Maplin JLH 50 watt amplifier article.

nigelwright7557 · 10th January 2012, 12:19 AM

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

50W HiFi Power Amplifier LW35Q Maplin Kit

homemodder · 10th January 2012, 11:31 AM

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.

nigelwright7557 · 10th January 2012, 08:13 PM

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.

sreten · 08:42 PM

Hi, AFAIK it was not designed by the esteemed JLH, rgds, sreten.

madtecchy · 10th January 2012, 08:42 PM

Hi Nigel .
By any chance do you have the details for the 1.2 Kwatt maplin amplifier kit

Regards Ian

nigelwright7557 · 10th January 2012, 08:54 PM

Quote:

Originally Posted by madtecchy

Hi Nigel .
By any chance do you have the details for the 1.2 Kwatt maplin amplifier kit

Regards Ian

Sorry I dont.

blu_glo · 19th May 2012, 07:56 PM

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!

blu_glo · 19th May 2012, 08:00 PM

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.....

blu_glo · 19th May 2012, 08:05 PM

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!

jaycee · 20th May 2012, 05:46 PM

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!

10th January 2012, 12:19 AM	#1
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	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 __________________ http://www.murtonpikesystems.co.uk PCBCAD50 pcb design software.

10th January 2012, 08:13 PM	#3
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	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. __________________ http://www.murtonpikesystems.co.uk PCBCAD50 pcb design software.

10th January 2012, 08:39 PM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, AFAIK it was not designed by the esteemed JLH, rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow Last edited by sreten; 10th January 2012 at 08:42 PM.

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10th January 2012, 11:31 AM	#2
homemodder Account disabled at member's request Join Date: May 2006	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.

10th January 2012, 08:42 PM	#5
madtecchy diyAudio Member Join Date: Dec 2010 Location: wigan	Hi Nigel . By any chance do you have the details for the 1.2 Kwatt maplin amplifier kit Regards Ian

19th May 2012, 07:56 PM	#7
blu_glo diyAudio Member Join Date: Aug 2005 Location: London, England	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!

19th May 2012, 08:00 PM	#8
blu_glo diyAudio Member Join Date: Aug 2005 Location: London, England	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.....

19th May 2012, 08:05 PM	#9
blu_glo diyAudio Member Join Date: Aug 2005 Location: London, England	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!

20th May 2012, 05:46 PM	#10
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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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