Hello everyone
I've used chatgpt to help me design a circuit for one led flasher, and it guided me for this attached circuit with connections
But when I simulated on proteus, the led not Turn on, and no flasher action
How can I fix this?

 

I don't know what Q2 does, but Q1 gets a base drive till C1 charges. Then there is no way it can discharge. The schematic is wrong.

This is another simple flasher.

https://images.app.goo.gl/aHvTr3RJg2kP58ys5

 

https://electronics.stackexchange.c...table-multivibrator-led-blinking-circuit-work

This circuit almost always works.
If you want one LED only, just replace one of them with a short circuit.

"super simple" circuits like the one in post #2 are a trap- this requires a very specific transistor and voltage - not at all forgiving.

FYI - Chat GPT is absolutely horrible at circuit design- not useable.

 

I also suggest the same circuit Sensacell proposed. It has been in use since hobbyists started using transistors, in the early 1960s.

And also agree that Chatgpt provides circuit abominations.

 

Try this circuit:

 

I also suggest the same circuit Sensacell proposed. It has been in use since hobbyists started using transistors, in the early 1960s.

. . . and before. This just in from 1919: https://en.wikipedia.org/wiki/Multivibrator

which was a modification of this, from 1918: https://en.wikipedia.org/wiki/Flip-flop_(electronics)#History

ak

 

This is another simple flasher.

Here is the original: http://www.cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.html

ak

 

This simple circuit works on the reverse breakdown voltage of the transistor. It requires 12 V or higher to work.

 

A joule thief will operate from a single AA battery. https://www.instructables.com/Joule-Thief-Circuit-How-to-Make-and-Circuit-Explan/

 

Another ultra simple flasher utilizes the 2N4988 Silicon Unilateral Switch.
The SUS looks like a transistor but belongs to the switching family of devices like Diacs and UJTs.

EDIT: the symbol is not really that of a SUS, but EasyEda didn’t have a ready made symbol.

 

In your circuit, Q2 will (if it does turn on at all) apply full battery voltage (minus Q2's Vf) to D1. D1 will light for a moment when Q1 turns on. You WILL achieve a flashing LED. That is to say it will flash once as it burns out almost instantaneously. ChatGTP isn't always the best for designing circuits. I have never tried it and for some fairly obvious reasons I wouldn't.

 

I did a similar project, worked well: https://forum.allaboutcircuits.com/threads/completed-project-simple-led-flasher.192068/

 

Hello everyone
I've used chatgpt to help me design a circuit for one led flasher, and it guided me for this attached circuit with connections
But when I simulated on proteus, the led not Turn on, and no flasher action
How can I fix this?

Maybe it thought you wanted a one-flash LED, because it gave you a circuit that makes an LED flash once.

 

Maybe it thought you wanted a one-flash LED, because it gave you a circuit that makes an LED flash once.

And never agin will it illuminate. But that assumes Q2 will turn on at all. I don't think 25µA is going to turn Q2 on.

 

Try this circuit:
View attachment 352394

I need 9v voltage source

 

I need 9v voltage source

It will work with 9 V supply. Just increase R3 to set the LED current.

 

Try this circuit:

In your circuit, with 9V battery, in Q1 will breakdown of B-E transition (about 80 mA during every pulse).
I think it is not good.
Instead that TS can to use circuit below.