Search found 2930 matches

by mediatechnology
Tue Apr 24, 2018 4:46 pm
Forum: Pro Audio Design
Topic: Dielectric Absorption
Replies: 32
Views: 4205

Re: Dielectric Absorption

The 47µF electrolytic measures about 1.45 V today.

The 47µF film reads 10.6 mV.
by mediatechnology
Tue Apr 24, 2018 12:20 pm
Forum: Build
Topic: Meanwell Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
Replies: 17
Views: 1798

Re: Meanwell Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects

The TI ripple eater regulators I was thinking about are the TPS7AXX-series:

TPS7A47 Positive: http://www.ti.com/product/TPS7A47
TPS7A33 Negative: http://www.ti.com/product/TPS7A33
by mediatechnology
Tue Apr 24, 2018 10:20 am
Forum: The Peabody Lounge
Topic: Entropy
Replies: 453
Views: 193686

Re: Entropy

Electrolytic capacitors seem to be the weak link in everything - maybe even dehumidifiers. Knock on wood my daily-crashing Win XP machine has run since Friday the 13th without a reboot. The 6 out of 10 bad electrolytics I replaced brought it back to its old reliable self of running months without a ...
by mediatechnology
Sat Apr 21, 2018 2:05 pm
Forum: Build
Topic: Meanwell Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
Replies: 17
Views: 1798

Re: Meanwell Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects

I think TI makes one.

I also have design Idea Ripple Eater that was published recently.
by mediatechnology
Sat Apr 21, 2018 7:26 am
Forum: The Peabody Lounge
Topic: RIP Frances Lloyd
Replies: 4
Views: 439

Re: RIP Frances Lloyd

Metrology is a cool interdisciplinary science. I've been kind of fascinated with it since I learned of its existence. Measuring things seems like it should be easy but it is anything but. Me too. Some of you might find this article interesting: What’s All This Reference Stuff, Anyhow? http://www.el...
by mediatechnology
Fri Apr 20, 2018 1:05 pm
Forum: Build
Topic: Meanwell Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
Replies: 17
Views: 1798

Meanwell RS-25-48 48V 0.57A Phantom Supply

The Meanwell RS-25-48 48V (adjustable) 0.57A switcher, when used with a simple RC post-filter, is suitable for phantom power. Mouser Product Page: https://www.mouser.com/productdetail/mean-well/rs-25-48?qs=pqZ7J9Gt%2FmrIFMxOZ%2FxiXg%3D%3D Meanwell PS-25-48 Datasheet http://meanwellusa.com/productPd...
by mediatechnology
Thu Apr 19, 2018 5:12 pm
Forum: Document
Topic: Bootstrapped Op Amp Articles
Replies: 31
Views: 18487

Re: Bootstrapped Op Amp Articles

I happened to be looking at the dBx 160 output stage today and happened to notice that its op amp supply rails appear to be voltage-bootstrapped by a tap on the output stage bias divider string. I saved this schematic years ago as an example of a ground-compensating output. Never noticed the mild b...
by mediatechnology
Thu Apr 19, 2018 4:21 pm
Forum: Pro Audio Design
Topic: Dielectric Absorption
Replies: 32
Views: 4205

Re: Dielectric Absorption

I charged the Dayton 47µF polypropylene film cap (shown below) to 30V and then shorted it with a clip lead for about 30 seconds. After a few hours of recovery I measured it to have "rebounded" to only 8 mV. That was a few days ago. Today its still around 8 mV. Low dielectric absorption and low leaka...
by mediatechnology
Thu Apr 19, 2018 1:33 pm
Forum: Build
Topic: Linear Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
Replies: 0
Views: 42

Linear Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects

Bel Power has open frame linear supplies that are ideal for audio projects. Bel Power Open Frame Linear Power Supply Datasheet: https://belfuse.com/resources/datasheets/powersolutions/ds-bps-linear-series.pdf https://media.digikey.com/Photos/Power-One%20Photos/LINEAR-123.JPG A +/-15V 400 mA supply,...
by mediatechnology
Tue Apr 17, 2018 9:19 pm
Forum: Document
Topic: Circuit Collection of Design Ideas from Electronics and EDN
Replies: 14
Views: 4952

Re: Circuit Collection of Design Ideas from Electronics and EDN

I think the requirement also included actuation via a pushbutton switch or momentary pulse.