Tagged Questions

-3
votes
1answer
111 views

having problem in creating 555 oscillator in breadboard [closed]

i am quite new in electronics department and so have a very little knowledge about it...ok so i am going to set up a 555 oscillator.....i have the 555 timer chip, a solderless breadboard and resistors ...
4
votes
1answer
490 views

Difference between NE555P and 555CN?

I'm working on a circuit that uses two 555 timers. At the electronics store, they gave me a handful of 555 chips, I only noticed the difference when I finished my circuit: the R1 value is shorted out, ...
3
votes
3answers
1k views

Determine suitable resistor for the base of transistor as switch (NPN)

I have designed a program to count the frequency and time period of the pulse generated by a 555 timer IC using PC Parallel port. I’ve connected a base of BC547 (NPN) transistor to the output pin (no. ...
3
votes
2answers
478 views

What is the job of the capacitor in a 555 circuit?

Let's say you've got a standard astable multivibrator (AMV) 555 circuit that includes all the wiring, two resistors (R1, R2) and a capacitor (C1). I wonder what is the purpose of the capacitor and how ...