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Old 1st September 2011, 06:45 AM   #601
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Quote:
Originally Posted by MiiB View Post
I have not done simulation with the BD 140/139 pair.. so I think you must experiment a little..

You can measure the current in the output stage over the fuse..With my driver set simulation suggests something like 250 ohms...(I would use the trimmer to find the right value an than change to a fixed resistor)

Also the resistors setting the Driver stage current can vary a little.. in my simulations (with different drivers) 140 ohm gives app 20 mA which will be just fine..
good luck.
Ok than i will mount 14ohm on socket (that will allow me to replace and tweak easily without desoldering). For R13 I will reduce a little the initial value (300R) and complet with trimmer to find the right value.

Marc
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Old 1st September 2011, 06:56 AM   #602
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Miib,

Won't the actualy fuse place indicate the current in the "SSA" stage and the output stage?

Marc
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Old 1st September 2011, 07:11 AM   #603
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Quote:
Originally Posted by Idefixes View Post
Miib,

Won't the actualy fuse place indicate the current in the "SSA" stage and the output stage?

Marc
I self answer me after reading the topic. The mesure across fuse place (replaced by resistor) indicate outpu current by deducting input driver current (2-5mA not significant toward output current) and driver current.
Right?

Marc
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Old 1st September 2011, 07:15 AM   #604
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There is a mistake on my schema and than on my PCB : Q8 ECF20P20 is in the wrong sens Source to V- and not to OUT. I will correct. Thanks Helan for pointing.

Marc
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Old 1st September 2011, 08:29 AM   #605
radio is offline radio  Macedonia
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Hi ALL!!
I am finishing this amplifier!!
Give the schematic and makes the final PCB for this amplifier with the transistors pair of outgoing 2SC5200/2SA1943, with power supply Ucc = + /-36VDC.
great thanks and cheers !

P.S.
Hi and cheers Alex !
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Old 1st September 2011, 08:39 AM   #606
AndrewT is offline AndrewT  Scotland
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Hi,
you have shown capacitors across the rectifying diodes.
You may find that this increases the HF noise that is fed into the PSU.

Allow space to add a resistor in series with each capacitor.
See Hagerman and snubbers, etc.
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Old 1st September 2011, 08:40 AM   #607
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Quote:
Originally Posted by radio View Post
Hi ALL!!
I am finishing this amplifier!!
Give the schematic and makes the final PCB for this amplifier with the transistors pair of outgoing 2SC5200/2SA1943, with power supply Ucc = + /-36VDC.
great thanks and cheers !

P.S.
Hi and cheers Alex !
Are planing to share pcb and schematic to allows other to try?

Marc
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Old 1st September 2011, 08:49 AM   #608
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Exclamation SSA lucky DIY-er

Hi guys.

Nice to see some activity in SSA thread.

Who will be the next lucky DIY-er to experience the sound of SSA?

Regards to all, Andrej

Last edited by Lazy Cat; 1st September 2011 at 08:51 AM.
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Old 1st September 2011, 08:49 AM   #609
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Quote:
Originally Posted by AndrewT View Post
Hi,
you have shown capacitors across the rectifying diodes.
You may find that this increases the HF noise that is fed into the PSU.

Allow space to add a resistor in series with each capacitor.
See Hagerman and snubbers, etc.
Thanks AndrewT, I was thinking so too as an improvement, and for first fire up i plane to not mount 100n caps...I have enough place this serie resistor. I will do this modification.

Marc
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Old 1st September 2011, 08:49 AM   #610
radio is offline radio  Macedonia
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Quote:
Originally Posted by Idefixes View Post
Are planing to share pcb and schematic to allows other to try?

Marc
Hi
Good people (if I understood well) Why not??
thanks

Postscript
Only good and positive people can do such things!

Last edited by radio; 1st September 2011 at 08:52 AM.
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