I need 12vdc pulsating from a 12vdc pwr source

[Dark Alchemist]

How can I get 5-120 hz pulsating 12 vdc from a 12vdc pwr source?

Anyone have any ideas using the least amount of parts?

Thank you.

 

[Ross Mac]

How can I get 5-120 hz pulsating 12 vdc from a 12vdc pwr source?

Anyone have any ideas using the least amount of parts?

Thank you.

I don't know what your current requirements are, but if it's less than 1
watt or so, a 555 timer circuit should do the job.....Just google
around...there is a ton of data on that chip....good luck....Ross

 

[Dark Alchemist]

I don't know what your current requirements are, but if it's less than 1
watt or so, a 555 timer circuit should do the job.....Just google
around...there is a ton of data on that chip....good luck....Ross

12v at about 450-600ma so well above that 1w range

 

[default]

12v at about 450-600ma so well above that 1w range

Add a single pass transistor to the 555 to boost the output current,
one transistor one resistor more.

 

[Ross Mac]

Add a single pass transistor to the 555 to boost the output current,
one transistor one resistor more.

Good advice there...just amplify the output.....good luck, Ross

 

[John Fields]

12v at about 450-600ma so well above that 1w range

---
A MICREL 4429, a pot, and a cap will do it for 3 parts. Two extra
resistors (maybe just 1) if you want to set the pot's limits at 5Hz and
120Hz.

Interested?

 

[Robert Monsen]

How can I get 5-120 hz pulsating 12 vdc from a 12vdc pwr source?

Anyone have any ideas using the least amount of parts?

Thank you.

John's timer will probably be a good one, but here is one that, while using
more parts, uses parts that are readily available at radioshack.

Make sure you get a cmos 555... look at the package, and make sure its max
Vcc is greater than 12V.

Also, any N-MOSFET you can get will work here.

Adjust the 1MEG trimmer to adjust the frequency.

http://home.comcast.net/~rcmonsen/misc/cn555.jpg

Regards,
Bob Monsen

 

[Indian Summer]

The simpliest amount of part? Yank a dimmer from the salvage yard. No 555
needed.

Turn the knob and you go from about 5 - 1000 hz pulsating - 12V. I used
this trick to arc a coil. What're you making?
Indi

 

[Dark Alchemist]

The simpliest amount of part? Yank a dimmer from the salvage yard. No 555
needed.

Turn the knob and you go from about 5 - 1000 hz pulsating - 12V. I used
this trick to arc a coil. What're you making?
Indi

Thanks all.

A dimmer? Now that has me interested.

As to what I am making its just a test circuit because the circuit works
when hooked up to a 9 volt battery and it touches (arcs) between on and
off on the positive lead. Give it a steady 12vdc and it is next to not
working. Has me stumped so I figured had to want a pulsating DC and
since I have no source for that I can't test it.