555ic @ 15 volts

[marfire]

Hello everyone, I'm making a simple 555ic DC motor controller for a 24v motor. My power supply is 24 volts, and I was planning on supplying power to the 555 circuit through a 7815 or a 7812. My question is, if I use the 7815 (at 15 volts of course) do I need to put a heat sink on the 555, or would it be more simple to just use the 7812 and supply 12 volts to the 555. Thanks for your help!

 

[ronv]

The 15 volts is getting pretty close to the maximum rating of the 555. It doesn't sound like in your application (driving a FET?) you would need a heatsink, but 12 volts would be a safer value. If you are driving a transistor and need high base current that could be another story.

 

[marfire]

Yeah I'm driving a FET. Even so, I'll take your advice and go with 12 volts. Thanks for your help!