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Old 4th October 2011, 10:48 AM   #181
Junie is offline Junie  Philippines
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testing in progress....

With 73v-0-73V supply voltage rail to rail, I got 64V voltage drop in 100R/10W...damn crazy high, something is wrong with my build...
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Old 4th October 2011, 10:51 AM   #182
AndrewT is offline AndrewT  Scotland
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Where was your bulb tester at the time? In the cupboard, maybe?
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Old 4th October 2011, 11:03 AM   #183
Junie is offline Junie  Philippines
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Originally Posted by AndrewT View Post
Where was your bulb tester at the time? In the cupboard, maybe?
I will use that bulb now Andy..

though this happen, I got no blown fuses, no burning trannies or smokies parts..maybe bias problem?


Will be back on that later, let me pick the wifey first
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Old 4th October 2011, 04:27 PM   #184
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Hi mister Junie! did you use a 45+45 toroidal transformer? is about 63.63 45x1.414 close enough to 64VDC rail to rail, maybe is a solder, I always check that is so damn small that solder can ruin connection between tracks well that can not be because that can cause burning tracks, now you got me thinking what can that be uhmmm?

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Old 4th October 2011, 04:45 PM   #185
Junie is offline Junie  Philippines
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Hey Amigo! I don't have that trafo what i'm using now for testing is the trafo i'm using in my precision and it's working fine in there. I'm wondering what went wrong, this is really bad the two module are having the same problem.
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Old 4th October 2011, 05:09 PM   #186
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Originally Posted by vargasmongo3435 View Post
WOW! they are different I just realize that now
Dear Vargasmongo,
Explain! what is different?
thanks,
Francois
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Old 4th October 2011, 05:22 PM   #187
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Default Is your bias trimpot adjusting?... say... changing current when adjusted?

Your current changes when you tweak bias trimpot?...if yes, then increase base to emitter resistance in order to decrease your current....if not, then search because you made a mistake..... you see that both amplifiers presents the same problem....seems the same mistake was made.

Be sure i have tested and i have tested with 84 volts supplies.... also i have tested with 4.5 volts, 12 volts, 20 volts, 35 volts, 45 volts, 55 volts, and 64 volts.. and worked fine in all conditions.

Check bias transistor position, check insulators, measure transistor colector and check if they are really insulated from the heatsinks.

Use a lamp in series with your transformer as your resistor will smoke soon and go searching...the mistake will be there waiting for you.... i am sure sooner or latter you will find it... relax...take a breath... take a rest...and go searching.

Picture is celebrating we now have a lot of oil...Brasil is becoming rich....80 percent of the population have high speed internet connections (120 millions with 10 Mega ADSL connections)... our payment was multiplied by 5 in the last ten years...we are giving money the the International Monetary foundation.... you see we gonna be the next important countries providing oil (also Ethanol) to the whole world.... we gonna be the next "Arabian Petrol Scheik"

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 4th October 2011 at 05:34 PM.
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Old 4th October 2011, 05:35 PM   #188
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Carlos, I was wondering; for the initial testing, can we use a low-current say 12V+12v 20VA transfo, or even two 9V batteries, just to see if circuit is functioning properly?

It's kinda risky to connect the "big engine" pushing 500VA into the board for the initial shakedown.

If we adjust the bias using a 15VDC+15VDC, will we need to re-adjust it at full 64VDC+64VDC ?

Regards,
Martin.
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Old 4th October 2011, 06:53 PM   #189
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well I use 3Watts not need to be 5W I'm not going to place a 4 voice coil woofers in a single channel
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vargasmongo
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Old 4th October 2011, 09:37 PM   #190
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Default Yes, you can use two 9 volts batteries if you want

The problem is that if you start having high drain of current, your battery will discharge very fast.... your 15 volts low current supply will be better...but be aware you may suck more current than your regulators (If LM7812) can allow you to use...but give a try if you have a non regulated (without IC regulators in the output as series pass voltage regulators).

I cannot remember, but i suppose the presence of a CCS will alow you to adjust once..... as i said, i am not totally sure about....maybe a small fine tuning will be needed in the stand by bias trimpot....because the voltage will be really a lot different than the standard voltage... CCS can help but cannot make all that magic...maybe will be out of range of CCS to keep things in order.... and we have a bootstrap following the CCS and this one produces voltage drop too.

Sorry, i cannot remember.....but i do think you will adjust only once.... or will need a small touch after first low voltage adjustment.

After your future testing, please inform your results to confirm or dennie what i am saying in order to help others.

Man..... i cannot remember....terrible when we reach 60 years old and we start to forget important things.

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 4th October 2011 at 09:41 PM.
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