Search found 5471 matches
- Tue Jan 05, 2010 7:15 pm
- Forum: Pro Audio Design
- Topic: Old: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 212
- Views: 413497
Re: A Direct-Coupled Input-Capacitorless Active Mic Preamp
Thanks Ilya. I think you could use the circuit you posted as-is or with one TL074 section eliminated or this one: https://www.ka-electronics.com/images/jpg/Level_Det_Two_Color.JPG The above gives you off, signal present and clip though it's only negative peak detecting, You could combine the two for...
- Sat Dec 26, 2009 12:02 pm
- Forum: The Peabody Lounge
- Topic: Texas White Chrsitmas
- Replies: 3
- Views: 7428
Re: Texas White Chrsitmas
Thanks Roger.
JR - It snowed earlier in the month as far south as Houston.
JR - It snowed earlier in the month as far south as Houston.
- Sat Dec 26, 2009 6:06 am
- Forum: Pro Audio Design
- Topic: PSU design assistance needed
- Replies: 35
- Views: 52936
Re: PSU design assistance needed
Heres' the LM317/337 regulator board schematic we sold for the Picos. They are no longer available but it may help you out: http://www.proaudiodesignforum.com/PicoComp/PCB-Kits/Documents/PSU/PSU_Documents.htm I had forgotten that there were links to Sam Groener's PSU calculator spreadsheet and to th...
- Fri Dec 25, 2009 8:57 am
- Forum: The Peabody Lounge
- Topic: Texas White Chrsitmas
- Replies: 3
- Views: 7428
Texas White Chrsitmas
We estimate it's been about 52 years since the last white Christmas...
- Thu Dec 24, 2009 11:32 am
- Forum: Pro Audio Design
- Topic: PSU design assistance needed
- Replies: 35
- Views: 52936
Re: PSU design assistance needed
Thanks John! I'm archiving some physical databooks for our member crazynightowl as well. I think I have the VR handbook. Let me see which edition I have...
BTW The National Audio Handbook edition I have is 1977. I think I have an earlier one as well.
BTW The National Audio Handbook edition I have is 1977. I think I have an earlier one as well.
- Thu Dec 24, 2009 7:55 am
- Forum: Pro Audio Design
- Topic: PSU design assistance needed
- Replies: 35
- Views: 52936
Re: PSU design assistance needed
John - The NSC Audio Handbook I have is the series with the dark blue bottom and - IIRC - a tan color bar at the top. Unfortunately the NSC books of that era were printed on newsprint and they haven't aged well. I'm not sure where we discussed the TS-1 but I do have the sch here: http://www.proaudio...
- Wed Dec 23, 2009 7:41 am
- Forum: Pro Audio Design
- Topic: PSU design assistance needed
- Replies: 35
- Views: 52936
Re: PSU design assistance needed
This is a very good reference for you to start with. It should be on everyone's virtual bookshelf:
http://www.proaudiodesignforum.com/imag ... Design.pdf
National Semiconductor Audio Handbook Chapter 6 Power Supply Design
http://www.proaudiodesignforum.com/imag ... Design.pdf
National Semiconductor Audio Handbook Chapter 6 Power Supply Design
- Thu Dec 17, 2009 10:01 am
- Forum: Pro Audio Design
- Topic: Sum bus theory and practice
- Replies: 37
- Views: 55507
Re: Sum bus theory and practice
For now, jump here: viewtopic.php?f=6&t=26&p=101
And here: http://www.ka-electronics.com/Images/pd ... pdf#page=4
JR - What browser do you use? Do the pdf page arguments work in Safari?
And here: http://www.ka-electronics.com/Images/pd ... pdf#page=4
JR - What browser do you use? Do the pdf page arguments work in Safari?
- Thu Dec 17, 2009 4:02 am
- Forum: Pro Audio Design
- Topic: Sum bus theory and practice
- Replies: 37
- Views: 55507
Re: Sum bus theory and practice
Paul - Use a "derived" filter so that they re-combine properly. The old NSC audio handbook has a discussion on that in active speaker crossovers. We should probably start a thread on that.
Wayne
Wayne
- Mon Dec 14, 2009 3:31 pm
- Forum: Pro Audio Design
- Topic: op amp gain; vary Rg or Rf, and why?
- Replies: 28
- Views: 42160
Re: op amp gain; vary Rg or Rf, and why?
An assumption definitaly not to make is to assume that the carbon comp resistors really are the correct value in 2010.
I just threw out a bunch of 5% carbon comps that were off in the 20-30% range. Others from the same period, depending on value manufacturer etc., were spot on.
I just threw out a bunch of 5% carbon comps that were off in the 20-30% range. Others from the same period, depending on value manufacturer etc., were spot on.