Let me just clarify

I want a pushbutton switch to latch on and off with a single press

The schematic In the link i posted above are all the same. The only difference is, when gives a high the other gives a low.

http://www.edn.com/design/power-management/4427218/Latching-power-switch-uses-momentary-pushbutton

Here is my version in the sim. Push the switch and you get no nothing

I have also tried another design from a guy in australia

His came from a youtube video.
Also does not work

 

I wouldn't count on Multisim being able to simulate that circuit. In my experience, it doesn't do anything resembling analog.

Are you set on using discrete components? I have a circuit that was published in Popular Electronics 4 decades ago (IIRC) that uses 3 CMOS inverters; 2 for a latch and one to buffer the output of the latch..

 

I wouldn't count on Multisim being able to simulate that circuit. In my experience, it doesn't do anything resembling analog.

Are you set on using discrete components? I have a circuit that was published in Popular Electronics 4 decades ago (IIRC) that uses 3 CMOS inverters; 2 for a latch and one to buffer the output of the latch..

Hi there

Im set on simple is what I'm set on This thing has to go on a PCB and also have as low power consumption in the off state as possible.

I have had very good luck with multi sim doing pretty much everything i have ever asked it to from designing diff amps to 3 phase circuits. It does have some quarks but is about 500 times easier to use then orcad and i can get a student license for $40 that includes the ultiboard software for building the pcb. It can't get to much better for a student

With all that said, I'm very interested to hear what you got up your sleeve

I do have one design working with a D flip flop

 

I've used this circuit:


EDIT: From Popular Electronics April 1977

 

The circuit from eeblog switches, but the selection of the MOSFET is critical.

 

That is a simple latch, and what you want is a toggle. In terms of circuit reliability, I think your best solution is to let the logic be logic and the power switch be a power switch: the single latch chip from above driving a small P-channel power MOSFET.

ak

Sim, ou talvez ainda um IGBT.

 

Here's a chip, U6032B, that will work.

http://media.digikey.com/pdf/Data Sheets/Atmel PDFs/U6032B.pdf

 

Here's a chip, U6032B, that will work.

http://media.digikey.com/pdf/Data Sheets/Atmel PDFs/U6032B.pdf

That is the way I would like all datasheets to be written.

 

Or you could just use one of these and not use electronics at all.... but what fun is that?
http://www.jpmsupply.com/product-p/70213.htm?gclid=CMC_n_eMncsCFQwPaQoduB0Beg

What am I missing. Whats wrong with the button????
778

 

Buttons work well, but are dull. No fun at all. What is really confusing is that a button must be used to start the electronic version.

 

The ELM411: http://www.elmelectronics.com/DSheets/ELM411DS.pdf

LTC (Various): http://www.linear.com/product/LTC2953

STM (Various): http://www.st.com/web/en/catalog/sense_power/FM1946/SC1753

Maxim https://www.maximintegrated.com/en/...ors-voltage-monitors-sequencers/MAX16054.html

Possibly TI: http://www.ti.com/lit/ds/symlink/tps3420.pdf

 

Nice list. Like the ELM part.

 

The ELM part is basically a programmed PIC, I think.

 

a latch for a pushbutton switch to turn something on and off
as opposed to a slider or toggle switch

The LM555 may still be your answer. You don't have to use it as a monostable or astable.

 

The LM555 may still be your answer. You don't have to use it as a monostable or astable.

AFAIK: The circuit posted by dl324 can be as simple as a single inverter with the capacitor and resistor.