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Chip Amps Amplifiers based on integrated circuits

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Old 23rd May 2010, 06:30 AM   #1
digi01 is offline digi01  China
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Default play around small chips(tea2025 btl)

i made tea2025 connected in btl,2 x 5W chipamp.very low cost & sound sweet.

have fun
-zang
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Old 25th May 2010, 10:05 AM   #2
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I got one of those plastic computer drive bay amps. It had two corny speakers like 2" apart and a headphone jack. It fits into an optical bay. I took it apart out of curiosity. They exhibited a hum when I used the headphone jack. I discarded the swiveling box, speakers and kept the circuit board and cords. The chip inside is a tea2025b STEREO AUDIO AMPLIFIER. Weird thing, the silkscreen on the board said for 12v input.
The power cord with the molex connector was wired to deliver only 5v.
So I look up the specs on the chip and it said it needs a minimum of 3v and a max of 12v. So whoever made this amp was cutting it really close. No wonder it sounded bad.
When I tried it again without the speakers wired in, there was no hum out of the headphone jack and the quality was excellent. I would recommend making a nice headphone amp with a nice aluminum project box, a circuit with the above mentioned chip, and for a happy medium; run it on 9v with 6 AA batteries.
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Old 16th January 2013, 01:19 PM   #3
Mihkus is offline Mihkus  Estonia
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Heya, i got problem mine is clipping hardli sinewawe more like 1-2hz, what could be the problem?
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Old 16th January 2013, 02:22 PM   #4
gootee is offline gootee  United States
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Quote:
Originally Posted by Mihkus View Post
Heya, i got problem mine is clipping hardli sinewawe more like 1-2hz, what could be the problem?
Motorboating?

What capacitor values did you use, and where? A schematic or photo would probably be helpful.
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Old 18th January 2013, 04:43 AM   #5
Mihkus is offline Mihkus  Estonia
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All electrolytics are 100uf 16v and input 1uf MKT
Took the pcb from here but made it bigger so i could install small heatsink...
Btw it is motorboating, i think its not burnt or so just maybe caps are "blown"?
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