Good morning folks,
I'm looking for reassurance that I've done the right thing or advice if I haven't!
I live in the UK with a 240v 50z electrical supply and own a NAD 3020 which I think sounds fantastic.
A common issue with the NAD 3020 is a power switch with degraded contacts and mine was no exception with the power LED often flickering for the first few minutes of operation.
To rectify this I managed to find an identical replacement. The original switch used to switch both live and neutral, but I have wired the replacement so that both sets of contacts switch the live side only to basically increase the amount of metal making contact for a more reliable connection. The neutral of the mains cable coming into the amplifier is now wired straight to one side of the transformer primary.
The original switch had two blue capacitors in parallel (one in parallel with the neutral switch throw and one in parallel with the live throw).
I read that an RC Snubber (capacitor and resistor in one package) would be a suitable replacement to better protect the switch from
arching, so I bought a Roxburgh RE1201 for this purpose and soldered it in parallel with my new switch.
My concern is having done further reading the encapsulated resistor in the RE1201 appears only to have 1/4 watt power rating according to the datasheet. Is this cause for alarm? I am confused why an item that appears to be specifically designed for this purpose might be unsuitable due to insufficient power rating.
The datasheet is available on the following product page:
https://uk.farnell.com/roxburgh/re1...=AFC-CJ-UK-8989328&gross_price=true&source=CJ
The RE1201 does not seem to get hot and has significantly improved the power on thumps.
In addition to comments on whether the resistor is up to the job, is the 0.1uf 120ohm combination okay? This seems a common value for snubbers available on the market.
Thoughts gratefully received. There are a lot of different opinions it seems around this sort of subject and the mathematical calculations seem to get quite complex, at least for me.
With thanks
Stephen
I'm looking for reassurance that I've done the right thing or advice if I haven't!
I live in the UK with a 240v 50z electrical supply and own a NAD 3020 which I think sounds fantastic.
A common issue with the NAD 3020 is a power switch with degraded contacts and mine was no exception with the power LED often flickering for the first few minutes of operation.
To rectify this I managed to find an identical replacement. The original switch used to switch both live and neutral, but I have wired the replacement so that both sets of contacts switch the live side only to basically increase the amount of metal making contact for a more reliable connection. The neutral of the mains cable coming into the amplifier is now wired straight to one side of the transformer primary.
The original switch had two blue capacitors in parallel (one in parallel with the neutral switch throw and one in parallel with the live throw).
I read that an RC Snubber (capacitor and resistor in one package) would be a suitable replacement to better protect the switch from
arching, so I bought a Roxburgh RE1201 for this purpose and soldered it in parallel with my new switch.
My concern is having done further reading the encapsulated resistor in the RE1201 appears only to have 1/4 watt power rating according to the datasheet. Is this cause for alarm? I am confused why an item that appears to be specifically designed for this purpose might be unsuitable due to insufficient power rating.
The datasheet is available on the following product page:
https://uk.farnell.com/roxburgh/re1...=AFC-CJ-UK-8989328&gross_price=true&source=CJ
The RE1201 does not seem to get hot and has significantly improved the power on thumps.
In addition to comments on whether the resistor is up to the job, is the 0.1uf 120ohm combination okay? This seems a common value for snubbers available on the market.
Thoughts gratefully received. There are a lot of different opinions it seems around this sort of subject and the mathematical calculations seem to get quite complex, at least for me.
With thanks
Stephen