push-push on/off switch

[Jan Panteltje]

Yup. Now, how does one get back to full on/off?

John

Explosives?

 

[Spehro Pefhany]

Probably more than half on.

Yup. Now, how does one get back to full on/off?

John

Change the circuit into a phase-shift oscillator with a couple more
RCs and release the switch when you are happy with the `brightness`.



Best regards,
Spehro Pefhany

 

[John Larkin]

Probably more than half on.


Change the circuit into a phase-shift oscillator with a couple more
RCs and release the switch when you are happy with the `brightness`.

Not necessary. Just tap the switch a few times, and the gate voltage
increasingly seesaws at each tap. In effect, it's already a
phase-shift oscillator.

So it's a single-button controlled push-push switch and dimmer.

SPDT could be even neater.


John

 

[Jim Thompson]

Not necessary. Just tap the switch a few times, and the gate voltage
increasingly seesaws at each tap. In effect, it's already a
phase-shift oscillator.

So it's a single-button controlled push-push switch and dimmer.

SPDT could be even neater.


John

Hold button down until gate and drain voltage at equal.

Release button.

Ignore cooking for the moment ;-)

How do you get out of this state?

...Jim Thompson

 

[John Larkin]

Hold button down until gate and drain voltage at equal.

Release button.

Ignore cooking for the moment ;-)

How do you get out of this state?

...Jim Thompson

I just told you: tap the button a few times.

John

 

[Jim Thompson]

I just told you: tap the button a few times.

John

Nonsense, you're at equilibrium.

...Jim Thompson

 

[John Larkin]

Nonsense, you're at equilibrium.

...Jim Thompson

Well, you're arguing with reality, and reality usually wins.

John

 

[Spehro Pefhany]

Well, you're arguing with reality, and reality usually wins.

John

Any self-heating involved?


Best regards,
Spehro Pefhany

 

[Jim Thompson]

Any self-heating involved?


Best regards,
Spehro Pefhany

I suspect either that or charge injection from the finger through the
switch === reality ?

...Jim Thompson

 

[Rich Grise]

Does everything that's fun have to be useful?

That question evaporates when one realizes that fun is the purpose of
doing it in the first place. ;-)

Cheers!
Rich

 

[Rich Grise]

The enjoyment of brainstorming with a bunch of intelligent and
open-minded folks?

Well, yeah, but that's like a bonus, sort of fun squared! ;-)

Cheers!
Rich

 

[Rich Grise]

I think I've ssen it as an "April's Fool" circuit in Elektor eons ago.

Oh, this works. And does interesting things.[/QUOTE]

"Interesting"? ;-) Ever heard the old Chinese curse:
"May you live in interesting times."? ;-)

Or at the other end of the spectrum, "Hey, make it a feature!"

Cheers!
Rich

 

[John Larkin]

---
Yes, of course, if only to elicit the fun-ness of it through its
utility.

A joke, for instance, is useful to its teller in eliciting laughter
from an audience and sharing in the fun.

But, since you didn't flag your circuit as being a toy and you
generally seem to want your stuff to be considered bulletproof,
why are you surprised that the responses to your post were critical?

If people want to attack ideas instead of playing with them, that's
their choice in life. But I'd advise those people from bidding against
me for anything non-trivial.

And how do you know how I want my "stuff to be considered"?

John

 

[John Larkin]

Less fun, but here's a circuit I just laid out:-

The inverter is microscopic single-gate Schmitt trigger type and the
p-channel MOSFET is half a dual.




Vin
o------+-------+-------+-------+----+
| | | | |
.-. | | | |
R | | | | | |
| | | | S | |
'-' | ||-+ | / ---
| |\ ||-> - ---
+------| >O--||-+ / ^ |
| |/ | D | |
.-. | | | |
R | | | | | |
| | ----------------+----+
'-' | |
| | .-.
| / | | |
- .------. | |
/ ^ | | '-'
| | LOAD | |
| | | |
=== '------' ===
GND | GND
|
|
===
GND




Best regards,
Spehro Pefhany

HV cutout. What's it for?

I love those tiny schmitts. For oscillators, switching regulators,
clock cleanup, debounce. Just don't try making a crystal oscillator
from one.

John

 

[John Larkin]

I suspect either that or charge injection from the finger through the
switch === reality ?

...Jim Thompson

For Pete's sake, it's simple. Think about it.

John

 

[John Fields]

Hold button down until gate and drain voltage at equal.

Release button.

Ignore cooking for the moment ;-)

How do you get out of this state?

 

[John Fields]

On Mon, 22 Oct 2007 09:08:59 -0700, Jim Thompson



Well, you're arguing with reality, and reality usually wins.

 

[Jim Thompson]

That'll work.. or East... just about the same distance ;-)

...Jim Thompson

 

[Spehro Pefhany]

Just put 3 finger-size pads on a PCB with narrow spaces between them.
Middle on goes through 100k or something to the gate. Top and bottom
go to +V and GND. No switch or capacitor required.


Best regards,
Spehro Pefhany

 

[John Fields]

If people want to attack ideas instead of playing with them, that's
their choice in life. But I'd advise those people from bidding against
me for anything non-trivial.