i have a harmer+simmons SM600 output specs of 54.5Vdc and 12Adc which needs to be converted to +25Vdc,0,-25Vdc for an audio amp use. The product description pdf below says that it is a smpr/smps unit.
Can this be done? this unit was used in a batt recharging sm rectifier setup before. thks for any help.
Can this be done? this unit was used in a batt recharging sm rectifier setup before. thks for any help.
have another unit which now makes it 2 but still figuring out how the combo can give +25V,0,-25V.
can someone help? or is it better of trying a single rail amp for the build?
can someone help? or is it better of trying a single rail amp for the build?
but weren't the smps rated better than the std transfo/bridge typed ps?
have seen some examples were smps used as an upgrade.
have seen some examples were smps used as an upgrade.
Used to be an SMPS designer. These products are for telecoms battery charging. Changing the voltage so radically is strictly possible though without intimate knowledge of the circuit design and the magnertics its fraught with traps and complex. Coverting a single output SMPS to a dual output I would suggest is an non starter. Overall I would say dont bother. regards A Streeter
ok thks for the input Adrian. i have gone the other route of changing the audio cct to suit a single rail supply of that of the sm600. would this smps be suitable enough for the audio ccts? ie harmonics etc? any additional interface needed ie between the smps and the audio cct?
thks again.
thks again.
depends what you mean by suitable. Cant coment on this SMPS in particular but inevitably it will have three components of 'noise' on the output, an element of line ripple (100Hz in UK) often very small as its well rejected by the closed loop, an element of the SMPS switching frequency ripple (could be of order of dozens on mV) and other RF aberations that can be quite large due to switching noise. The latter two are always well above audio range so theoretically not a problem in audio but life isnt always like that. Given that these are designed for charging telecoms batteries they may be quite noisey though there are standards in the telecoms world that are quite aggressive to minimse noise in the audio band (e.g. phsometirc weighted noise) and H&S are reputable company. All in all I would say give it a go, it may work well but if I was to do an SMPS design (as I may do soon) I would build from scratch and design it for very low noise e.g. a resonant front end converter followed by mag amp post regulators for adjustment range on the outputs independently. StreeterA
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