A latch circuit using dicrete components would need two BJTs or two MOSFETs, not just one.I presume a BJT - NPN would work best for this, or would an N - MOSFET be better?
Is this what you are trying to accomplish?As the title states; what would be the most effective way to latch the transistor "closed" using the output from another "always on" sensor - then have it turn back on by biasing the transistor the other way again, using yet another sensor?
Could be the ticket! Thanks; that's super helpful.Is this what you are trying to accomplish?
H1 activates the solenoid and Q1 performs the latch.
H2 is powered through Q2 and resets latch.
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Not sure your meaning but a push button could provide either a negative or positive signal depending on how it's configured.Also, am I right in saying that were the sensors in the diagram momentary push buttons, it'd operate the other way around, seeing as these sensors provide a "negative" signal, or am I mistaken?
Thanks for the help. That clears up a lot of questions I had.Not sure your meaning but a push button could provide either a negative or positive signal depending on how it's configured.
The hall sensors have an open drain FET transistor in their outputs which would be the same as a momentary switch with one side connected to ground providing a negative output.
R1 = 10KAny special consideration for the resistor values? Or just calculate using V=IR as usual?
Awesome, thanks.R1 = 10K
R2 = 100K
Q1 = 2N3904
P- Mosfet required and recommended or PNP transistor. How much current does the solenoid draw?Does it have to be a P MOSFET? Or could I use an N-MOSFET instead but wired the other way round?
Or people know that this is not true. The universe is not in perpetual motion. Per this article, the energy in the universe has gone down by 50% over the past billion years or so, give or take a few million. Read the article.The whole universe is in perpetual motion.. I think people forget this.
by Jake Hertz
by Jake Hertz
by Aaron Carman