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Old 10th January 2012, 12:19 AM   #1
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Default Maplin JLH 50 watt amplifier article.

Here is all the info on the Maplin 50 watt JLH amplifier.

50W HiFi Power Amplifier LW35Q Maplin Kit
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Old 10th January 2012, 11:31 AM   #2
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Thanks. Do you have the article of the switchmode power supply, Id like to get my hands on that too. This is the stuff I messed about 20 years ago.
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Old 10th January 2012, 08:13 PM   #3
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Sorry I dont have details of the SMPS.

I built one around 1980. It was built for a disco but wasnt loud enough, in the end I went with the Maplin 225WRMS amplifier.
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Old 10th January 2012, 08:39 PM   #4
sreten is online now sreten  United Kingdom
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Hi, AFAIK it was not designed by the esteemed JLH, rgds, sreten.
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Old 10th January 2012, 08:42 PM   #5
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Hi Nigel .
By any chance do you have the details for the 1.2 Kwatt maplin amplifier kit

Regards Ian
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Old 10th January 2012, 08:54 PM   #6
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Quote:
Originally Posted by madtecchy View Post
Hi Nigel .
By any chance do you have the details for the 1.2 Kwatt maplin amplifier kit

Regards Ian
Sorry I dont.
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Old 19th May 2012, 07:56 PM   #7
blu_glo is offline blu_glo  England
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hi still looking for the smpsu circuit for the 50W maplin amp? I may have it if still required! will have to scan it in!
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Old 19th May 2012, 08:00 PM   #8
blu_glo is offline blu_glo  England
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cant help but think the original design suffered increased THD for having output fuse - I would scrap it and instead have 2 off same in each AC winding of the transformer before bridge rectifier.....
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Old 19th May 2012, 08:05 PM   #9
blu_glo is offline blu_glo  England
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I would like to get my mitts on a couple of these maplin 50W pcbs - in any working order- but must be complete with the r/a heatsink brackets!
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Old 20th May 2012, 05:46 PM   #10
jaycee is offline jaycee  United Kingdom
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I wouldn't imagine the SMPS is worth having by modern standards, except for possibly details on winding of the transformer. Nowadays you could build a simpler, more efficient SMPS using a controller like the TL494 or SG3525. The hard part is winding a transformer!
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