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Old 15th October 2008, 11:09 PM   #11
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Default Hi!

Quote:
Originally posted by jacco vermeulen
Tomas,

ditto here, me old and blind.
(bigger pics of the girlfriends too, please)
For Me 2!!

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Old 16th October 2008, 06:00 AM   #12
lineup is offline lineup  Sweden
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You can download Aleph 4 schematics from Russia.
http://schematic.narod.ru/a_index.htm
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Old 16th October 2008, 07:07 AM   #13
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Default Hi!

Thanks LineUp, but this is Gen. Pass Labs Service
manual!


I ment schematic of t_majerovic!

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Old 16th October 2008, 07:26 AM   #14
lineup is offline lineup  Sweden
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If I wanted to build this amplifier and had 2 versions to chose from: N. Pass or T. Majerovic,
it would be a nightmare to make up my mind.
They could both work very well.

One thing extra in Majerovic's version is relay operated protection circuit.
Otherwise I do not think he has changed much form the original.
I would not do this myself.
Because Nelson test his amplifiers well before offer them to people.
He does not only listen to the sound. He makes some nice data curves, too.
In order to be sure he is not imagine and to trim for best electrical performance.
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Old 16th October 2008, 12:45 PM   #15
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Default Hi LUP!

Relay operated protection circuit.

That what I, tallking about!

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Old 16th October 2008, 03:50 PM   #16
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Cool Comment

Audio part is Aleph 4.0 without any modification except replacement IRF244 by IRFP240 and my own PCB design. Power supply (with soft start on/off sequencer) and speaker protection circuit are my own design. I prepare schematics in better quality and attach here.
Protection circuit must be part of each kind audio power amplifier without output capacitor. I follow this rule and it save my speakers many times. I also prefer delayed switch on amplifier output.
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Old 17th October 2008, 02:27 PM   #17
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Default Schematics 1

Aleph 4.0
Protection circuit (tested on simulator only!)
Attached Images
File Type: gif aleph4.0-v.0.2_circuit.gif (36.9 KB, 1306 views)
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Old 17th October 2008, 02:43 PM   #18
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Default PCB Aleph 4.0

PCB wit Aleph 4.0 (except power mosfets) + protection circuit
Attached Images
File Type: gif aleph4.0-v.0.2_components_site.gif (53.8 KB, 1226 views)
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Old 17th October 2008, 03:12 PM   #19
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Default Hi t_majerovic !

That what I, tallking about!

Nice work, what about "Values"of parts?

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Old 17th October 2008, 07:20 PM   #20
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I didn't publish values because protection circuit is tested only in TINA simulator and not on real/physical circuit. So I can't 100% promise that this schematics will work without any modification. So, anyway. If you are interested here is exported schematics from TINA simulator.

Few notes to components values/types are here:
switching transistor controlling relay is replaced by TIP117 TO220 in physical circuit
R13 (connected to emitter of TIP42 ) presents relay internal resistance - FINDER 40.61S, 24V/900R,One pole
zener diodes Z2 & Z3 1N3022 is replaced by BZX85/C15 in physical circuit
zener diode (connected to collector to TIP42) is replaced by BZX85/C24 in physical circuit
bidirectional dual color LED diode is BL-BHG234
switch SW-SPST1 in simulation circuit is replaced by LTV826/DIP8 in physical circuit
C1 47uF in simulation circuit is replaced by two 100uF capacitors C7 & C8 in physical circuit

Expected issues:
circuit sensitivity (too big)
insufficient current over dual color LED
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File Type: gif dc-detect_simulation.gif (13.7 KB, 1141 views)
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