it relatively straight-forward to add a push-button to toggle the amp between standby and on. I would also like to add a 12V trigger, but Hypex told me that their soft-start module doesn't support that feature.
Does anyone here know of a way to rig something up so a 12V trigger could still work with this soft-start module? I'd prefer to use this module as with it the power supply would only draw 1.2W in standby mode, whereas without it, it will draw 9W in standby mode.
And otherwise, is a soft-start module really necessary? I'm pretty new to working with electronics and would like to be able to put this amp in standby mode or switch it on with a button on the front of my case, and use the 12V trigger to turn it on/standby from other components in my system.
Would appreciate any ideas 🙂
If the PSU is mediocrely designed, it must include in their own circuitry, a soft start or the kind inside it. Most use a NTC, others a resistor shunted by a relay, a thyristor or TRIAC. I saw a Siemens unit that uses an IGBT in the negative rail too. So, why add another soft start externally? And why trigger it externally, if its function is only very few thousands of millisecond when charging bulk capacitors? Sorry, I don't understand your criteria.
This soft start module in combination with the power supply (both manufactured by Hypex) will also provide lower standby power usage (1.2W vs 9W without it).
You don't need the soft start module - it is intended for transformer power supplies.
Read the power supply data sheet.
The power supply needs between 3.3 & 12V to put in standby.
Also read the datasheet for how to connect the amplifier standby for pop-free startup.
I am surprised Hypex do not provide the necessary low current standby power output within this unit. I suggest you re-purpose an old phone charger (5V).
Note - the Hypex data sheet does not actually state the standby power consumption. 9W is the no load (supply enabled) consumption.
Read the power supply data sheet.
The power supply needs between 3.3 & 12V to put in standby.
Also read the datasheet for how to connect the amplifier standby for pop-free startup.
I am surprised Hypex do not provide the necessary low current standby power output within this unit. I suggest you re-purpose an old phone charger (5V).
Note - the Hypex data sheet does not actually state the standby power consumption. 9W is the no load (supply enabled) consumption.
Thanks.
One other question, for those IEC sockets that go to mains and can have a fuse, what should the fuse rating be?
The unit has a fuse soldered to the board. It is rated at 12A, slow blow.
So a fused IEC socket is not necessary.
In the UK this supply would require a 13A fuse in the mains plug.
I don't know what fuse would be used in the USA.
Take care and read the data sheet, particularly safety related and don't forget to check the jumper setting for your mains supply voltage.
So a fused IEC socket is not necessary.
In the UK this supply would require a 13A fuse in the mains plug.
I don't know what fuse would be used in the USA.
Take care and read the data sheet, particularly safety related and don't forget to check the jumper setting for your mains supply voltage.