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Old 31st July 2009, 02:50 PM   #6401
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as promised....

this is the old kenwood amp. i remove the old amp circuit and place the dx amp.

Click the image to open in full size.

Click the image to open in full size.

and this are the two speakers(rewinded) i use.
Click the image to open in full size.

thanks again carlos
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Old 31st July 2009, 10:41 PM   #6402
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Default Thank you , as you have shared your pictures with us


Was nice to see the Dx Amplifier inside the kenwood case.

Despite some kenwood use the same circuit...well..almost the same.

regards,

Carlos
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Old 1st August 2009, 12:06 PM   #6403
AndrewT is offline AndrewT  Scotland
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what is the point in posting these 1600*1200 pixel blurred pics?
Wasting bandwidth and download time and scroll time to get past them.
Compress them to a sensible small size and attach the tiny files that are left directly to the Forum post. Leaving the reader with the option to expand the thumbnail or not.
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regards Andrew T.
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Old 2nd August 2009, 07:40 AM   #6404
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Default La Ode has made a very nice board


My prefered one, as he have installed all transistors into the heatsink...the best solution, or the most pretty one.

I hope La Ode has the board layout, i have searched and could not find it.

Here is the board...in my point of view, to my eyes, an almost perfect board.... to be 100% the need is to clean excesses of thermal compound only and invert bolts and nuts...to allow us to see the screw head up

regards,

Carlos

Click the image to open in full size.
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Old 2nd August 2009, 08:21 AM   #6405
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Default La Ode Torega made a really great job


Colours used, and the parts position, sligthly different than the original board, result even better to look at it.

I will be using, for a while, in the avatar position to thank La Ode Torega.

regards,

Carlos
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File Type: jpg la ode torega pcb.jpg (61.5 KB, 544 views)
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Old 2nd August 2009, 03:08 PM   #6406
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Default Currents flowing...to understand the currents flowing... the easier


way, is to accept (understand) that currents can flow from positive to negative, also can flow from negative to positive, also can flow from ground to positive..and also from ground to negative.

Doing this way, you will find much more easy...so...for a while, if you wanna understand the stuff, be flexible..forget that electrons are negative and flows to positive points.

Currents crossing resistances..if from left to rigth, or rigth to left.......if from up to down or the opposite..... in all modes, will develop electrical potencial...will develop voltage into the resistor extremes..so..this is what you want to decide values.

Observe the image and take a look.... i hope this helps.

regards,

Carlos
Click the image to open in full size.
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Old 2nd August 2009, 03:12 PM   #6407
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Default Here you have a pdf.... this may helps the beginners


to understand...and to design their own amplifier....will be very easy.... a very easy next step.

But first...forget that electrons goes to positive....mine goes to the direction i want, or i need...this turns understanding easier.

regards,

Carlos
Attached Files
File Type: pdf current flow.pdf (90.5 KB, 154 views)
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Old 2nd August 2009, 05:44 PM   #6408
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Default Selecting a topologie, and after the currents decision


You decide the voltages, and this is easy, as diodes referenced to the output line (zero volt) will present 600 milivolts...so...it is easy to realise.


Knowing the current (your decision or based into other designs) and the voltages needed (also your decision or based into other designs) you can enter the ohms law to calculate the resistor values.

R=E/I....... Resistance is the result of the division when you have the voltage upper into the ratio, and the current down.

This works for a starting point...the amplifier after construction operates.

Do your own.... a DIY is to do your own.... no problem to use this schematic, it is Universal..i would just ask you not to publish here...our forum has already many boostrapped designs..we need room for more creative and advanced guys to offer us more modern and different circuits.

regards,

Carlos
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File Type: gif dc voltages referenced into the ground.gif (44.6 KB, 284 views)
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Old 2nd August 2009, 05:48 PM   #6409
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Default You see that DC simple calculations has absolutelly no mistery


It is easy and works too...more sophisticated designs works even better...for sure this happens, including the AC calculation makes the amplifier more precise considering many other things.

But this is a nice way to start and to have fun.

Think into "Voltage Drop"..if you have 20 volts upper the resistance and 1.2 volts down the resistance..then the voltage drop is 20-1.2- 18.8 so, enter the current and calculate your resistor.

Easy!

needing details, having doubts..i am here to help (I have my knowledge limits, but others can help too).

Beeing shy, write to:

panzertoo@yahoo.com

I love to help folks!..... i feel good!...so, this does not bother me.

regards,

Carlos

.................................................. ..................................................

Just be kind with uncle charlie..do not publish a lot of "samething"..if you have a real different circuit, not a resistance of a CCS, then show us..but please..to be repeating is really boring... do it..but do not publish otherwise you had new ideas..really new things that will really change sonics....what i could see last monthes is 12 and dozen....CCS here, current sink there, double VAS and subcircuits were tried into Precision 1 and HRII.....offer to us, if you have, something new...alike Stee and others
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File Type: pdf dc voltages to ground.pdf (42.4 KB, 103 views)
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Old 20th August 2009, 12:19 PM   #6410
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Default Build an amplifier folks!.... do not matter what amplifier..do some for your own good

Fell the pleasure to listen something you have designed, or build/tweak/created/modified.

Enjoy your life, and join the big builders group that populates this forum.

Solid State Gruppen!

regards,

Carlos
Attached Images
File Type: jpg Solid State Troppen.jpg (55.9 KB, 141 views)
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Brazilian Airways Christmas Message to all of you!
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Last edited by destroyer X; 20th August 2009 at 12:23 PM. Reason: text correction...language
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