Dropping 1 in 3 10v pulses

Discussion in 'The Projects Forum' started by Tdit, Oct 8, 2012.

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1. Tdit Thread Starter New Member

Oct 8, 2012
6
0
Hello all!

I'm trying my hand at building something I can buy off the shelf.

Simple project, but I'm having a lot of trouble working it out.

Objective:
Drop one in theree 10v pulses received from "input", and deliver the resulting 66% of "input" to "output". I would like to achieve this without loosing voltage, but I can drop the output to 7 volts if need be.

Operating power:
10volts "input" approximately.
7 to 10volts "output"
Wattage: <0.5W

I would rather build than buy - if only from the learning experience. If someone could point me in the right direction I would greatly appreciate it.

Cheers and thanks!

Last edited: Oct 8, 2012
2. MrChips Moderator

Oct 2, 2009
12,421
3,357
Drop the "automotive application" and you're ok.
Say "I need a circuit that will reduce an input frequency by 66%"

Tdit likes this.
3. MrChips Moderator

Oct 2, 2009
12,421
3,357
You can divide the input frequency by three using a divide-by-3 counter.
Then you can multiply the signal by two using a frequency doubler or a phase-locked-loop.

4. alexfreed Member

Oct 8, 2012
72
10
Unless you need equally spaced pulses, a PLL is clearly an overkill. The easiest solution is probably to use a CD40xx chip that is happy with 10 V power to build a modulo 3 counter.
Either a dedicated counter or 2 flip-flops will do. A power MOSFET can act as a switch enabling the input 10 V pulse to the output. One out of 3 states of the counter will disable the switch.

5. THE_RB AAC Fanatic!

Feb 11, 2008
5,435
1,305
Does it run at a fixed frequency or over a range of frequencies?

6. Tdit Thread Starter New Member

Oct 8, 2012
6
0

The input will be over a range from 0 to 200 pulses per second.

7. Tdit Thread Starter New Member

Oct 8, 2012
6
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I want to thank everyone for their input and quick responses! Really appreciate it!

I'm going to research the suggestions and see what I can put together. I'm a hobbiest in electrical engineering only, so I work a tad slower than most

8. Tdit Thread Starter New Member

Oct 8, 2012
6
0
Hi, really appreciate your suggestion, although I can't view your pics. Maybe cos I'm new =)

If I use a db3, how would i then step it back up to twice that rate? I need to reduce the original by 33%, leaving 2 out of 3 pulses in tact.

9. Tdit Thread Starter New Member

Oct 8, 2012
6
0
This sounds good - and I even think it's inside my skill level =) I'll do some research on the components =)
Thank you =)

10. Tdit Thread Starter New Member

Oct 8, 2012
6
0
I recall the cd4023(?) being mentioned during some earlier research, but there was some drawback that prevented it being used in my application. I'm going to revisit that option and do more reading!

Thank you =)

Apr 5, 2008
15,645
2,344
Hello,

It is unfair to hide the automotive application.

I am closing this thread as it violates AAC policy and/or safety issues.

Quote:
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• Any kind of over-unity devices and systems
• Automotive modifications
• Devices designed to electrocute or shock another person
• LEDs to mains
• Phone jammers
• Rail guns and high-energy projectile devices
• Transformer-less power supplies
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