Jump to content
Electronics-Lab.com Community

circuit breaker


Recommended Posts

my best guess?  Try about a 32-34ga wire.
Id suggest you build a rig with 2 terminals that you can wrap the wire around and then cover with a shield.  Wire going vapor can be dangerous.

for a few bucks you can buy a circuit breaker.

You can also use a 'shunt' resistor, a RS flipflop and a mosfet.

Run the circuits ground into the drain of the n-channel mosfet.
Connect the drain to the ground.

Set up the shunt resistor so that when the target current is flowing though it you can read about 3-4 volts.  ( 4v / 7.5 amps = 0.53 ohms )

Take the output of that measurement and feed it into the SET input of the flipflop.

When the current gets close to 7.5 amps, the voltages at the flop/flop input will be high enough to cause the f/f to toggle states.  As a result the /Q (not Q) output of the f/f will go low.  When this happens the N-Channel Mosfet will shut off and the circuit will shut off.

-Mike

post-21534-14279143084061_thumb.jpg

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
  • Create New...