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Old 18th December 2014, 01:32 PM   #1
Halair is offline Halair  Norway
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Default Halair's F5 build

Hi People

Long story short, I built myself a pair of fullrange line arrays this spring (my first diy speaker project) and since I know very little about electronics the obvious next step would be to make my own amp

I am curious of class A amplification, the NP F5 is well documented, low part count so seemed to be a good place to start

Currently aquiring the necessary parts and waiting for delivery on most of the little stuff. Transformer is a 400VA/2x18VAC toroid and cabinet is a 4U/400mm unit from Modushop.biz in Italy. Both are in house. PCB bought from DiyAudio Store, transistors from h_a and JFET's from Spencer, rest is pretty much via ebay.

My main intent for this thread is to share my experience and seek information/a little guidance along the way I have read a lot in here including the how-to\s provided by L6L and others and it is sinking in

The speakers intended for this amp is a 20driver full range line array with nom. imp=6.4ohm. Calculated 98dB sensitivity => should work ok?
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Old 18th December 2014, 01:36 PM   #2
Zen Mod is online now Zen Mod  Serbia
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Quote:
Originally Posted by Halair View Post
.....

The speakers intended for this amp is a 20driver full range line array with nom. imp=6.4ohm. Calculated 98dB sensitivity => should work ok?
naah .......

sissy speakers .......

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Old 18th December 2014, 01:56 PM   #3
Vix is offline Vix  Yugoslavia
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ZM forgot one word: Fugly

p.s Halair, the Pass amps are all good, it's just about your taste, so don't hurry with F5, there are many other nice Pass amps that will do fine with your "too tall" speakers
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Old 18th December 2014, 02:09 PM   #4
Zen Mod is online now Zen Mod  Serbia
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naah

no Fugly! without proper porn ( inside , please )

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Old 18th December 2014, 06:06 PM   #5
Halair is offline Halair  Norway
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Vix, thanks Fugly? Naaaah....
My impression of my arrays are that they are very articulated yet go surprisingly low, something I hope the F5 can continue to do. I have no idea what to expect but believe in having as little as possible in the signal path present. The arrays have no filters etc, only analoge EQ to counter the top/bottom rolloff inherent to arrays in general.

ZM, thank you too Hope to pick your brain later once the build progress
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Old 18th December 2014, 07:06 PM   #6
Halair is offline Halair  Norway
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Array build log here - Halair Column - my line array build (20 FR drivers)
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Old 19th December 2014, 02:35 PM   #7
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Halair,

Nice looking speaker. What is the bass response like from this type of speaker? Do you need a sub below 125Hz?

Vince
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Old 19th December 2014, 03:51 PM   #8
Halair is offline Halair  Norway
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A sub from 150hz would be ideal relieving the 3" FR from the most demanding movements, but they hold their own within reasonable SPL Ref attachment.
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Old 30th December 2014, 10:26 PM   #9
Halair is offline Halair  Norway
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Have I got this right?

Drawing show layout v1 for physical placement of one channel PSU, I am using 30pcs 2200uF/63V per side, 15 in front of and 15 after R5-8.
I have not correctly drawn rectifier negative to connect with PSU negative rail btw

Toroid will occupy the bottom left side of the layout hence the "heavy" PSU right side.
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Old 30th December 2014, 11:15 PM   #10
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wow. awsome speakers whats the impedance curv on those suckers?

here is my F5. Dual outputs. +/-24VDC and 2.6A bias.
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Last edited by AudioSan; 30th December 2014 at 11:17 PM.
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