And if you connect it in parallel, you should get an operational time of: >30 hours!

WOW! We just exceeded 100 postings!

This post has been edited by jazzy939: Aug 16 2008, 07:28 PM

Okay, I guess that kills my brilliant logic! KIC wins the day!

This post has been edited by March05: Aug 16 2008, 08:25 PM

Not to worry bro March,
There's always more than one way to 'kill' a cat...
(NB:I am NOT a cat hater.. )

Attached, is the offending caps that came with the T-Amp...

Have removed the polarized 1uF from the assembly, will try connecting the two 1uF NP yellow caps in parallel which should give a total of 2uF for the input caps, dunno how the sound would be.. planning for late night operations...




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Your charging circuit will be enough, no need 2 batteries, quite heavy
In my setup, current draw just around 200mA AVG, so 7A/HR battery should last me >30hrs!
15hrs just a very conservative estimation.

Unless my Fluke meter tipu me

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Added on August 16, 2008, 8:31 pmhuhu...then let us two "uncle" working OT tonight

This post has been edited by ongbs: Aug 16 2008, 08:31 PM

ongbs,
am just wondering. how did you measure the current drain?
sure ah, not a 'fluke' reading? (pun intended! )

late night is the best time to do critical audio listening..

This also just came to my mind. Since the amp can be driven into clipping quite easily.. why not incorporate a 'clipping indicator'? This will help the user not to 'overdrive' the little fella... :

additional notes:
I found one circuit that uses 12VDC working voltage.. will update if found to be suitable for our purposes... need to scrutinized the circuit.

Found this instead. Simple and workable.

Audio Clipping Indicator

This post has been edited by jazzy939: Aug 16 2008, 08:49 PM

Just connect a Amp meter in series with the +12V supply, before going into the 12+ of the amp board.
My Fluke meter got "AVG" function as it will give out AVG current draw reading

Without AVG function it is hard to get accurate reading as the current draw keep on changing reflecting the input/output condition.
Max A I got so far when blasting FS around 2A+, but just for a short duration, like heavy bass.
Higher value of power caps will reduce this current draw from power supply.

Pls check the TA2024 pdf, there is a "fault" pin #19, it will indicate thermal overload or output short to graound, but not sure will it indicate "clipping" status.
It can't drive LED directly, you need a transistor of buffer to "light-up" the LED

For input signal overload there is another pin, #7.

This post has been edited by ongbs: Aug 16 2008, 08:55 PM

That is good. I'll accept your current drain figures without doubt! Good work bro!

The item highlighted is easily done! I'll try that out first! Remember KISS & KIC?

add. notes:
I have checked the datasheet. pin 19 will not work here


This post has been edited by jazzy939: Aug 16 2008, 08:57 PM

ya, just a transistor, a LED and 2 resistors will do the trick

Just a simple add-on, the idle current (no input signal) of this board around 65mA (x12V = 0.78W)
7A/hr battery will last around 100 hrs in standby mode.

That's what I mean:
"Pls check the TA2024 pdf, there is a "fault" pin #19, it will indicate thermal overload or output short to ground, but not sure will it indicate "clipping" status."

Unless the Amp IC itself built-in "output clipping detection", it is beyond my knowledge to add on a detection circuit, or it is no more KISS
This function is in-built in some National power amp IC, if memory serve me right they call it "SPIKE" function, The SPIKE will try to realign the output to a proper level to reduce clipping.

This post has been edited by ongbs: Aug 16 2008, 09:07 PM

wah uncle got good meterwor.....siao fluke ler dare you say it "fluke"

hmm a clipping indicator is nice,

the setup in my car kinda get louder by day...hmm...

btw the evaluation circuit is uploaded at 1st post

xtorm,
I noticed the same too in my set ups.. on both boards!

Have downloaded the eval. board pdf.. will have a look soon!

The soft clipping indicator will be just an optional add-ons.. KIC, remember?

huh...apa itu KIC?
KICK I know lah

This post has been edited by ongbs: Aug 16 2008, 09:20 PM

that's gabanyayaya's Keep It Cheap!

btw the clipping indicator is no major issue,right? We have good ears for that!
I'll KIV it first

This post has been edited by jazzy939: Aug 16 2008, 09:23 PM

great news...

more poison coming,

my supplier is working on a fully work up ta2024, it mayb cost doubler, more component will be put in, he mention 300 pieces. hmmm no KISS liao...hahaha, but sound reproduction will be better comparing to the current design.

he told me i tapau the last 12 pieces he got the low cost unit will still be in produciton, no worries about that.

gona go take out my unit and put back the full filter and test it out

hello friend,
we haven't fully recovered(rather not fully consumed the full dose) with this poison, now got better poison?
shall we ditched this poison? heck, NO!

hehe...no more KIC...upgraded to KIS liau ==> Keep It Syiok!!!

was trying to solder direct 12v to the chip (those printed on board kinda tiny due to design) and i mess up ended with this



over view, change the input resistors too, 1% 12k. normal metal film



This post has been edited by xtorm: Aug 17 2008, 04:11 AM

Whoa xtorm! Thats a 'major' surgery!
Whats the outcome?
BTW, do you know it's 4am when you posted that?

The doctor took 7 hrs break before continue the operation
His "operation tools" left somewhere else!
BTW, do you know it's 5am when you posted that?

This post has been edited by ongbs: Aug 17 2008, 05:37 AM

I was 'on call' and the 'patient' is under close observation, 18 hours have lapsed.
The good news is the 'patient' has shown an improvement, the 'operation' was a success
Now to prescribe a good 'medication'
Have to check out another 'patient' now

BTW, do you know it's 5.36am when you posted that?

Patient 1 was in surgery,
removed the suspected 'organ' and transplanted a similar organ from the donor (patient 2)

Attached are the sequence of the 'procedures'

Now Patient 2 is under close observation to see if this transplant will rejuvenate and make Patient 2 perform better

The doctor will report on Patient 2 progress soon.

This post has been edited by jazzy939: Aug 17 2008, 09:10 AM


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