Amp Camp Amp #1 - Page 2

20th June 2012, 08:02 AM
Nelson Pass The one and only Join Date: Mar 2001	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... Click here to read the entire article 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

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. I´ve 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

Blog post at Make is up.

Check it out here

Today you can even spot N-Brock on the home page

25th July 2012

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.

3D Printing Supplies, need something printed?
Google+

1st August 2012