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Old 29th June 2005, 04:15 PM   #1
nifan is offline nifan  Germany
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Question looking for a cheap amp

hey!
im looking for a schematic and a board-layout of a good cheap amp... the best way is a class-t i think! its a project for school in physics! i hope somebody can help me and you enjoy my english ;-) i know its good ;-)

greetings from germany
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Old 30th June 2005, 12:37 PM   #2
nifan is offline nifan  Germany
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nobody?
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Old 30th June 2005, 05:32 PM   #3
dnsey is offline dnsey  United Kingdom
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How about Jan Fredriksson's AMP 3?
No problem sourcing components etc., and plenty of room for experimentation / modification.
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Old 30th June 2005, 06:49 PM   #4
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Hallo nifan ,

41hz audio sells PCBs and Kits for 3 differend Class D Amps .
Good Luck !
Greetings from Germany ( Bruchsal near Karlsruhe )

Jürgen javascript:smilie('')
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Old 30th June 2005, 07:08 PM   #5
nifan is offline nifan  Germany
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if the amps arent too expensive i will think about it! its just a project fpr physics! i dont want to use a big psu or something else but i want to use it for my tv after the presentation in physics so the quality should be not the best but better than the panasonic, aiwa or phillips blinky systems ;-) i live in germany so i think its not easy to buy a pcb form the usa, isnt it? where can i get Jan Fredriksson's AMP 3?
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Old 30th June 2005, 07:13 PM   #6
nifan is offline nifan  Germany
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i found amp 4... for 25€ inclusive components its a good deal! do i need a preampfiler or is a poti enough? what kind of poti should i use?

greetings from germany
simon
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Old 1st July 2005, 12:04 AM   #7
mb is offline mb
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A 12V SLA battery with ~10,000-20,000uF reservoir caps, ~20k volume control pot, and it will not only beat the Aiwa and Philips, but the NADs, Rotels and many others . A preamp is better (cleaner bass, better body in the sound), but can always be added later.

One of my Amp3s is destined to be a booster amp for my son's Aiwa minicompo. I replaced the speakers with a small pair of DIY speakers, and someday the Amp3 with take the headphone signal from the Aiwa and feed the speakers. I tried this with the T-amp, and he loved the sound. With the Amp3, he will make his entry into "hi-end" minicompo!
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Old 1st July 2005, 12:09 AM   #8
mb is offline mb
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If the source has a volume control (eg. Discman), you can skip the volume pot altogether.

Get an old Sony Discman; add a good low ESR cap at the battery supply terminals internally; connect to something like the Amp3, and you have a *killer* portable system. Bring it to a friend's house and hook to the $3k speakers and
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Old 1st July 2005, 12:39 PM   #9
nifan is offline nifan  Germany
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has somebody an example for a preampfiler? i prefere not to use a battery!

greetings from germany
simon
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Old 1st July 2005, 12:40 PM   #10
nifan is offline nifan  Germany
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what is the maxium for the power? what for a psu should i use?
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