diyAudio

diyAudio (https://www.diyaudio.com/forums/index.php)
-   Analog Line Level (https://www.diyaudio.com/forums/analog-line-level/)
-   -   Doug Self Preamp from Linear Audio #5 (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a.html)

rsavas 20th October 2015 02:01 PM

Hi Carl,

LM4562 obsolescence is new to me, so I checked TI web site to see for myself. It lists LM4562 as still being active. Wonder where you got your information from?
I found my information at,
LM4562 | Audio Operational Amplifier | Operational Amplifier (Op Amp) | Description & parametrics

LME49720 is also listed as active. I do see that they do not mention pdip-8 in the pin/pkg lists but the data sheets still show dip-8 as being available.

Usually if they intend to drop a part they at least say not recommended for new design. TI is better than most when it comes to obs parts. Some give you almost no notice at all, like Maxim etc.

rsavas 20th October 2015 02:54 PM

Now that i look further, I see all the TI discontinuance/EOL notices of many National parts. It is a shame, but we all know that these BIG companies do not rely on the DIY community as their source of income. DIP packages are a thing of the past, so I suggest to not design with them any more.

mik000000 20th October 2015 03:43 PM

1 Attachment(s)
Quote:

Originally Posted by Carl_Huff (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a-post4470194.html#post4470194)
How many inputs are you looking for George?

looks like this will do 6...

https://chipamp.com/product/selector-switch-pcb/#

georgebrooke 20th October 2015 03:53 PM

Input Selector
 
Quote:

Originally Posted by mik000000 (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a-post4489789.html#post4489789)

Carl has said (in Post #66) that he plans a drop-in board with multi-inputs. I plan to wait for this, if possible, and to get the basic system working before deciding on the final chassis and front-panel. Right now, in addition to the basic board with its controls, there would be the need to add an on/off (if required), a selector control, a (possible) selector-indicator. All of this on the RHS, where a PS might be fitted.

Carl_Huff 20th October 2015 04:23 PM

Quote:

Originally Posted by georgebrooke (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a-post4489396.html#post4489396)
So, is there any reason, apart from jumping the gun, that we should not just use the Elektor / Self PCB for the +/- 17 VDC power supply?

It would seem to fit the bill, is available, proven, and is designed by the guy that designed the preamp. So we can blame him if it all goes bang :-)

Hello George, No reason not to if that is what you want to do.

However note the power supply as published in the Elektor article does not fit in a 1U chassis. I've got a version of the power supply recommended by Doug Self as published on page 530 of his 'Small Signal Audio Design' book in the works that does fit a 1U chassis. The PCBs for it are in fab as I write this. I will make those available once I've proven the layout. They will cost $10 apiece and be available in a couple of weeks.

georgebrooke 20th October 2015 04:37 PM

Thanks
 
Quote:

Originally Posted by Carl_Huff (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a-post4489830.html#post4489830)
Hello George, No reason not to if that is what you want to do.

However note the power supply as published in the Elektor article does not fit in a 1U chassis. I've got a version of the power supply recommended by Doug Self as published on page 530 of his 'Small Signal Audio Design' book in the works that does fit a 1U chassis. The PCBs for it are in fab as I write this. I will make those available once I've proven the layout. They will cost $10 apiece and be available in a couple of weeks.

Hi Carl,

You just saved me $20 for the pcb alone from Elektor. I am all for a slim design. Put me down for a PS pcb and also for any other boards (like the input board) too, if you are taking orders. Right now I have to get back to installing a bathroom :-(

Carl_Huff 20th October 2015 04:42 PM

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

georgebrooke - 1kit - PAID
Halauhula - 1 kit - PAID
jan.didden - 1 kit - PAID
hfxrzw - 2 kits - PAID
PJN - 1 kit
kiroje - 1 kit
still4given - 1kit - PAID
GlennW - 1kit - PAID
erik777 - 1 kit
arthur - 1 kit
zrxshack - 1 kit - PAID
rock12 - 1 kit
canute - 1 kit
Somakmaitra - 1 kit - PAID
MosfetDemon - 1 kit
mik000000 - 1 kit - PAID
AMV8 - 2 kits
arthur - 2 kits - PAID
Badge - 1 kit - PAID
AMPMAN - 1 kit
orjan - 1 kit
OZAM - 2 kits
emyeuoi - 1 kit - PAID
misterdog - 1 kit
Ian Finch - 1 kit

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

Rick G 20th October 2015 05:09 PM

Carl,
I am in for 1 kit

Carl_Huff 20th October 2015 05:19 PM

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

georgebrooke - 1kit - PAID
Halauhula - 1 kit - PAID
jan.didden - 1 kit - PAID
hfxrzw - 2 kits - PAID
PJN - 1 kit
kiroje - 1 kit
still4given - 1kit - PAID
GlennW - 1kit - PAID
erik777 - 1 kit
arthur - 1 kit
zrxshack - 1 kit - PAID
rock12 - 1 kit
canute - 1 kit
Somakmaitra - 1 kit - PAID
MosfetDemon - 1 kit
mik000000 - 1 kit - PAID
AMV8 - 2 kits
arthur - 2 kits - PAID
Badge - 1 kit - PAID
AMPMAN - 1 kit
orjan - 1 kit
OZAM - 2 kits
emyeuoi - 1 kit - PAID
misterdog - 1 kit
Ian Finch - 1 kit
Rick G - 1 kit

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

Carl_Huff 20th October 2015 07:04 PM

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

georgebrooke - 1kit - PAID
Halauhula - 1 kit - PAID
jan.didden - 1 kit - PAID
hfxrzw - 2 kits - PAID
PJN - 1 kit
kiroje - 1 kit
still4given - 1kit - PAID
GlennW - 1kit - PAID
erik777 - 1 kit
zrxshack - 1 kit - PAID
rock12 - 1 kit
canute - 1 kit
Somakmaitra - 1 kit - PAID
MosfetDemon - 1 kit
mik000000 - 1 kit - PAID
AMV8 - 2 kits
arthur - 2 kits - PAID
Badge - 1 kit - PAID
AMPMAN - 1 kit
orjan - 1 kit
OZAM - 2 kits - PAID
emyeuoi - 1 kit - PAID
misterdog - 1 kit
Ian Finch - 1 kit
Rick G - 1 kit

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


All times are GMT. The time now is 09:23 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 17.65%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio

Wiki