How does a two-transistors LED flasher (flip-flop) circuit work?

  • Thread starter Thread starter zerobigright
  • Start date Start date
  • Tags Tags
    Circuit Led Work
AI Thread Summary
A two-transistor LED flasher circuit operates as a flip-flop, where the transistors alternately switch on and off, causing the LEDs to blink. The timing of the switching is influenced by the charging and discharging of a capacitor, which affects the voltage across the transistors. As one transistor turns on, it allows current to flow through the LED, while the other transistor turns off, preventing current flow through its LED. This cycle continues, creating the flashing effect. Understanding the interplay between the capacitor and transistors is key to grasping how the circuit functions.
zerobigright
Messages
2
Reaction score
0
I don't know when does a capacitors and the transistors switch and turn the other off considering the voltage across them...well, on other words, don't know what makes the LEDs do the flipflop thing...HELP
 
Engineering news on Phys.org
This is a nice little project with a description on how the circuits works:
http://www.talkingelectronics.com/Projects/FlasherCircuits/Page83FlasherCircuitsP1.html
 
Last edited by a moderator:
Thanks, this really helps.
 

Thread '3-terminal device external modeling'

Very basic question. Consider a 3-terminal device with terminals say A,B,C. Kirchhoff Current Law (KCL) and Kirchhoff Voltage Law (KVL) establish two relationships between the 3 currents entering the terminals and the 3 terminal's voltage pairs respectively. So we have 2 equations in 6 unknowns. To proceed further we need two more (independent) equations in order to solve the circuit the 3-terminal device is connected to (basically one treats such a device as an unbalanced two-port...
View full post »
Thread 'Weird near-field phenomenon I get in my EM simulation'

Thread 'Weird near-field phenomenon I get in my EM simulation'

I recently made a basic simulation of wire antennas and I am not sure if the near field in my simulation is modeled correctly. One of the things that worry me is the fact that sometimes I see in my simulation "movements" in the near field that seems to be faster than the speed of wave propagation I defined (the speed of light in the simulation). Specifically I see "nodes" of low amplitude in the E field that are quickly "emitted" from the antenna and then slow down as they approach the far...
View full post »

Similar threads

Basic Circuit: Why don't these two LEDs light up?
Replies
9
Views
2K
Calculating Values for PN2222A LED Circuit
Replies
5
Views
3K
Charlieplexing: LEDs have different brightness
Replies
14
Views
2K
Relay and Capacitor circuit - blinking LED
Replies
26
Views
6K
Beginner circuits / ↓ the voltage & ↑ the efficiency
Replies
12
Views
2K
Calculating LED Requirements for Reuse for Scientists
Replies
15
Views
2K
Simulation of transistor switch circuit
Replies
5
Views
3K
Is My Thyristor Gate Driver Circuit Malfunctioning Due to Component Issues?
Replies
12
Views
2K
Improving Transistor Switching for High Voltage Protection Circuits
Replies
18
Views
9K
I don't understand transistors in combinations .... Or maybe basics ....
2
Replies
68
Views
6K

Hot Threads

Recent Insights

Back
Top