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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 18th Apr 2018, 9:29 am   #1
'LIVEWIRE?'
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Question Differences between 4Mhz Ceramic Filters?

This may be a silly question, but I've just ordered some 4Mhz 3-terminal Filters from an eBay seller to replace a suspect one in a Pioneer remote control. The ones being supplied are Brown, whereas that in the control is Blue, and marked 4.00 M J (The 'M' is in a circle ) Is there any significant difference between the outwardly similar - apart from the color - filters?
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Old 18th Apr 2018, 9:39 am   #2
Nuvistor
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Default Re: Differences between 4Mhz Ceramic Filters?

I think they are batch selected and the same colour will have the same response, of course different manufacturers may use different colours.
So in a 4 MHz filter you would use all the same colours.
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Old 18th Apr 2018, 10:45 am   #3
'LIVEWIRE?'
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Default Re: Differences between 4Mhz Ceramic Filters?

There is only one 4Mhz filter in the remote control (a Pioneer CU-VSX140, b.t.w.) so I shall await the replacement filters and see what happens. At £2 for 5, they'll hardly break the bank if incorrect, whilst a replacement control is about £150 from Donberg!!
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Old 18th Apr 2018, 11:37 am   #4
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Default Re: Differences between 4Mhz Ceramic Filters?

M for Murata most likely

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Old 18th Apr 2018, 2:15 pm   #5
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Default Re: Differences between 4Mhz Ceramic Filters?

Experience suggests that most "totally dead" problems with remotes are microscopic track breaks, often near the battery connectors.
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Old 18th Apr 2018, 9:38 pm   #6
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Default Re: Differences between 4Mhz Ceramic Filters?

Also the infra red LED sometimes has dry joints where it connects to the PCB, due to flexing I presume. That's if your remote is an infra red one of course.
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