Doug Self Preamp from Linear Audio #5

[OZAM]

Carl,
Would you give me more details about the power supply PCB do you offer?
Thanks.

 

[Carl_Huff]

Let's start a group buy list. I'll leave it up until November 1st. Expect delivery to be mid to late November

>>> ------- PAID --------- <<<

georgebrooke - 1 kit + 1 PWR_Supply_PCB - PAID
Halauhula - 1 kit - PAID
jan.didden - 1 kit - PAID
hfxrzw - 2 kits - PAID
PJN - 1 kit - PAID
still4given - 1 kit - PAID
GlennW - 1 kit - PAID
zrxshack - 1 kit - PAID
rock12 - 1 kit - PAID
Somakmaitra - 1 kit - PAID
mik000000 - 1 kit + 1 PWR_Supply_PCB - PAID
AMV8 - 2 kits - PAID
arthur - 2 kits + 2 PWR_Supply_PCBs - PAID
Badge - 1 kit - PAID
OZAM - 2 kits - PAID
emyeuoi - 1 kit + 2 PWR_Supply_PCBs - PAID
misterdog - 1 kit + 2 PWR_Supply_PCBs - PAID
Ian Finch - 1 kit - PAID
Rick G - 1 kit + 1 PWR_Supply_PCB - PAID
forr - 1 kit - PAID
djonessii - 1 kit + 1 PWR_Supply_PCB - PAID
TFW - 1 kit + 1 PWR_Supply_PCB - PAID
Mraudionut - 1 kit + 1 PWR_Supply_PCB - PAID
BillS - 1 kit + 1 PWR_Supply_PCB - PAID

>>> --- PENDING --- <<<

kiroje - 1 kit
canute - 1 kit
MosfetDemon - 1 kit
AMPMAN - 1 kit
orjan - 1 kit
Johnny2Bad - 1 kit
kimon - 1 kit + 1 PWR_Supply_PCB

If you have asked to be added to the list but don't see your name be sure to let me know!

 

[Carl_Huff]

Carl,
Would you give me more details about the power supply PCB do you offer?
Thanks.

It is the +/- 17 volt power supply suggested by Doug Self earlier in this thread. It is from his 'Small Signal Audio Design' book, page #530, Figure 20.3(b). It's a cost effective yet very functional design. I've got the prototype for the PCB run working here. I'll put up some detailed PICs over the weekend.

 

[AMPMAN]

carl I am not sure how to pay you regards ampman

 

[Carl_Huff]

carl I am not sure how to pay you regards ampman

PayPal is the preferred method but if that is a problem, I will work with you. You have a private message.

 

[herb1diaz]

put me in for 2 kits + power supply PCB, need payment info

 

[bfg4wd]

Please add me for one kit plus power supply.

Thanks

 

[OZAM]

Thanks Carl, please add two power supply PCB's to my order.
I just sent the payment.

Thanks again.

 

[Carl_Huff]

Let's start a group buy list. I'll leave it up until November 1st. Expect delivery to be mid to late November

>>> ------- PAID --------- <<<

georgebrooke - 1 kit + 1 PWR_Supply_PCB - PAID
Halauhula - 1 kit - PAID
jan.didden - 1 kit - PAID
hfxrzw - 2 kits - PAID
PJN - 1 kit - PAID
still4given - 1 kit - PAID
GlennW - 1 kit - PAID
zrxshack - 1 kit - PAID
rock12 - 1 kit - PAID
Somakmaitra - 1 kit - PAID
mik000000 - 1 kit + 1 PWR_Supply_PCB - PAID
AMV8 - 2 kits - PAID
arthur - 2 kits + 2 PWR_Supply_PCBs - PAID
Badge - 1 kit - PAID
OZAM - 2 kits + 2 PWR_Supply_PCBs - PAID
emyeuoi - 1 kit + 2 PWR_Supply_PCBs - PAID
misterdog - 1 kit + 2 PWR_Supply_PCBs - PAID
Ian Finch - 1 kit - PAID
Rick G - 1 kit + 1 PWR_Supply_PCB - PAID
forr - 1 kit - PAID
djonessii - 1 kit + 1 PWR_Supply_PCB - PAID
TFW - 1 kit + 1 PWR_Supply_PCB - PAID
Mraudionut - 1 kit + 1 PWR_Supply_PCB - PAID
BillS - 1 kit + 1 PWR_Supply_PCB - PAID

>>> --- PENDING --- <<<

kiroje - 1 kit
canute - 1 kit
MosfetDemon - 1 kit
AMPMAN - 1 kit
orjan - 1 kit
Johnny2Bad - 1 kit
kimon - 1 kit + 1 PWR_Supply_PCB
bfg4wd - 1 kit + 1 PWR_Supply_PCB
herb1diaz - 2 kit + 2 PWR_Supply_PCB

If you have asked to be added to the list but don't see your name be sure to let me know!

 

[Carl_Huff]

Let's start a group buy list. I'll leave it up until November 1st. Expect delivery to be mid to late November

>>> ------- PAID --------- <<<

georgebrooke - 1 kit + 1 PWR_Supply_PCB - PAID
Halauhula - 1 kit - PAID
jan.didden - 1 kit - PAID
hfxrzw - 2 kits - PAID
PJN - 1 kit - PAID
still4given - 1 kit - PAID
GlennW - 1 kit - PAID
zrxshack - 1 kit - PAID
rock12 - 1 kit - PAID
Somakmaitra - 1 kit - PAID
mik000000 - 1 kit + 1 PWR_Supply_PCB - PAID
AMV8 - 2 kits - PAID
arthur - 2 kits + 2 PWR_Supply_PCBs - PAID
Badge - 1 kit - PAID
OZAM - 2 kits + 2 PWR_Supply_PCBs - PAID
emyeuoi - 1 kit + 2 PWR_Supply_PCBs - PAID
misterdog - 1 kit + 2 PWR_Supply_PCBs - PAID
Ian Finch - 1 kit - PAID
Rick G - 1 kit + 1 PWR_Supply_PCB - PAID
forr - 1 kit - PAID
djonessii - 1 kit + 1 PWR_Supply_PCB - PAID
TFW - 1 kit + 1 PWR_Supply_PCB - PAID
Mraudionut - 1 kit + 1 PWR_Supply_PCB - PAID
BillS - 1 kit + 1 PWR_Supply_PCB - PAID
herb1diaz - 2 kit + 2 PWR_Supply_PCB - PAID

>>> --- PENDING --- <<<

kiroje - 1 kit
canute - 1 kit
MosfetDemon - 1 kit
AMPMAN - 1 kit
orjan - 1 kit
Johnny2Bad - 1 kit
kimon - 1 kit + 1 PWR_Supply_PCB
bfg4wd - 1 kit + 1 PWR_Supply_PCB


If you have asked to be added to the list but don't see your name be sure to let me know!

 

[mprivitera1]

As promised here is a PCB and construction thread for the preamplifier as designed by Doug Self and published by Jan Didden in Linear Audio issue #5. Both gentlemen have graciously agreed to offer their support to guarantee success of this thread.

This preamplifier is especially interesting in that it includes what Doug describes as a 'comprehensive tone control', that means that both the gain and frequency hinge points for the HIs and LOs are continuously user adjustable.

For the last month I've been using this preamplifer listening to a variety of music and sources. Now that I have gotten used to having comprehensive tone controls at my fingertips I would miss them immensely if they were to disappear!

Another quality of Doug's creation is that it's quiet, so quiet that I have given up attempting to measure it's noise level with my aging AP Portable One test set. Noise level at the outputs is at or near the noise threshold of my test set.

Assuming there is sufficient interest I will offer up a kit of parts for builders amounting to the required IO and main PCBs, 6 potentiometers, 4 PCB mount RCA phono connectors, BOM and a PDF reprint of the Linear Audio article.

The cost for a 2 channel kit will be $50 plus actual cost to ship.

Here are a couple of quick PICs of what I am describing. I'll work on getting some better and detailed PICs later but these will get the project rolling.

Hello Carl Huff,

I can ask a few;

what kind of sound it has since it's made from OPA only?

What is included in the kit? - PCB and components to be welded?

As cost including shipping in Italy?

Thanks for your patience

 

[vasillis]

count me for 2 kits and 2 psu

 

[fabianosorocaba]

Ola, saberia o custo de envio para Brasil?

 

[Carl_Huff]

Ola, saberia o custo de envio para Brasil?

If I understand what you are asking, "Would I ship to Brazil?", the answer is, "Yes". Check your private messages for details.

 

[Carl_Huff]

Hello Carl Huff,

I can ask a few;

what kind of sound it has since it's made from OPA only?

What is included in the kit? - PCB and components to be welded?

As cost including shipping in Italy?

Thanks for your patience

The project as designed by Douglas Self has LM4562 devices exclusively in the audio path. I personally like the sound of that part. The preamplifier is very quiet and the sound uncolored. I find the tone controls to be especially useable. However the question you ask is very subjective and others might grimace and disagree with me!

The kit amounts to 2 PCBs, the 6 potentiometers and RCA connectors because they are not readily available. You will need to buy another $150 US (approx.) worth of parts to populate those PCBs. I will be supplying a parts BOM to buy those from Mouser.

Please check your Private Messages for more details.

 

[Carl_Huff]

Let's start a group buy list. I'll leave it up until November 1st. Expect delivery to be mid to late November

>>> ------- PAID --------- <<<

georgebrooke - 1 kit + 1 PWR_Supply_PCB - PAID
Halauhula - 1 kit - PAID
jan.didden - 1 kit - PAID
hfxrzw - 2 kits - PAID
PJN - 1 kit + 2 PWR_Supply_PCB - PAID
still4given - 1 kit - PAID
GlennW - 1 kit - PAID
zrxshack - 1 kit - PAID
rock12 - 1 kit - PAID
Somakmaitra - 1 kit - PAID
mik000000 - 1 kit + 1 PWR_Supply_PCB - PAID
AMV8 - 2 kits - PAID
arthur - 2 kits + 2 PWR_Supply_PCBs - PAID
Badge - 1 kit - PAID
OZAM - 2 kits + 2 PWR_Supply_PCBs - PAID
emyeuoi - 1 kit + 2 PWR_Supply_PCBs - PAID
misterdog - 1 kit + 2 PWR_Supply_PCBs - PAID
Ian Finch - 1 kit - PAID
Rick G - 1 kit + 1 PWR_Supply_PCB - PAID
forr - 1 kit - PAID
djonessii - 1 kit + 1 PWR_Supply_PCB - PAID
TFW - 1 kit + 1 PWR_Supply_PCB - PAID
Mraudionut - 1 kit + 1 PWR_Supply_PCB - PAID
BillS - 1 kit + 1 PWR_Supply_PCB - PAID
herb1diaz - 2 kit + 2 PWR_Supply_PCB - PAID
AMPMAN - 1 kit + 1 PWR_Supply_PCB

>>> --- PENDING --- <<<

kiroje - 1 kit
canute - 1 kit
MosfetDemon - 1 kit
orjan - 1 kit
Johnny2Bad - 1 kit
kimon - 1 kit + 1 PWR_Supply_PCB
bfg4wd - 1 kit + 1 PWR_Supply_PCB
vasillis - 2 kit + 2 PWR_Supply_PCB


If you have asked to be added to the list but don't see your name be sure to let me know!

 

[mprivitera1]

The project as designed by Douglas Self has LM4562 devices exclusively in the audio path. I personally like the sound of that part. The preamplifier is very quiet and the sound uncolored. I find the tone controls to be especially useable. However the question you ask is very subjective and others might grimace and disagree with me!

The kit amounts to 2 PCBs, the 6 potentiometers and RCA connectors because they are not readily available. You will need to buy another $150 US (approx.) worth of parts to populate those PCBs. I will be supplying a parts BOM to buy those from Mouser.

Please check your Private Messages for more details.

thank you very very kind!

 

[Carl_Huff]

I am ordering the PCBs and parts this week (1st week of November).

I will have a few extra PCBs for late comers, altho just a few.

** Expect delivery to be mid to late November **

>>> ------- PAID --------- <<<

georgebrooke - 1 kit + 1 PWR_Supply_PCB - PAID
Halauhula - 1 kit - PAID
jan.didden - 1 kit - PAID
hfxrzw - 2 kits - PAID
PJN - 1 kit + 2 PWR_Supply_PCB - PAID
still4given - 1 kit - PAID
GlennW - 1 kit - PAID
zrxshack - 1 kit - PAID
rock12 - 1 kit - PAID
Somakmaitra - 1 kit - PAID
mik000000 - 1 kit + 1 PWR_Supply_PCB - PAID
AMV8 - 2 kits - PAID
arthur - 2 kits + 2 PWR_Supply_PCBs - PAID
Badge - 1 kit - PAID
OZAM - 2 kits + 2 PWR_Supply_PCBs - PAID
emyeuoi - 1 kit + 2 PWR_Supply_PCBs - PAID
misterdog - 1 kit + 2 PWR_Supply_PCBs - PAID
Ian Finch - 1 kit - PAID
Rick G - 1 kit + 1 PWR_Supply_PCB - PAID
forr - 1 kit - PAID
djonessii - 1 kit + 1 PWR_Supply_PCB - PAID
TFW - 1 kit + 1 PWR_Supply_PCB - PAID
Mraudionut - 1 kit + 1 PWR_Supply_PCB - PAID
BillS - 1 kit + 1 PWR_Supply_PCB - PAID
herb1diaz - 2 kit + 2 PWR_Supply_PCB - PAID
AMPMAN - 1 kit + 1 PWR_Supply_PCB - PAID
mlackey - 1 kit + 1 PWR_Supply_PCB - PAID
bfg4wd - 1 kit + 1 PWR_Supply_PCB - PAID
vasillis - 2 kit + 2 PWR_Supply_PCB - PAID

>>> --- PENDING --- <<<

kiroje - 1 kit
canute - 1 kit
MosfetDemon - 1 kit
orjan - 1 kit
Johnny2Bad - 1 kit
kimon - 1 kit + 1 PWR_Supply_PCB
Philipp23 - 1 kit + 1 PWR_Supply_PCB

If you have asked to be added to the list but don't see your name ...

If you have paid and I failed to show that or if I have messed up the description of what you ordered let me know!

 

[rock12]

pay pal is messing up I am trying to send you $10.00 for the power supply save me one please

 

[Carl_Huff]

Group Buy Winding Down

I am ordering the PCBs and parts this week (1st week of November).

I will have a few extra PCBs for late comers, altho just a few.

** Expect delivery to be mid to late November **

>>> ------- PAID --------- <<<

georgebrooke - 1 kit + 1 PWR_Supply_PCB - PAID
Halauhula - 1 kit - PAID
jan.didden - 1 kit - PAID
hfxrzw - 2 kits - PAID
PJN - 1 kit + 2 PWR_Supply_PCB - PAID
still4given - 1 kit - PAID
GlennW - 1 kit - PAID
zrxshack - 1 kit - PAID
rock12 - 1 kit + 1 PWR_Supply_PCB - PAID
Somakmaitra - 1 kit - PAID
mik000000 - 1 kit + 1 PWR_Supply_PCB - PAID
AMV8 - 2 kits - PAID
arthur - 2 kits + 2 PWR_Supply_PCBs - PAID
Badge - 1 kit - PAID
OZAM - 2 kits + 2 PWR_Supply_PCBs - PAID
emyeuoi - 1 kit + 2 PWR_Supply_PCBs - PAID
misterdog - 1 kit + 2 PWR_Supply_PCBs - PAID
Ian Finch - 1 kit - PAID
Rick G - 1 kit + 1 PWR_Supply_PCB - PAID
forr - 1 kit - PAID
djonessii - 1 kit + 1 PWR_Supply_PCB - PAID
TFW - 1 kit + 1 PWR_Supply_PCB - PAID
Mraudionut - 1 kit + 1 PWR_Supply_PCB - PAID
BillS - 1 kit + 1 PWR_Supply_PCB - PAID
herb1diaz - 2 kit + 2 PWR_Supply_PCB - PAID
AMPMAN - 1 kit + 1 PWR_Supply_PCB - PAID
mlackey - 1 kit + 1 PWR_Supply_PCB - PAID
bfg4wd - 1 kit + 1 PWR_Supply_PCB - PAID
vasillis - 2 kit + 2 PWR_Supply_PCB - PAID

>>> --- PENDING --- <<<

kiroje - 1 kit
canute - 1 kit
MosfetDemon - 1 kit
orjan - 1 kit
Johnny2Bad - 1 kit
kimon - 1 kit + 1 PWR_Supply_PCB
Philipp23 - 1 kit + 1 PWR_Supply_PCB

If you have asked to be added to the list but don't see your name ...

If you have paid and I failed to show that or if I have messed up the description of what you ordered let me know!