Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Yeah, I understand that now. I was a bit confused because there was no sepperate trigger wave.
What about the second circuit?
Since there is no constant current source will the 555 work at all. I'm confused. The cap won't be charged properly it seems and the op amp at the bottom will amplify...
**broken link removed**
Can someone please help me understand how these work.
In the first one the diode zener and 100k create a voltage of 3.3v. The voltage on the the 200ohm resistor is 3.3-0.7v (0.7v -voltage on the transistor)
Ie=Ic so that the elec current on the capasitor is...
okay, one more tiny question. How do I find the equivelent of logic 1 and 0 in volts? is it just 0v-7.5v =>0 and 7.5v-15v =>1 or what? cause I need to find how much time the condenser takes to be charged until leg12=1.
Thanks for all the help!!! :D
Oh and is there a power-on delay because...
so do the graphs I dis seem right to you?
Just a few more things and I'll understand this thing completely!
On the 3 NOR what happens to the paralell capasitor and resistor. I now when the second switch is closed it should be 1 but how does that happen.
After that, between the third and...
Half of the parts are there to make the whole thing more confusing. The same reasult could be achieved with fewer parts. It's just that my teacher wanted to include everything we were studying. Frankly, I see no reason for the 741 at all, it seems to be an overly large switch. It serves no...
Zainny, acctually first when the switch is closed -in becomes 0 therefore smaller than +in(max 3.7v) and out is 15v and when switch is open the cap is charged, once it reaches over 3.7v out becomes 0v and when the switch is closed again the cap discharged and once it's lower than 3.7v again the...
What happens with the condenser and tthe parallel resistor and diode. I don't get when the second 555 is triggered. Can out be more than 15v on the first 555(impossible right?). So when output is 15v and vcc is 15v what happens to the diode? and also I never studied the 4001 what do I consider...
I did a quick search on google and found this:
**broken link removed**
I'me not sure if it's the right thing or not, I didn't really look into it but from what I read it's voice recognition system and there is a link to a schematic towards the end.
Please?...I'm desperate for help
Or maybe someone could recommend some sites on the net explaining this type of stuff with examples or recommend another forum which is more active than this one, because there don't seem to be many people using this one with an average of 3 registered users...
Okay thanks!!! :D
Now for the next part!
When outage is -vcc on the comparoror, the 555 creates a delay determaned by (Ra+Rb) and C right? t=1.1*C*Rab, afterwards what happens with the second 555 timer?
Sorry for so many questions :oops:
why isn't the 0.1uF charged when the swith is closed?
Is it as if the 0.1uF doesn't exist and the resistor get the full voltage and nothing is left for -in
Could someone please explain more about how the 741 comparor works.
With calculations? Cause I can't seem to understand it. It seems that when the switch is closed vout=+vcc(15v) and when it's open it's -vcc(0v), why? Please help me understand!
Vth=3.7v
Vtl=0v
Also could someone recommend a...
Like the subject says I'm a complete novice when it comes to electronics and I found this forum while searching for somewhere to ask for help. If somebody doesn't mind taking some time to help me, could you please help me whith this circuit that I'm supposed to build(for highshool) and explain...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
