Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

voltage spike detector

voltage spike detector

voltage spike detector

Is there a circuit out there (instead of an oscilloscope) that can detect higher than 28V voltage spike. This circuit should have an indicator (LED) that a greater than 26 Volts spike has been detected. I expect the spike to be 100 nanoseconds.
Thanks in advance.

RE: voltage spike detector

thanks peterb!!!but I am looking for a cheaper alternative to oscilloscope (w/ trigger).
This circuit must detect a voltage spike greater than ...say 26volts and if it detects one, there should be a way of knowing it like a simple LED.
I tried to use a comparator but op-amps operate at not more than 10MHz response and what I know is that , spike ranges at 10-100 nanoseconds that is why we need high bandwidth scopes w/ trigger to detect one.

RE: voltage spike detector

What is the normal voltage on the line ? DC or AC ?
Is this one piece or for production (How much may it cost?)

Is it enough to indicate/store one event or do you need
more info ? What ?


RE: voltage spike detector

Normal Voltage would be 26 VDC. This spike detector should indicate any event (eventhough spike occurs every second) by LED (or TTL output or latch circuit).

RE: voltage spike detector

If you latch it, it will indicate the first event only.

Are you speaking about a 28 V spice superimposed on 26V DC or only 2V ?

What do you want to do if there are more spikes ?
What about their amplitudes and durations ?


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close