Pro Audio Design Forum

The last time I worked on that project I was counting spring turns. Several hundred. My daughter was pestering the crap out of me that day and I lost count many, many times. That was 2007. I gave up and it sits on my workbench. The first spring's count measured almost exactly right in the time domai...

Guys -

I'm noticing some issues with getting logged out while trying to submit a post. I'll make this one short.

Ground planes are OK if they don't interfere with the tip/ring and Rgain areas.

I would just use regular 10 uH chokes.

I think that negative peak detector would suffice. However, these circuits both waste an IC "real estate": in the first one it is 1 unused op-amp and in the second it's 1 unused comparator. The last circuit you proposed looks very reasonable. But returning to the first one, I thought that...

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...

Thanks Roger.

JR - It snowed earlier in the month as far south as Houston.

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...

We estimate it's been about 52 years since the last white Christmas...

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.

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...

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