This is a 18V fixed-voltage MyVolts-branded power supply adaptor designed to meet exactly the power specification of your Soundcraft Notepad-8FX Mixer.
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AC DC 220v To 12V 5V Power Supply Adapter 3V 4.5V 5V 6V 8.5V 9V 12V 13V 1A AC DC Power Supply Charger Adapter Transformers SMPS
Aliexpress UK
Replacement power supply for SOUNDCRAFT analogue mixing consoles
eBay
AC DC 5V 12V Power Supply Adapter Universal Charger 220V To 3V 4.5V 5V 6V 8.5V 12V 13V 1A Power Adapter Supply For Led Strip
Aliexpress UK
Package included：1×Adapter+1*Power Cord（UK plug) Notice:If u need other plug(AU/US/EU)，please leave message after placing order, thanks.
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AC DC 220V to 12V Switching Power Supply Adapter AC to DC 12V 1A 2A 3A 4A 5A 6A 8A 10A Transformer Led 12 V Power Supply SMPS
Aliexpress UK
Specifications: Input: 220V 50Hz Output:AC18Vx2-1.6mA Package included：1×Adapter＋1×Power Cord Notice:*99.99% of the problem orders are due to the adapter's interface error. Even if the model you purchased is correct, you still need to check the interface carefully. ( The reason is: more and more cases of the same adapter model and multiple interfaces appear on the market ).
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AC DC 5V 6V 9V 12V 13V 15V 24V Power Adapter Supply 1A 2A 3A 5A 6A 8A Led 5V 9V 12V Power Supply Adapter 5 12 24 V Volt Led Lamp
Aliexpress UK
All in working other and tested, comes with original power supply
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AC DC 5V 6V 8V 9V 12V 13V 15V 24V Power Supply Adapter 1A 2A 3A Transformers 220V To 12V Led Strip Power Supply 5 12 24 V Volt
Aliexpress UK
Untested so not sure if it works.
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AC 110-240V DC12V Power Supply Adapter 5V 6V 9V 13V 24V 12V 1A 2A 3A Universal Power Supply Charger Adapter For LED Light Strips
Aliexpress UK
The Soundcraft Compact 4 Mixer is a fully working, compact mixer ideal for studio recording and live sound applications. With 2 mic inputs, 4 line inputs, and a maximum sampling rate of 48 kHz, this desktop mixer offers versatility and professional sound quality. The mixer comes with a power supply and features a range of input/output ports including 1/4" TRS and XLR ports. With a sleek design and weighing only 2 kg, the Soundcraft Compact 4 Mixer is a reliable and convenient choice for various audio setups.
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Power Supply Adapter AC DC 12V 3V 9V 12V 24V 36V 2A 3A 5A 10A Transformers 220V To 12V Adjustable Led Power Supply 12 24 V Volt
Aliexpress UK
eBay
AC DC 3V 5V 9V 12V 24V Power Supply Adapter 1A 2A 5A 10A Fonte Transformer 220V To 12V 24V 36V 5V Power Supply 5 12 24 Volt
Aliexpress UK