From post #11.
Not able to breadboard to confirm but values are in the ballpark.

 

How many leds?
What is the Vcc for the circuit?

3 leds and 3.3v supply from coin cells

 

You can use an Arduino/microcontroller+button+LED.

 

3 leds and 3.3v supply from coin cells

Maybe 555 ic is a good solution

Look here
https://www.electronics-tutorials.ws/waveforms/555_timer.html

 

From post #11.
Not able to breadboard to confirm but values are in the ballpark.
View attachment 326189

That circuit will give a very long duty-cycle (the output will be low for just the short time it takes the DIS pin to discharge the capacitor).
You need another resistor in the timing loop to get a lower duty-cycle, as needed to blink an LED.

 

3 leds and 3.3v supply from coin cells

You have to use a LMC555 because the bipolar version is only guaranteed to operate down to about 4.5V. With 3 LEDs, you need to operate them in parallel, each with their own resistor.

If the LEDs are blue or white, you might not be able to get as much brightness as you want.

 

3 leds and 3.3v supply from coin cells

How many cells?
What are the colors of the LEDs?

 

That circuit will give a very long duty-cycle (the output will be low for just the short time it takes the DIS pin to discharge the capacitor).
You need another resistor in the timing loop to get a lower duty-cycle, as needed to blink an LED.

Why do you say that, the timing is the same through R2. I verified that the circuit works just fine.

 

(the output will be low for just the short time it takes the DIS pin to discharge the capacitor).

The DIS pin is not used or shown connected in the #21 schematic you quoted.

ak

 

Why do you say that, the timing is the same through R2. I verified that the circuit works just fine.

You are correct.
I misread how the 555 was connected.

 

From post #11.
Not able to breadboard to confirm but values are in the ballpark.
View attachment 326189

Why do you say that, the timing is the same through R2. I verified that the circuit works just fine.

My sim indicates C1 needs to be a higher value (about 27µF) for 5 seconds on-time.
Did you verify the value when you did the test?

 

My sim indicates C1 needs to be a higher value (about 27µF) for 5 seconds on-time.
Did you verify the value when you did the test?

I did not verify as I'm currently out of town but I believe your sim is accurate.

 

Note that the CMOS 555 cannot source very much current when running on low voltages. The datasheet suggests 2 mA when running on 5 V, and less than that at 3 V.

Consider the 74132 Schmitt trigger NAND gate. In the single-gate logic family (SN74LVC1G132), it has exceptional output current capabilities. Because it can source the LED current directly even when running on 3 V, a single gate can be the entire circuit. The parts and functions are the same as in #21, but with a smaller, cheaper IC.

Schematic later.

ak

https://www.ti.com/product/SN74LVC1...u0FrQxWig5yok8Gf6nGLSjB3Iot7Z3AVq7B6Ox81bZHrF

 

There was one member here that wanted help extending the range of 3 banks of L:ED's , in order to fade in and out each bank in rotation over a certain time on a continuous basic.
I used a 8pin PicMicro with PWM control for each bank with an internal timer, worked like a charm, not that many components.

 

I have made this circuit in multisim. it works perfect but when I try it on breadboard, reset pin is not working, circuit continuously blinking even I cut off reset pin.
need help

 

I have made this circuit in multisim. it works perfect but when I try it on breadboard, reset pin is not working, circuit continuously blinking even I cut off reset pin.
need help

The 555-timer RESET pin (pin-4) is connected to the wrong side of the switch.