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Messages - casiomax

#1
Schematics and Layouts / Re: TDA2005 amp
June 09, 2008, 03:17:40 AM
Quote from: J M Fahey on June 04, 2008, 04:52:31 PM
Please post the "hmmmm"  schematic.

Hi J M,

the hmmmm schematic bridge configuration i took from the datasheet, unless I am reading the schematic wrong, a polar cap sign with black and white stripe, should be read white= + polarity, and black = - polarity.
#2
Schematics and Layouts / Re: TDA2005 amp
June 04, 2008, 06:19:36 AM
that hissing noise due to a reversed polarity on the input cap... I use polar cap, try to replace with MKT non polar, it worked, and put the input cap in reverse order, it worked!!.. but on the schematic it wasnt like that... hmmmm...???
#3
Amplifier Discussion / Re: LM386 based guitar amp
June 02, 2008, 12:54:11 AM
i built one of of the LM386, use a headphone, sounds very nice, although a bit of noise is audible. gain has a bit of clean distortion, interactively works with the level pot. the amp fit nicely on an empty namecard box.

#4
Amplifier Discussion / Re: *s!!t* guys
June 02, 2008, 12:50:00 AM
PC to Poweramp... PC has its own volume output settings, IMHO, output from the PC should able to drive a headphone, that should already be loud enough to poweramp input. so what went wrong? :D
#5
Schematics and Layouts / Re: TDA2005 amp
May 30, 2008, 09:50:49 AM
I did folow the schematic from the datasheet application, but maybe its just a missed wiring, all I hear on my speaker was a hissing noise.

I will check further, all I have now a working TDA2050 suppose to be higher wattage then a bridge TDA2005.
#6
thanks for the advice guys! appreciate it.
#7
Schematics and Layouts / Re: TDA2005 amp
May 25, 2008, 08:14:30 PM
i tried a Bridge configuration from the datasheet, but seems that it doesnt work. anyone had any experience on bridge config for TDA2005?
#8
I am forgetting the other important key to have a good amp, speaker. I have purchased vintage 30g12 replacing the one i have, suprisingly.... sounds a lot more better! nothings wrong with the input or my guitar.

but on my amp, i did not built the buffer stage, would this affect anything?
#9
will this design work? since i have 2 x 3Amp transformer but no center tap on the output voltage. anyone can help?

thx.

#11
question,  how do i make an attenuator? seems that from my guitar directly to the amp, when i crank up the volume, without an effect, the guitar sounded a bit distorted.
#12
Schematics and Layouts / Re: TDA2005 amp
May 14, 2008, 04:35:48 AM
maybe a 20k pot on the input side of the amp.
#13
Schematics and Layouts / Re: TDA2005 amp
May 09, 2008, 08:54:08 PM
Thanks for the information Teemu! Also, love your book.
#14
Schematics and Layouts / Re: TDA2005 amp
May 07, 2008, 03:14:32 AM
cmiiw, TDA2005 will draw max current at 4.5amp non repetitive, according to the datasheet, a 5amp supply transformer should be enough to supply the chip at 18votls with 2200uF filtering cap.
#15
Schematics and Layouts / Re: TDA2005 amp
May 05, 2008, 08:04:23 PM
@teemuk
thanks for the answer. in that case a full wave rectifier and a filter cap should be enough to power tda2005. would 20,000uF cap enough?