Unless the two adaptors are identical it might be good to put a diode in series too. Under normal conditions this will just drop 0.7V. On switch-off or some fault conditions it may stop one supply from driving current backwards through the other one, which could cause damage.
Every laptop adapter I have used has had the barrel (usually "minus") connected to earth through the ground pin on the AC plug. This would make it impossible to easily series them.
Most likely the secondary of the SMPS is indeed isolated, and you could just not connect the ground pin, but it's one of those "if you have to ask, you shouldn't try" kind of things.
So. The short answer is "No."
Most likely the secondary of the SMPS is indeed isolated, and you could just not connect the ground pin, but it's one of those "if you have to ask, you shouldn't try" kind of things.
So. The short answer is "No."
Power Supply Question
Thanks for the previous answers.
I've located two 24 Vdc power supplies which are likely to support a series connection. These are inexpensive SMPS, rated at about 2A each, and are a open frame rather than wall wart style case with barrier strips instead of barrel connectors.
However, they are described as "constant voltage, LED power supply". How is that different than a "DC power supply"?
I do need constant voltage rather than constant current. Application is for a small Class A headphone amp.
Also, for Class A, current load presented to the power supply should be constant, therefore step load response should not be a major concern, correct?
Thanks and regards,
Rob
Thanks for the previous answers.
I've located two 24 Vdc power supplies which are likely to support a series connection. These are inexpensive SMPS, rated at about 2A each, and are a open frame rather than wall wart style case with barrier strips instead of barrel connectors.
However, they are described as "constant voltage, LED power supply". How is that different than a "DC power supply"?
I do need constant voltage rather than constant current. Application is for a small Class A headphone amp.
Also, for Class A, current load presented to the power supply should be constant, therefore step load response should not be a major concern, correct?
Thanks and regards,
Rob
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