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Old 21st November 2012, 12:44 PM   #321
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FB400 is based on Zeck schematics, use protect from Zeck, and if you want IRFP for driver use Electro-Voice schematic from SX300 powered speaker.
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MOSFET/BJT QUASI AMPLIFIER WITH PROTECT!!!
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Old 24th November 2012, 04:19 PM   #322
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Quote:
Originally Posted by apexaudio View Post
FB400 is based on Zeck schematics, use protect from Zeck, and if you want IRFP for driver use Electro-Voice schematic from SX300 powered speaker.
Regards
MOSFET/BJT QUASI AMPLIFIER WITH PROTECT!!!
thank you Mile,i havenīt seen this post untill now. i can see even now that there will be some "copy/paste" from your NE555 protection pcb!
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Old 6th December 2012, 09:20 PM   #323
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Quote:
Originally Posted by apexaudio View Post
No in this circuit.
Thank You so much for the advice, Sir.
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Old 15th February 2013, 09:53 AM   #324
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Quote:
Originally Posted by apexaudio View Post
I'm considering to remake this good old amps with some improvements...
If you do that please inform me! I have started to build this amp and in pictures down you can see what i did up til now.

The reason to build this amplifier was as for all APEX amplifiers: strong recomendation in long and reliable work of his amplifiers in hard and not forgiving environment,in places with a lot of cigarette smoke and high humidity like this one on picture:http://www.diyaudio.com/forums/attac...fier-apex2.jpg

The other reason is comments like this one,from our friends that listened a lot (and more than that) high class amplifiers for a long long time,from people that know why they said the thing they said-i will try to translate from ex-YU to english:

"....the amplifier it self worked nice on a small voltage regulator (NAIMīs from Nap-140),it has plenty of power and it did not heated much. By the way,the amplifier draws about 30mA (works in class B) and it can be overdone in AB class although i havenīt had any regrats on the sound at that little time i have listened it. The DC offset was 1,7mV on one chanel and 1,1mV on the other-due to contribution of the small IC
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For home listening some parts can be omitted:R1 R2 C1 D1 D2,for R22 we put the trimer and BD139 put on a heatsink with output transistors-to convert it to AB class. The amp works at +/-56Vdc but it also can work at +/-35V-all checked!
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On the amps sound i havenīt find any objections,it works just fine!

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After some time i have finished it,the amplifier is in the box with bias set on 70mA per pair of output transistors. DC offset is (really OFF) at one chanel 1,1V and on the other 0V. The PSU is now +/-60V with 2 x 10 000uF. I needed to raise bias because of my loudspeakers(high sensitivity) but on the other loudspeakers everything is all right. It expects some better input capacitors,it has really a lot of power,excellent sound and it is fantastic high frequencies. It is really nice amp to be done!
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This is something i really did not expect from one essentially PA amplifier,it reminds me a bit on Vinton or even Hafler Trans-Nova. Hafler was with me for a long long time,excelent amplifier..."


The reason that i mostly believe in comments from people i know well on forums is that they donīt want to sell me anything,they are not working for anyone and not burdened with money.

This same friend of my said once that this amplifier has given to him a bit more than 200W of power at 4R load...all in all,great amplifier in progres for me,thank you Mile Slavković!
Attached Images
File Type: jpg 2013-02-13-084.jpg (109.1 KB, 663 views)
File Type: jpg 2013-02-13-087.jpg (127.0 KB, 635 views)
File Type: jpg 2013-02-13-089.jpg (124.0 KB, 583 views)
File Type: jpg 2013-02-13-091.jpg (124.9 KB, 561 views)

Last edited by 44250; 15th February 2013 at 10:01 AM.
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Old 15th February 2013, 01:19 PM   #325
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Nice work, what about SMPS?
Regards
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Old 15th February 2013, 02:30 PM   #326
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I must learn how to wind storage coil in between secondary rectifier and filter capacitors. It will run both chanels of F100 in the begining and when i get done another smps or boost power of this one than the amp will be done. The power of this smps is 300W but it has shown all right even with about 400W load.
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Old 16th February 2013, 02:36 PM   #327
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Bias set on 120mA total (60mA / pair) and works with smps. At low power it sounds excellent,hope that this way it will stay at whole range of power. For now it looks great!
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File Type: jpg 2013-02-16-096 (1).jpg (207.3 KB, 505 views)
File Type: jpg 2013-02-16-096 (4).jpg (98.7 KB, 117 views)
File Type: jpg 2013-02-16-096 (2).jpg (225.9 KB, 94 views)
File Type: jpg 2013-02-16-096 (3).jpg (184.9 KB, 92 views)
File Type: jpg 2013-02-16-096.jpg (210.6 KB, 86 views)
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Old 16th February 2013, 03:51 PM   #328
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APEX F100 by 44250 (with smps power supply) - YouTube
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Old 17th February 2013, 08:57 PM   #329
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F100
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File Type: jpg 2013-02-17-109.jpg (91.2 KB, 130 views)
File Type: jpg 2013-02-17-112.jpg (82.0 KB, 68 views)
File Type: jpg 2013-02-17-110.jpg (89.8 KB, 65 views)
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Old 8th April 2013, 09:31 PM   #330
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theb0b asked me to put files of smps in this thread so here they are.

i used e33 from pc supply with 0,6mm diameter wire in primary and 0,7mm wire diameter at secondary winding.

first wind 20 rounds of primary,than insulation foil/copper foil/insulation foil,than both secondary 17 windings (2 x 17 copper 0,7mm),and than again insulation foil/copper foil/insulation foil,than remaining 20 windings of primary and again isulation foil+copper foil.

copper foils should have soldiered wires on them and when transformer is assembled those wires go to the ground.

transformer should be checked and rechecked many times if it has shorted connections between any of primary-secondary windings or between primary-secondary windings and copper foils,here are high voltages that are extreemly dangerous

transformer secondary should be connected as on picture below: A BC D where A and B are begining (A) and ending(B) of first winding and C and D begining (C) and ending (D) of second winding:so when you connect B and C that will be secondary ground and A and D will be connected to the bridge rectifier.

bridge rectifier is mentioned to be done with four double rectifier diodes,i used MUR1660 http://www.sirectifier.com/datasheet.../MUR1660CT.pdf diodes because they are cheap and can transduce 16A each. on this pcb they are connected in paralell so they are capable to transduce 32A.

in input bridge rectifier there are four 470pF500V ceramic capacitors in paralel with each diode.

storage coil is in my case 47 rounds of 1,3mm diameter copper wire on two gray torus core,you should use at least 1mm diameter wire and about 40 rounds on two torus core and connect it to the smps in that way that current will flow in same direction in paralel wires so they have same direction of magnetising the torus core. than connect the storage coil to smps,turn smps on without any load and monitor do the switching fets tourn heated;if not all is all right,if they do than reduce a few round from strage coil and try again untill ther work without heating on non-loaded smps.

first pluging on to 235V do over 220V40W bulb in series with supply,and use safety glases;that IS MUST BE!

if all is all right you will get these measurings at this smps between + and - outputs:

107V / 0,25A / 26,75W

105,6V / 0,47A / 49,63W

105,6V / 0,62A / 65,47W

104,9V / 0,81A / 84,97W

104V / 1,88A / 195,52W

103V / 2,75A / 283,25W

102,8V / 2,85A / 292,98W

102,5V / 3A / 307,5W

100V / 4,1A 410W

at no load there will be a bit higher voltage but after 250mA and all to the 4A there will be about 7-10 voltage drop,and bear in mind that this is 300W smps so it has been tested with 30% overload in my case. not bad for a such simple device. if you can and have,put bigger capacitor instead 470uF400V ,that will give you much better stability of output voltage due to higher current load. also give to switching fets and secondary rectifier diodes proper heatsinks,best if you have cooling fan.

for the fan you can add three more windings of some thin copper wire (no need for more than 0,3mm diameter) and with separate fast diode rectifier+4,7uF capacitor you will get 12Vdc for the fan-that is how i finally did it.
Attached Images
File Type: bmp Raspored za SMPS 300W EE33 bmp.bmp (88.5 KB, 99 views)
File Type: png Raspored za SMPS 300W EE33 png.PNG (61.0 KB, 187 views)
File Type: jpg SMPS.JPG (49.9 KB, 215 views)
File Type: jpg DSC02201.JPG (182.2 KB, 190 views)
Attached Files
File Type: pdf Pcb za SMPS 300W,atx trafo.pdf (20.4 KB, 108 views)
File Type: pdf Pcb za SMPS 300W,atx trafo i raspored.pdf (491.4 KB, 149 views)

Last edited by 44250; 8th April 2013 at 09:51 PM.
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