Bill, the IC getting over heated and the circuit isn't working...m uploading its layout..

 

What part is overheating? Are you using a 12V power supply (the MOSFET will require it). Since this was for automotive use it was assumed.

There really isn't any way this should overheat, unless there is a wiring error.

There was a thread about a relay overheating due to lack of heatsinking on the leads.

 

No, The Ne555 Ic is getting overheated

the parts i used are as follows:

Ne555
1N4007
5A12VDC Relay
K1336 Transistor
33k (orange orange orange golden)
68K (blue gray orange golden) resistor
100ohm resistor (brown black red golden)
500k Variable Resistor
100uF Capacitor
0.1uF Capacitor (104 is written on it)

 

Pictures Of Layout...

http://img260.imageshack.us/i/realworld.jpg/
http://img716.imageshack.us/i/unpopulated.jpg/
http://img361.imageshack.us/i/image019c.jpg/
http://img132.imageshack.us/i/image018az.jpg/
http://img14.imageshack.us/i/wiperd.jpg/

 

Plz Check Them Out Is There Any Mistake...?

 

the power supply i used was 12VDC 200mA...for checking the circuit...

 

What is the dc resistance of the relay coil?

What is the no load voltage of your power supply?

 

24 i guess...and wat no load ...i dint get it...

 

With the no load and the fully loaded voltage one could figure out the regulation of that supply. I know my 12V, 300 mA supply has a no load voltage of 18.55 and as such, it would cause excessive current in the 555 timers. Knowing your going to use the timer in a system with that type of power supply, you would want to include some power conditioning as in a 7812.

That could be part of the heating problem your having.

 

Do you have pin 1 connected to the positive voltage?

Pin 1 of the 555 is the negative lead.

Pins 4 and 8 are the positive leads.

 

As I thought about it after posting, since your in the automotive arena, you might want to lower the 7555 Vcc to 9V and use a 7809 voltage regulator to regulate the battery and battery charging voltage. You would still have enough output to drive the K1336.

 

i'll check my circuit first on mains by a power supply....9v will work?? nd how many amperes?

 

Do you have pin 1 connected to the positive voltage?

Pin 1 of the 555 is the negative lead.

Pins 4 and 8 are the positive leads.

The Pin 1 is connected to negative voltage and 4 and 8 are connected to the positive...

 

Ag,

The circuit will work at 9 volts, but you can switch the 12 volts for the external circuit (the wipers).

I'm just talking about the 7555 chip being at 9 V

 

m not using 7555 ...m using NE555

 

According to this data sheet, you have connected the 555 to the source instead of the gate. Is this your part number? If not you will need to provide a data sheet.

 

yes i have connected it wrong...on the transistor i have its written "k1336" only... and how much voltage i'll use? 9v or 12v??

 

In this case voltage doesn't matter. It is a side issue. The relay coil is voltage sensitive, whatever it's rating is what you should use. The 555 will work from 4.5VDC to 15VDC.

The MOSFET you have is more valuable than it looks. It is a logic level MOSFET, which can be hard to find sometimes. This style of MOSFET will work at 5V, which is great for future projects.

 

whoaaa!!! its working....thank you Billl....you rockkkk....Thanks Alott...but there's one pb minimum off time is of 9 second and on time is 3 second...i want the on time 1.5 seconds and off-time 5second...which resistors i'll use?? i m confused with that formula....

 

Today i Connected it to a 12VDC 7aH battery .....THE K1336 flew off...