Theatronics
- Jul 12, 2006
- 158
- Joined
- Jul 12, 2006
- Messages
- 158
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
View attachment 39692
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
View attachment 39692
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