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Repair and disassembly information for amplifiers in home audio systems.

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New amp and no power supply. How do I power this amp?

So I bought an Smsl A50 on eBay and it doesn't cone with the power supply.

Problem is, its darn near impossible to find 6.75 amp 24v power supply, but would rather not buy stuff if I dont need to.

Feels like I waster my money here but are there any easy solutions to modify or maybe just roll with a 6 amp supply safely vs 6.75 amp?

Beantwoord deze vraag Dit probleem heb ik ook

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Hi @dolanchomsky

Might be better to go with a 24V 7A AC/DC adapter (or even one with a slightly higher current output e.g. 8-10A if you have one) which has the correct size barrel plug connector.

The amp will only draw as much current as it needs to, at any one time. As long as the voltage supply is exactly the same, i.e. 24V DC, it will be fine.

The only way it will draw more current that could cause some damage, is if the voltage is increased beyond 24V or there's a fault in the amp.

Update (10/16/23)

Hi @dolanchomsky

It's not a case of a "smaller straw" as the maximum value of current required to power all the functions of the amp is a known amount due to the circuit design. So the amp will never draw more than this from the power source. It may even draw less depending on what components in the amp e.g. BT etc are being used or not used at the time

Most DC coax (barrel type) power plugs are usually in the following sizes and usually come with current ratings as well

  • Type A: 5.5 mm OD, 2.1 mm ID (with optional screw lock)
  • Type A: 5.5 mm OD, 2.5 mm ID (with optional screw lock)
  • Type B: 6.0 mm OD, 2.1 mm ID
  • Type B: 6.0 mm OD, 2.5 mm ID
  • Type C: 3.8 mm OD, 1.1 mm ID
  • Type D: 6.3 mm OD, 3.1 mm ID
  • Type E: 3.4 mm OD, 1.3 mm ID

The hard part is if they're a type A or a type B and you have to choose which one to fit the socket that you want to connect to

A type A or B 2.5mm ID plug will fit into a corresponding OD size Type A or B 2.1mm ID socket but it will be an intermittent connection i.e. sometimes there, sometimes not.

A Type A or B 2.1mm ID plug will not fit into a corresponding OD size Type A or B 2.5mm ID socket.

So if you're experiencing intermittent power loss it may be because you have the wrong plug for the socket

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Oh, that makes perfect sense. Smaller 'straw', so to speak, at the end can limit the current to the device.

The previous comment eases my worries about the current being exact current coming through in that case particularly, but this actually fascinates me. I was convinced I would have needed to modify components as is required for example in a TP-4056 battery charger module but that's a little different I guess with batteries. Both would be similar, presumably, in that the system that allows this current management (over-current protection) is exactly what i believe makes this possible.

Thanks for your two cents! I have gone down the "finding the size barrel connector you need" road before and really worried about not only it not fitting but also destroying my device, I'm sure its still smart to worry about in the case of batteries perhaps, bland here as well, but it seems to be difficult to nail down what precise size you need for the job.

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DolanChomsky zal eeuwig dankbaar zijn.
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