Maplin 160W (225W) bipolar amplifier design - diyAudio
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Old 19th February 2008, 05:16 PM   #1
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Default Maplin 160W (225W) bipolar amplifier design

Does any one have a copy of the parts list for this design (as published in old copies of the maplin catalogue and used in their diy disco consule many years ago). I have a schematic and a number of broken modules. Any help welcomed
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Old 20th February 2008, 10:35 PM   #2
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Hi bluevanman63

Think this was the one with two pairs 2N3055/MJ2955 in the output?

If so the one I'm thinking of had BFY50's and suchlike. BUt these were never 80V transistors, had to use Vcer spec. which seemed dubious.

You could probably use 2N3019 for all NPN's and 2N4033's as PNP's for input & driver in TO-39 cans or with a bit of persuasion BD139/BD140's for all small signal devices.

cheers
John
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Old 29th February 2008, 07:43 PM   #3
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Default Maplin 160W amplifier

I have a copy (scanned) of the page from a 1992 catalogue, it includes the circuit diagram, parts list and set up details. Happy to send you a copy.
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Old 29th February 2008, 08:33 PM   #4
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Default may i have

a copy also .....

always interested how amplifiers worked in the past .....

especially if they are made with simple parts like 2n3055....

thanks
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Old 1st March 2008, 12:27 PM   #5
latala is offline latala  United Kingdom
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I also have some maplin modules and would appreciate a copy if possible
ypu can e-mail it to me if poss
regards Trev
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Old 2nd March 2008, 01:53 AM   #6
Vivek is offline Vivek  India
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Hi, I would like to have a copy of that too.

Thanks and regards,
Vivek.
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Old 4th March 2008, 12:34 PM   #7
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Default any news

any news about this circuit ????

thanks
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Old 1st December 2008, 05:13 AM   #8
DaveCl is offline DaveCl  New Zealand
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Default Maplin 160W (225W)

At last, someone who has the same AMP. I build mine back in 1995 i have used it for my mobile disco since. it's been a fantastic Amp until now. The bias circuit has gone a bit off track and as the amp warm up the bias reduces and turns off the transistors. cut a long story short while in a hurrt trying to fix it pick up the speaker leads and pluged it in. Puzzled by the no output turned it up only to find out that i had connected both channles together and burnt out two resistors on the board. Do you have any info on the amp such as a schematic and parts list. This has been such a good amp i really want to get it fixed. PLease help
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Old 1st December 2008, 04:56 PM   #9
Mooly is offline Mooly  United Kingdom
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I remember these It was a very basic circuit, should be easy to draw from a populated PCB.
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Old 15th December 2008, 02:26 PM   #10
jacks76 is offline jacks76  Indonesia
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Why not post to the forum ?
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