Re: Genocide Joe is beginning to stink like Lyndon B. Johnson

On Thu, 9 May 2024 12:02:53 -0400, bitrex <user@example.net> wrote:

On 5/9/2024 11:33 AM, John Larkin wrote:

On Thu, 9 May 2024 11:09:26 -0400, bitrex <user@example.net> wrote:
 

On 5/9/2024 10:06 AM, John Larkin wrote:

On Wed, 8 May 2024 23:35:28 -0400, bitrex <user@example.net> wrote:
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On 5/8/2024 10:04 PM, John Larkin wrote:

On Wed, 8 May 2024 19:40:49 -0400, bitrex <user@example.net> wrote:
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On 5/8/2024 6:32 PM, john larkin wrote:

On Wed, 8 May 2024 17:15:27 -0400, bitrex <user@example.net> wrote:
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On 5/8/2024 10:28 AM, John Larkin wrote:
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Jill Biden reportedly told her husband some time ago to “Stop it, Joe,
stop it now.” Good advice that he continues to ignore — at his peril,
and ours.
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https://mondoweiss.net/2024/05/genocide-joe-is-beginning-to-stink-like-lyndon-b-johnson/
>

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What's your favorite SiC mosfet?
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Why no buy WOLFSPEED:
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<https://www.mouser.com/ProductDetail/Wolfspeed/C3M0280090D?qs=nxZbHzLpdvfcUe1hs5VeOQ%3D%3D>

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What's wrong with that one?
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I've used C2M0280120D and it works fine. Gate drive is a nuisance, but
that's true for all pure SiC parts.
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Ope, I meant to write "why not buy...", it looked like a nice part. More
standoff voltage than I'm accustomed to requiring for most projects,
though.
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I may have a need to roll my own hysteric synchronous buck soon, at an
astounding 12V..
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That's not SiC territory. Possibly GaN if you want a tiny MHz
switcher.
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SiC has amazingly low capacitances compared to high-voltage silicon.
But the gates have to swing to levels like +15 and -5. Fast.
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Why design a switcher, unless it's for fun. You can get a whole 2-amp
buck switcher, great internal reference, current and thermal limited,
spread spectrum, for 19 cents.

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Indeed there's lots of stuff off the shelf but for the application I
have in mind the it's is acting more like a low frequency
self-oscillating Class D, tracking a control voltage.

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I have two current designs where I muck the feedback node of a
spread-spectrum switcher chip to use it as either a programmable power
supply, or an amplifier.
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The simple one powers about 130 12-volt relays. We run them at 12
volts whenever we reprogram them, and after a few milliseconds drop
down to 8 volts to save power.
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Eventually some damned IC jock intgrates our fun circuits.

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It's the future now, we can design our own mixed-signal ICs at the local
Starbucks, the IC jocks don't have to have all the fun.
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<https://www.renesas.com/us/en/document/dst/slg46140-datasheet>
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And I can integrate some other functions, too. Look at all the fun parts
you get for 40 cents in small quantity. These things have been solid
money-makers for me so far
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People keep re-inventing the "analog FPGA" but none seem to AFbeen
successful. There must be some deep fundamental reason why.

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Inertia? Have to use your brain?
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OTP on a leadless package isn't appealing.
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A fierce uP with flash memory and some ADC and DAC channels is more
useful.

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There aren't a lot of fierce uPs at the price, not ones with
well-documented tookits and APIs in English, anyway.
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RP2040.

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80 cents in 500s is definitely nice, certainly gives many 8 bitters a
run for their money
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The dual 130 MHz ARM cpu's are cool. One can do the slow interface
stuff and one can scream bare-metal. The timers and hardware state
machines are slick too.

I was concerned about the floating-point speed, so we tested one. The
basic operations take average about 600 ns, which is OK for us.

It will make a 7 ns pulse on a port pin, with c raising and dropping
the pin in the most obvious way.