Planing to make a led flasher circuit out of NE555 ,
My question is,is it possible to make the circuit work on a 14volt , 0.5 amp transformer.
Do i need to change the POT or any other components .
Any help will be deeply appreciated.

 

The device is only able to operate with a DC voltage. You will need to rectify and filter the transformer output (unless it's a DC wall transformer).

 

The device is only able to operate with a DC voltage. You will need to rectify and filter the transformer output (unless it's a DC wall transformer).

Ofcourse , i am using a rectifier chip , like the one shown below .i have etched a special place to solder the same on the PCB.

 

i have almost finished etching , will clean the pcb & solder components with in 5 mins , will keep updated .

 

DONE !
finished making the circuit ,
seems something is wrong ,
The circuit seems to work fine (Led Blinking) on a 12v .5amp wall DC adapter.
but doesnt seem to be working (led not blinking , just steadily lit) on the transformer (14v .5amp) .
Note: I have used the rectifier but not used a filter (since i dont have a capacitor wth me now) , can that be the problem ?

 

The circuit will not work without the capacitor.

If you are using a 14VAC transformer, you must also use a voltage regulator after the filter capacitor, or you will quickly burn out your 555 timer.

I will guess that you will have about 19v to 24v on the filter capacitor, which is over the limit for your timer.

 

Hello,

Without the buffer capacitor the DC voltage afther the rectifier will be pulsed.
The 555 is every time starting again.
You say you want to use a 14 Volts transformer.
Use a 1000 uF / 35 Volts capacitor as a buffer.
The rectified and buffered voltage will be about 1.4 X higher, so 14 X 1.4 is about 20 Volts.
The maximum voltage for a 555 is about 15 Volts.
You could use a LM7812 to stabelize the volatege back to 12 Volts.

Greetings,
Bertus

 

Hello,

Without the buffer capacitor the DC voltage afther the rectifier will be pulsed.
The 555 is every time starting again.
You say you want to use a 14 Volts transformer.
Use a 1000 uF / 35 Volts capacitor as a buffer.
The rectified and buffered voltage will be about 1.4 X higher, so 14 X 1.4 is about 20 Volts.
The maximum voltage for a 555 is about 15 Volts.
You could use a LM7812 to stabelize the volatege back to 12 Volts.

Greetings,
Bertus

Thank you all for your interest
Can I use L7812C Instead of LM7812 ?

 

SUCESS !!!!! i have successfully finished the Circuit .
Thank you ,guys , really appreciate your help .