Salvador12
Full Member level 4
Hey.
So my idea sis this. I will build/change my speaker protection output from mechanical relay to mosfet relay. But because mosfets can switch current at a fast rate, during a DC fault at the output the mosfet will switch off and the current within wires/coils will produce an inductive spike. In order to mitigate this spike I want to add a triac in series with a low ohm resistor to dissipate such spikes. The idea is that each time the mosfets switch OFF the triac comes ON.
The problem is I can't come up with a circuit that would accomplish this.
It would need to function like this. When the opamp switches the 2N5401 transistor off, current stop flowing through the Si8752 chip and the output mosfets switch OFF. at the same time when current is switched off through the Si 8752 a voltage would need to be applied to a triac to short the output.
I would think I could somehow use the circuit switching the Si8752 primary side to accomplish this but how?
Please see the schematic.
So my idea sis this. I will build/change my speaker protection output from mechanical relay to mosfet relay. But because mosfets can switch current at a fast rate, during a DC fault at the output the mosfet will switch off and the current within wires/coils will produce an inductive spike. In order to mitigate this spike I want to add a triac in series with a low ohm resistor to dissipate such spikes. The idea is that each time the mosfets switch OFF the triac comes ON.
The problem is I can't come up with a circuit that would accomplish this.
It would need to function like this. When the opamp switches the 2N5401 transistor off, current stop flowing through the Si8752 chip and the output mosfets switch OFF. at the same time when current is switched off through the Si 8752 a voltage would need to be applied to a triac to short the output.
I would think I could somehow use the circuit switching the Si8752 primary side to accomplish this but how?
Please see the schematic.