DC motor Control, Timer - Electronic Circuits Projects Diagrams Free

mitchell.s · 6th October 2007, 05:52 PM

I'm new to this forum but was looking for help.

I am planning on building a timer. What I am trying to accomplish is to turn a DC motor on for 5 sec. or so and then turn off for 48 hours.

Is there a simple circuit I could build to do this? I have seen 555 circuits but they don't seem to be able to have a duration that long.

Thanks for any and all help.

audioguru · 6th October 2007, 06:06 PM

Use a CD4536 oscillator/frequency-divider/monostable.
Use a reasonable oscillator frequency then set it to divide it up to 2 to the 24th power (you work it out) for a 48 hours output.
Set its monostable to 5 seconds and for it to be triggered by the 48 hours output.

mitchell.s · 6th October 2007, 06:33 PM

Can you give me a little more details than that. Most likely I'll be buying a bread board and soldering jumpers between chips but I don't know how to do it. Possible Schematic?

audioguru · 6th October 2007, 08:18 PM

Start by looking at the datasheet for the CD4536. It tells you all about it.

6th October 2007, 05:52 PM	(permalink)
mitchell.s New Member	DC motor Control, Timer I'm new to this forum but was looking for help. I am planning on building a timer. What I am trying to accomplish is to turn a DC motor on for 5 sec. or so and then turn off for 48 hours. Is there a simple circuit I could build to do this? I have seen 555 circuits but they don't seem to be able to have a duration that long. Thanks for any and all help.

6th October 2007, 06:06 PM	(permalink)
audioguru Experienced Member	Use a CD4536 oscillator/frequency-divider/monostable. Use a reasonable oscillator frequency then set it to divide it up to 2 to the 24th power (you work it out) for a 48 hours output. Set its monostable to 5 seconds and for it to be triggered by the 48 hours output. __________________ Uncle $crooge

6th October 2007, 08:18 PM	(permalink)
audioguru Experienced Member	Start by looking at the datasheet for the CD4536. It tells you all about it. __________________ Uncle $crooge

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6th October 2007, 06:33 PM	(permalink)
mitchell.s New Member	Can you give me a little more details than that. Most likely I'll be buying a bread board and soldering jumpers between chips but I don't know how to do it. Possible Schematic?