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Old 17th June 2008, 01:54 PM   #11
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Default Just a disgusting amplifier....hehehe..to the competition


Bring the hammer.... you gonna have rubish.... hold your trash box.... your old amplifier will be trown away.

My amplifiers are turning so good....but so good that one day i will have my teacher, Mr. Hugh Dean, inviting me to a society..unfortunattely i will die for a heart attack because of emotion...the big Master of the Universe...the doctor of amplifiers (sonics) inviting me to business.

I will be a smilling dead man.... sing "never mind, be happy" into the burial cerimony.

My picture, a disgusting pride... receiving the title from the Academy of Sonics.... Brass medal of "force things to work"

regards,

Carlos
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Old 17th June 2008, 02:22 PM   #12
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Default To the input... differential PNP transistors use


2N5401... voltage there will be 70 volts, and you can see this transistor can work into higher voltages.

Under those transistors the CCS, mirror or current sink (do not know exactly the name), those down ones working as coletor loads for the differential amplifier..use 2N5551 (check the number if this is really the complementary.... as in my home i use BC556 and BC546)

To the voltage amplifier, the small one, the NPN can be this last one written above.... the second one, the master, use a low capacitance unit able to hold 150 volts, more than 5 watts, and gain from 50 to 120.... the 2SC4793 will work there,....but there are others even better to this position, the ones have lower capacitance....you may select your own choice...voltage there will be almost rail to rail swing (maximum possible less saturations and losses)... so take care of that.... limit of voltage...also the power there is not bigger than 3 watts to select heatsink.... please, do not put this transistor into the main heatsink...not a good idea..let it into the board with a 1 1/2 square inch aluminium heatsink or another able to dissipate 3 watts continuously.

To the drivers, use those plastic ones...they are excelent, huge, reliable and do not need insulators...black plastic material (plastic because you are able to make it in many shapes, have plasticity)... they are strong to the work there, can hold the current (lower than 20 miliamps into stand by mode) and the power there... also small...but those can go to the main heatsinks if you want them there....or not!

To the output, use the ones you like, as the most used ones are very good...those motorola are famous and a lot of folks love them.... those 2SC5200 and 2SA1943 are very used in my country...very good ones, in special de Fairchild ones.... you can use even the old Motorolas, thos MJ15XXX and others... the 15 thousand series...... The Sankens are excelent, the better ones, the 2SC2922 and 2SA1216 are great....so....your choice.

To the heatsink dimensions, first let me know your voltage, style of music, impedance used and the power you will use.

Put a multimeter into your audio output, together the speaker and adjust to the level you like..... check the AC voltage, the maximum reading, they are RMS and not precise into frequencies above 500 hertz.... they are made to mains voltage frequencies...but i will have an idea of the average power you use...and if you want more or if this is the way you like.

Those things will help me to help you Space.

Carlos
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Old 17th June 2008, 02:23 PM   #13
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Default Another image of transistor specifications


be carefull when using those transistors, the 2N5401.... they have different leads compared to some other units...be sure you will connect the correct leads into the circuit.

attached,

regards,

Carlos
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Old 18th June 2008, 12:56 AM   #14
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Hi DX,

Good morning. Here is my requirement as you asked for.

Transistors I will be using 2sc2922/2sa1216 or 2sc5200/2sa1943, I will check both which sounds good, I will use that.

my parts bank have some stocks. 2n5401,2n5551, 2SC4793,2SA1837,BD140, BD139.
I think few from this you used in this circuit right, its easy for me to build ? This design much more easier to make then prc-1. As my exp, Prc-1 not so easy to make from design.

As I have two spare transformer is 60vdc, 10amp each. I won’t operate more then 60vdc. I never listen more then 50% to 60% of the total power RMS. I try to use low volume to listen so the sound gets btr.

My speaker, I am not using too low imp sp like 4ohms…my current speaker is 6ohms and also have 8 ohms as you have seen 8 ohms speaker at the forum. If I operate in lowest then 4ohms will be most lowest, so far I don’t have any 4ohms speaker. I don’t like 4ohms….I like 6 or 8. As I have one speaker box with very good quality with heavy woofer 6ohms, now I am using this for prc-1. Very nice bass can be produce form there. This speaker is not good to use in 60 or 80w amp. It is good if above 100w amp.

Anyway you can recommend which will be btr to use. All I need is btr sonic and sound quality with tight bass. I often listen those are slow music with nice rhythm and lots of music instruments, classic and solo music. They require tight bas with nice treble. As I am playing violin and piano so I like more on musical. I don’t listen rap or disco song.

I will send you few songs, indian Gosal and english song. It is the way you can adjust the tone so beautifully. Very, very sweet voice and music, Also violin music.

Pls check your email later on.

Remarks: just tried to send you song, i don't know your email address.

Best regards
michael
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Old 18th June 2008, 09:22 AM   #15
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Default All rigth...will return directly to your mail when ready


I will study something to your own character and use.

60 volts DC..... hummmm...quality.... not a real powerholic, seems you have no sensitive speakers.

may E mail adress is:

panzertoo@yahoo.com

You are welcome here....but i am afraid you enter with strange letters....those i use to delete, as i cannot read...but will observe the message size, or attachment from now on.

regards,

Carlos
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Old 18th June 2008, 09:41 AM   #16
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Default Todd Johnson is preparing a nice schematic.


Soon i will publish the final one.

Here is a sample....excelent quality into schematic production...Todd is great doing those things.

regards,

Carlos
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Old 18th June 2008, 05:58 PM   #17
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Default The unit was made to long time power delivery


and it is beeing constructed using more transistors into the output...of course.

Those output transistors into the schematic are only suggestion, and will depends on the impedance and type of job the amplifier will face...if heavy duty, over 2 ohms.... 12 pairs or more gonna be used.

Schematic made to 8 ohms and normal music reproduction that uses to be into average power levels... but for instruments, public adress or live shows, using, guitar, bass and other sources of sound... using mixer output..then we gonna need more power transistors.

Brazilians use to go to the beaches during the weekend and holidays, and then, loud music, dance and beer will be with them for whole day.

My friend Mano Brown and his Brownies

regards,

Carlos
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Old 18th June 2008, 06:00 PM   #18
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Default They use some 200 watts, extra heavy duty speakers


and the volume is the maximum they can have without too much distortion... and for sure, as more beer is consumed, they become very tollerant about distortions.

regards,

Carlos
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Old 18th June 2008, 10:11 PM   #19
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Default DHR voltages referenced to ground


Attached,

regards,

Carlos
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Old 18th June 2008, 10:12 PM   #20
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Default DHR current



attached,

regards,

Carlos
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