Using Pin 4 of a 555

230

03:23:32

If the reset pin 4 of any 555 drops below 700mV then that 555 no longer performs any task whilst in that state. The task in this circuit is to rapidly flash an LED using a typical astable setup. Connecting pin 4 to Vcc  is often used just to keep it above 700mV out of the way, but it can be used for all sorts of things eg in this circuit....turn the variable resistor just below 700mV seen on pin 4 wire and see the LED stop. Then carefully move the variable resistor above 700mV and see the LED come on. Knowing this enables you to design your circuits using pin 4 as a switch. Take a look at my ' Thermistor fridge cold ' circuit where pin 4 wire is used as a thermistor...you could use it for an LDR light dark switch as part of your circuit etc.

published 10 years ago

hurz

10 years ago

Yes, its called RESET pin http://everycircuit.com/circuit/5539141819826176

kiani

6 years ago

Exposing proff. Charlatan fake proff. http://everycircuit.com/circuit/5308033291517952

kiani

6 years ago

http://everycircuit.com/circuit/5308033291517952

kiani

6 years ago

http://everycircuit.com/circuit/6594477488340992

kiani

6 years ago

Here is the same Nmos that we were looking at in my previous professor waffle: IRF510 from International Rectifier datasheet. Now, it's true that I know nothing about these devices. I haven't used them and I am not aware that they were employed to switch indicators on vehicles. I also have no idea about the uses that electronic design engineering has put them to over the years; includes audio amplifiers, and even 50 MHz 500 watt push pull load sharing amplifier design. Datasheet test details: Prof(on) = 0.03 Ohm Vgfuck = 10 volts VTO = 1 volt but more like 3 Id = 7.3 amp or more In EC here on the left we can see that in this setup: Vds = 0.359 volts Id = 1.2 amp And…this will do nothing for an accurate simulation! So, WTF have I been on about all these years?

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