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Old 20th June 2012, 08:02 AM  
Nelson Pass is offline Nelson Pass  United States
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Join Date: Mar 2001
Default Amp Camp Amp #1

Introduction

Do-It-Yourself audio is a great activity. Many major audio components are easily constructed and made to perform as well or better than what we see in the stores and at considerable savings. The process is educational and therapeutic and there are few greater satisfactions...

Last edited by Jason; 21st October 2016 at 05:11 AM.
 
3rd July 2012
Melon Head
Banned
It would be cool if you made the chassis design availabe eg maybe a few more pictures or a drawing. I love the simplicity of it
11th July 2012
thorstenlarsen
diyAudio Member
Hi Nelson!
I believe that you forgot the bootstrap resistor in the schematics. ( if you want current gain in the current-source. )
Thorsten
22nd July 2012
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Nelson Pass
The one and only
Are you referring to Aleph current source circuit? This gets its modulation
by tapping the load between the power resistors.

22nd July 2012
thorstenlarsen
diyAudio Member
Hi Nelson!
Yes I understand that. Ive build am amp with this nice Aleph variation (one less cap in the signal path than the standard Aleph). But the signal from Q3 goes nowhere, as it is shunted by C2. You need to insert a resistor between the junction C2/R7 and the collector of Q3.
Thanx for your inspiring work.
Thorsten
23rd July 2012
whyisjake
diyAudio Member
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Check it out here

Today you can even spot N-Brock on the home page
25th July 2012
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Nelson Pass
The one and only
Thorsten, the design is not in error, the AC voltage across Q3 is
deliberately shunted. The modulation occurs through the way the load is
tapped between the power resistors.

28th July 2012
thorstenlarsen
diyAudio Member
Hi Nelson!
Thank you for the explanation. Now I see how it works. Its not an Aleph, but rather a mu-follower/SRPP type of schematic, as Q3 is only active DC-wise. Probably sounds better like that, with simpler signal path and less feedback in the current source. Might build one with R 100 FETs.
Thorsten
1st August 2012
JZatopa
diyAudio Member
Nelson this is a great project but I would love to see you or someone take this one step further. The world could use a simple to build amp kit for beginners who want to get into building amps or electronics. Is there any chance of you or someone making a kit that includes the PCB, power supply, a heat sink and detailed instructions that explain what each part's purpose is and why it was picked? As far as I know, nobody is doing this on a truly beginner level and I know I would have bought one when I first got interested in building amplifiers.
1st August 2012
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Zen Mod
diyAudio Member
https://www.diyaudio.com/forums/pass-...ml#post3111149
my Papa is smarter than your Nelson !
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24th August 2012
lhgin
Banned
Hi guys,

Where can I purchase the PCB? I don't see it in the DIYAudio store.

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