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What is this (broken) component in the mains side of an amplifier power supply PCB?

The manufacturer logo is "Matsushita". It is one of their "V" series varistors. Looking trough their product catalogue, only the "ERZV07D431" can be a match, with marking ...
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11 votes

What is this (broken) component in the mains side of an amplifier power supply PCB?

You are looking at a varistor. It's an overvoltage protection for your circuit. https://en.wikipedia.org/wiki/Varistor To identify a replacement, you should choose one that is around 20V above your ...
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1 vote

What is this (broken) component in the mains side of an amplifier power supply PCB?

It was a varistor. Choose one rated for your voltage and similar in diameter to the blown component.
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1 vote

Glass cartridge fuses, what does the "P" suffix mean?

Found it..."P" means lead-free.
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1 vote
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Identify component marked β908 ER

It's SMBJ170CA, a bidirectional TVS (Transient Voltage Suppressor) from Bourns. Check the table on the 2nd page. NOTE: The package of the device you photographed seems like SMB or SMC, but the package ...
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2 votes

Eagle footprint - create a pin row

Arduino's pin header are fairly common (2.54 mm pitch pin header). I think there is already the footprint you're looking for in EAGLE (example MA04-1 in the con-lstb library). You may need two of ...
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1 vote
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Identifying a resettable fuse marked N⩙

Looks a lot like a Littelfuse nanoSMD PolySwitch. Specifically the model nanoSMDC016F, based on this datasheet.
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3 votes
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What is a field effect rectifier diode (FERD) and what is it used for?

Summary Apparently, the FERD is a technology all its own, a higher-priced higher-quality (lower forward voltage, lower leakage), or as one later-quoted source says, "achieves the best in class VF/...
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1 vote

Identifying a resettable fuse marked N⩙

Depending on the component manufacturer, this could be any value from 100mA to 5A (or more). My SMD fuses marked with N and that sign are rated at 2.0 Amperes. Yours might be different. Try searching ...
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1 vote

Could someone help me identify this component?

You can find them here: it’s indeed a fuse.. (0805 6V 0.35A, 250mA and resettable) https://m.nl.aliexpress.com/item/32844142452.html?gatewayAdapt=Pc2Msite
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