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Old 24th August 2011, 12:10 AM   #1
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tom wesley's Avatar
 
Join Date: Jun 2010
Location: Pickering, North Yorkshire
Default Slimline P2P 1875 using spare bits. Pics.

Hi folks its been a while since i posted anything on the forum so i thought id share some recent pics of one of my latest projects.

The pics show the amp in an unfinished state, with PSU instaled and one ic partially connected. It took only aweek to get to this stage. After accuiring a ridiculas car amp about two weeks ago i thought the quality heatsink / chassis would make a good base for a slimline amp possibly with / glass / perpex top? As luck would have it i had also stripped out a low profile traffo from a dead Tascam mixer which JUST sits in chassis. The building blocks were in place so why not build it using some LM1875's which i had planned to try point to point wiring with.

All parts came from bits i had spare.

AC mains filter from Tascam mixer with traffo which incidently has perfect secondariers for this IC with 19v 0v 19v (ac) winding and a further 2 pairs at 10v (ac) which can be seen on pic as bunch of wires with white connector. i shall probs use these for a small fan or leds on their own circuit.

35A can rectifier from my stock
Elna 4700's (low profile) for main filter caps scavenged from another car amp.
solid core DC rails stripped from mains wiring off cuts.
New rear panel cut from thin metal sheet from scrap.
Mains switch from PC PSU
Speaker sockets reclaimed from old PA cabs.
Phono sockets from vintage Technics tape deck. (not on pics)
Ceramic fuse holders from Vintage Armstrong receiver
All other components and wire just fro my spares box(s)!
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I hope to get the amp going by week end, ive tested the PSU etc and alls fine.

What started as a bit of daftness is growing on me so i might keep it! I will post more pics on completion . Let me know what you think Guys..

Thanks Tom.

B.D.U.A
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Old 24th August 2011, 12:56 AM   #2
johnr66 is offline johnr66  United States
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Join Date: Mar 2009
Nice use of an old car amp! That gives me ideas...

Check the amp for operation by connecting a couple 9 volt batteries for the rails before connecting the main supply. One wiring mistake and you have to redo the thing.

I would recommend PSU decoupling film caps very close to the chip as possible.
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