Pro Audio Design Forum

Pete -

What are the gold thingy's, mute switches?

Wayne

Thanks for sending this Pete! NIce build. Thanks for taking the measurements.

Wayne

John -

That's a nice circuit. I started liking it from R26 and R27 onward. It's not often you see series resistors to limit ripple current but the capacitors sure appreciate it.

Wayne

I keep waiting for them to go through my garage.

"You know you're old when you're pictured in Archaeology magazine," chuckled Olompali-Barton, now 58, who was profiled in that journal in July along with California State Parks archaeologist E. Breck Parkman.

http://www.montereyherald.com/ci_13290049

Steve -

Have the smoke levels dropped down some since your last report? How close did it wind up getting to you? Your photo only looked to be a couple of miles.

Wayne

Thanks Holger and Paul. We will be operating the forum for support for an indefinite time and I, and hopefully others, will continue to post new ideas here as well as documents for older semiconductors and pro-audio equipment. The MS matrix and bruno2000's upcoming mic preamp serve as an example of ...

Thanks John! Was that a Popular Electronics or TAA schematic?

I could scratch something up this weekend if there is interest, but probably not worth it for a one off.

Particularly since we all have extra power amps laying around. I think the ratio of amp channels to speakers here is at least 5 to 1.

Just had an idea. Take this current booster circuit with a 1646 (shown below) and make it a swinging op amp by voltage bootstrapping the rails as in the MCI drawing: https://www.ka-electronics.com/images/jpg/THAT1646_Current_Boost.JPG This gives you lots of output current, the bootstrap transistors ...