I want to use following circuit at 12V DC. Please suggest, is there any changes I have to make in this circuit? The circuit is attached here.

Thanks.

 

The source voltage IS 12V. There is, however a 5V regulator for the TS555. The TS555 is a Logic Level IC and thus requires the 5V, but id you do not need logic level outputs then you could use an LM555 or an NE555 and remove the 5V regulator.

 

I believe that is not a 555 timer chip. It is a motor controller chip. crazybuoy, please post a datasheet.

 

This seems to be a special chip containing more than 1 timer.It is not the common 555. Apparently you will need to contact the manufacturer to buy it and get detailed information.

 

The schematic shows it using 12v for a supply, on the right.

The IC is a Microchip PIC that is programmed to be a stepper motor controller.

 

So does anyone think he needs to make any changes?

I don't see anything wrong offhand, but I don't know what it is being used with. For example, a relay load would need clamp diodes too.

 

<snip> For example, a relay load would need clamp diodes too.

That would also be true of unipolar stepper motors; what the circuit is supposed to drive.

I don't know what our OP wants to drive with it, but it's not going to work with a bipolar stepper motor.

Also, the base resistors are 470 Ohms; that will give a base current of ~9.1mA, for a collector current of ~100mA, which is the absolute maximum collector current rating for the BC547.

So, no mods are necessary for operation on 12v. However, since we don't know what our OP wants to use it for, we can't say if it will work with their particular application.

 

Ahh! the IC says TI 555-1, not TS555. I thought that all those transistors connected to the chip were odd!