Maplin CW Filter - UK Vintage Radio Repair and Restoration Discussion Forum

Tannebri · 20th Nov 2013, 11:53 am

Hi All

I've been given a Maplin CW filter Kit but no documentation does anyone have a copy of the instructions as I cannot find anything on the NET.

Tannebri

Bazz4CQJ · 20th Nov 2013, 6:43 pm

Can you offer some more info about what this kit consists of? I recall Maplin producing an audio processor originally shown in use on the phones output of an Eddystone receiver, but it wasn't described or limited to use as a CW filter.

Martin G7MRV · 20th Nov 2013, 6:50 pm

If you have a maplin part number (usually two letters, two numbers then two more letters), or a date marked on the project, I can probably find the appropriate article in 'Electronics', as I have an electronic library of them

Radio Wrangler · 20th Nov 2013, 11:45 pm

I'd guess it was an audio filter as anything else would need to be specific to the intermediate frequency of a particular radio.

Is it active or passive?

A photo would help a lot.

David

Tannebri · 21st Nov 2013, 10:42 am

The kit number is LU13P I should have written that in the last post. All I have is a PCB and a bag of bits minus the IC. I suspect it is a Active band pass filter.

tannebri

AC/HL · 21st Nov 2013, 12:45 pm

It's in magazine issue 93 according to the index. I may have it somewhere, I'll check unless someone beats me to it.

Martin G7MRV · 21st Nov 2013, 5:52 pm

I have the PDF of the project from the magazine, just trying to get it to you now!

20th Nov 2013, 11:53 am	#1
Tannebri Tetrode Join Date: Jun 2013 Location: Kington Langley, Wiltshire, UK. Posts: 52	Maplin CW Filter Hi All I've been given a Maplin CW filter Kit but no documentation does anyone have a copy of the instructions as I cannot find anything on the NET. Tannebri

20th Nov 2013, 6:43 pm	#2
Bazz4CQJ Dekatron Join Date: Apr 2009 Location: Oxfordshire, UK. Posts: 4,934	Re: Maplin CW Filter Can you offer some more info about what this kit consists of? I recall Maplin producing an audio processor originally shown in use on the phones output of an Eddystone receiver, but it wasn't described or limited to use as a CW filter.

20th Nov 2013, 6:50 pm	#3
Martin G7MRV Heptode Join Date: May 2008 Location: Selby, North Yorkshire, UK. Posts: 951	Re: Maplin CW Filter If you have a maplin part number (usually two letters, two numbers then two more letters), or a date marked on the project, I can probably find the appropriate article in 'Electronics', as I have an electronic library of them __________________ I got food in ma belly and a license for ma telly My Blog - http://g7mrv.blogspot.com

20th Nov 2013, 11:45 pm	#4
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,858	Re: Maplin CW Filter I'd guess it was an audio filter as anything else would need to be specific to the intermediate frequency of a particular radio. Is it active or passive? A photo would help a lot. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

21st Nov 2013, 10:42 am	#5
Tannebri Tetrode Join Date: Jun 2013 Location: Kington Langley, Wiltshire, UK. Posts: 52	Re: Maplin CW Filter The kit number is LU13P I should have written that in the last post. All I have is a PCB and a bag of bits minus the IC. I suspect it is a Active band pass filter. tannebri

21st Nov 2013, 12:45 pm	#6
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Maplin CW Filter It's in magazine issue 93 according to the index. I may have it somewhere, I'll check unless someone beats me to it.

21st Nov 2013, 5:52 pm	#7
Martin G7MRV Heptode Join Date: May 2008 Location: Selby, North Yorkshire, UK. Posts: 951	Re: Maplin CW Filter I have the PDF of the project from the magazine, just trying to get it to you now! __________________ I got food in ma belly and a license for ma telly My Blog - http://g7mrv.blogspot.com