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Old 20th February 2007, 04:13 AM   #111
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thanks Carlos,
for accepting my opinion related ilimzn....
and congratulations - the board is looking really nice...as lineup said - not to small, really nice and clear looking....
i am working on something at my home (another amplifier), but as soon as it is finished i think i will start working on your amp...i have just about right psu and output transistors...
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Old 20th February 2007, 04:43 AM   #112
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Quote:
Originally posted by tinitus
Looks neat and simple enough to be hard wired

But in last schematic its not really clear if crossing traces have connection or not
Hi tinitus,

There are a couple of neater schematics on page 1 by Sparkle and myself that will clear up any confusion.

regards
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Old 20th February 2007, 06:55 AM   #113
Vurguuz is offline Vurguuz  Russian Federation
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What type of PSU should be used with this amplifier? destroyer x talks about carlosfm's snubberized supply - is that regulated or not? is it the chipamp one without any modifications?

also: what value of psu output voltage is required? carlos said that he uses 39V, but that seems a little too much for my needs..

sorry if these questions seem silly.. and thanks for any answers

Max
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Old 20th February 2007, 08:44 AM   #114
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Default Well guys...i will answer you all in this post.

Sparkle - you are always welcome, and your desire is an order to me..you use to be very honest, intelligent and kind...an i have enormous respect related you.

Tinitus - good idea to make it hard wire, for sure pretty PCboards will not increase sonics...this way is good and use to be pretty too.

Mark - hummm, Salt Lake City...i envy you... i would love to squid with my car in the Salt Lake...we have anything flat in my country... but lucky we are related girls...no one is flat here too...This amplifier thopologie is not new...it was used since seventies..very common to find this one (or alike this one) in many guitar amplifiers and professional applications too..it is simple and good..i did not discovered it...the thopologie was a choice to produce something good...based in real life testings, removing a capacitor and replacing it by other...this way...nothing extraordinary in intelligence..just sweat, hard work, persistence and passion.

Line up...thank you, as usual, you are kind with me.

Greg Erskine - thank you once again by the pretty board...already resulted in some money entering my left pocket...this one is to buy electronics parts and gadgets.


Vurkuuz - The amplifier was tested with 22 volts, 35 volts, 39 volts, and something alike 55...the 75 volts unit was only simulated, also 16 volts was simulated.

The amplifier can work with the voltage you have up from 16 volts simetrical supply....but off course many adjustments will be needed....using it with 16 volts, for instance:

VR!, the off set trimpot, will need a 10K unit, it will be adjusted around 8300 ohms

R10 will need to be replaced by 5K6

The bias trimpot, a 100 ohms unit will be adjusted to mid range

The resistor will need replacement to 820 ohms

Bias will need some adjustment, output current may be 15 to 20 miliamps

Big transistors will not be needed anymore

Input should be replaced by BC557

Voltage amplifier and drivers can be BD139 and BD140

Output can be TIP3055 and TIP2955...or others alike TIP41 and TIP42 and many others..hundreds will fit.

The output power will be smaller than 20 watts over 4 ohms...and near 10 watts over 8 ohms.

High power versions...as i have published the turbo version and the Ignitor was made only to Sparkle, will need diodes (3) in series with the bias trimpot...pointing down the component arrows, they will need to touch the heatsink to control the temperature...but small power versions... under 22 volts may not need, as small heatsinks will fit.

To use it to produce 20 watts over 4 ohms, for instance, with a 16 volts simetrical supply...you will need an aluminium plate of 20 centimeters long to 10 centimeters ...and it can be twisted the way you want to make it smaller...U shape, L shape and others.

When using small voltage, your electrolitic condensers will be small in size...alike the Model i have post...the amplifier will turn more pretty will smaller condensers

You have just to inform me the voltage you have...and if you have some intentions to construct, i will re-calculate, and test real world the voltage you need....re constructing it, customized to you.

I will prepare my supply diagram...very simple.... I will post it here soon

regards,

Carlos
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Old 20th February 2007, 08:46 AM   #115
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Vurguuz,
i am sure that this amp can be adjusted to work on Your voltage - please tell us which voltage You have - the adjustements would be minor and only related to dc offset...

edit - well, as allways Carlos was faster he posted while i was typing....

tell us please which voltage do You have - that is the best.....
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Old 20th February 2007, 08:51 AM   #116
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Default Yes...it can work without too many tweaks


In the real world....you may have to adjust off set and bias...the other adjustments are for perfection.... and really...perfection in this world.....hummmm

Maybe the neighboor chicken (the bird)...as we always think their chicken can be more delicious...we think they have less problems than we have...that they have more money than we have...well..this is some envy, delirium and normally not reality.

Thanks Sparkle...good.

regards,

Carlos
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Old 20th February 2007, 09:05 AM   #117
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Default I do not know if Carlos FM is still on line, with us, in this forum

He use to be in Chip amplifiers threads.

But he was very active....and when you are very active, you get
a lot of boering visitors....i do not know if he survived (psychologically) to the pression people make over those guys.

I hope he is fine....a nice guy.

This is the Snubber supply he made...he told that sounds good..well...i tried comparing and i perceived more punch...maybe the condensers, those big ones are making that job...i do not know...this is something to test once more.

I am using...because if not good sonically, for sure is not disturbing my amplifier..working fine..i can switch amplifier off and it delays 15 seconds to cut the audio...playing without bass and a very small audio volume of course.

I have included, in my supply, because of Bob Cordell, an inductor...extra series components...as you already have low value resistance that use to present some inductance too.

Mine has 30 turns, 1 milimeter diameter wire over ferrite bar...those ones used to portable AM radios antenna, and FI oscilator.

I do not think...well...at least i have doubts, that a simple supply, with just a rectifier and 2 electrolitic condensers....2200 each one for instance.... will create sonic problem...maybe you will have some small ripple when the supply was hardly used during bass periods....maybe in the scope you will find awfull things...but reall life...hummm..... it will work.

C'a marche (CarlosFM good bye)

Carlos
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Old 20th February 2007, 09:11 AM   #118
Vurguuz is offline Vurguuz  Russian Federation
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Thank you destroyer X and sparkle I can get 2x25V 4A or 2x35V 3.2A transformers for the same $$.. And leaning towards the former, is this correct? I'm also at a loss as to what circuit would be best to use for the power supply. Having had no previous experience with building them it's difficult to form a personal preference ..
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Old 20th February 2007, 09:13 AM   #119
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once more - but it can't hurt to much - Vurguuz - you can find more informations here at this link - it is very good and related to this power supply that Carlos presented above...

http://www.tnt-audio.com/clinica/ssps1_e.html

i have tried it and it is very good... follow the links at the bottom of this first one to go to the Part 2 and to the Part 3 .... it will help You a lot...

my humble opinion is that the first transformer (2*25V/4A) will be more suitable for You .....

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Old 20th February 2007, 09:16 AM   #120
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Hé Machismo,

after reading your stuff from yesterday, it sounds like you've been eating your neighbour's chicken again.
It would be a shame not to hear Ilimzn, Croatia would be a far away place without forums.

PS:
These forums are often amusing and confusing.
Some put on a funny nose, without the funny nose they're hyperactive and viable to change into the most aggressive individuals you can imagine.
Others often display a hot temper, in real life they're sweet kittens.
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