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Mains voltage zero crossing detector with optical isolated output

I call it "too clever for a Master Circuit Designer to understand."

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John Larkin, President       Highland Technology Inc
www.highlandtechnology.com   jlarkin at highlandtechnology dot com   

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Reply to
John Larkin
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Cute. There are probably other ways to use the phototransistors. After all, they are transistors, so shouldn't be wasted. How about making an optically commutated flipflop?

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John Larkin, President       Highland Technology Inc
www.highlandtechnology.com   jlarkin at highlandtechnology dot com   

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME  analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
Reply to
John Larkin

Like I said, "brainless hip shot". Possibly good concept, but Larkinesque... doesn't hit CMOS threshold sufficiently, because it wasn't actually checked for good values... if any such values exist.

But your idea to get away from the totem (I presume) and drive an R-S flop would work sharply. ...Jim Thompson

--
| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
             
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

All the values are in plain sight, you moron.

You are automatically hostile to ideas. Especially ones that are not yours. Extra-especially ideas you don't understand.

--

John Larkin, President       Highland Technology Inc
www.highlandtechnology.com   jlarkin at highlandtechnology dot com   

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME  analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
Reply to
John Larkin

Try with the caps c-b instead of c-e, 56 pF maybe. Use those transistors!

--

John Larkin, President       Highland Technology Inc
www.highlandtechnology.com   jlarkin at highlandtechnology dot com   

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME  analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
Reply to
John Larkin

Or separate the phototransistors, ground the emitters, add weak pullups, and go into two uP port pins. The pullups may be free inside the uP.

But not as cute as the totem pole.

--

John Larkin, President       Highland Technology Inc
www.highlandtechnology.com   jlarkin at highlandtechnology dot com   

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME  analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
Reply to
John Larkin

Indeed! And they don't meet a sufficient excursion to properly trip a CMOS gate, or inverter, or what ever... I checked it. Indeed a clever idea, but it doesn't quite work.

What? You are offended that I think your idea of driving a flip-flop has possibilities? You're the moron. Why are you so full of hate? ...Jim Thompson

--
| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
             
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

1978? That's fairly recent. My first disco lighting is from when the LM324 wasn't available yet. 
--
Regards, Joerg

http://www.analogconsultants.com/
Reply to
Joerg

Post your schematic ;-) ...Jim Thompson

--
| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
             
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

All 300 feet of it!

--
You can't have a sense of humor, if you have no sense.
Reply to
Michael A. Terrell

That would require major digging. I always had a habit of properly documenting my stuff even as a kid, and have some really archaic ones. Somewhere. Like this circuit that was used to muffle the "wrist-whack" you got when turning on an industrial angle grinder, depeloped by yours truly:

formatting link

Pre-1975 stuff is partially gone though, on account of a move across a large pond. I am pretty sure I chucked the disco-light module.

--
Regards, Joerg

http://www.analogconsultants.com/
Reply to
Joerg

I think I have pretty much everything I've ever done... mostly due to a technician/secretary named Jim Foster who documented everything I ever doodled.

Unfortunately it's somewhere in five 4-drawer cabinets and isn't indexed :-( But at least everything is in a labeled folder.

That's the stuff prior to around 1985, when I went CAD. Most of that CAD stuff has been copied off of floppies onto CD's ...Jim Thompson

--
| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
             
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

I'd still have to do that. Although the usefulness would be rather limited. For example, the IC in the link above has become unobtanium long since. Same for all those Ge-transistors in my youth projects.

--
Regards, Joerg

http://www.analogconsultants.com/
Reply to
Joerg

[snip]

And I say it doesn't work. Show us that it does (without fudging values :-) ...Jim Thompson

--
| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
             
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

It gets down to about 1.2 volts out of 5, 0.24 of Vcc, good enough. A minor tweak gets it down to about 0.8.

--

John Larkin, President
Highland Technology, Inc

jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro   acquisition and simulation
Reply to
John Larkin

Show us the full simulation setup, or breadboard, whichever way you "proved" it. My PSpice sim shows it barely drops 2.5V, quite marginal to drive CMOS reliably.

And show us that "minor tweak". ...Jim Thompson

--
| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
             
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

until

Oh, drop dead, you tiresome old hag.

--

John Larkin, President
Highland Technology, Inc

jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro   acquisition and simulation
Reply to
John Larkin

until

Now that wasn't nice! ;)

Jamie

Reply to
Jamie

until

is

Accuracy comes first.

--

John Larkin, President       Highland Technology Inc
www.highlandtechnology.com   jlarkin at highlandtechnology dot com   

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME  analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
Reply to
John Larkin

until

is

Your usual response when you really have no solution.

You can't prove you're right, because the @#$%ing circuit, while an amusing concept, falls apart in real life.

You tiresome old moron. ...Jim Thompson

--
| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
             
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

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