I need a current sensing circuit solution for my application. I have a power board which has 5v line and 24v line. Each lines are going to two different loads. In load 1 which has 5v input i have an internal thermal switch which shuts it off when temperature increases. So, I need some hardware solution(current sensing switch / transistor/op-amp etc) to sense the current on 5v line when load 1 shuts off (which would be 0 Amp) and accordingly turn off load 2. I need some cheap solution by which i mean which doesn't require to ad a new additional board. The 5v line draws 1.5 amps current and the 24v line draws 2 amps current.

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    \$\begingroup\$ Double pole relay which is controlled by the thermal switch. \$\endgroup\$ – vini_i Feb 7 at 20:30
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    \$\begingroup\$ A differential amplifier to turn the current through a small shunt resistor to a measurable voltage or the 1NA619 is a prebuilt current sense solution \$\endgroup\$ – Simeon R Feb 7 at 20:30
  • \$\begingroup\$ Please ask a more specific question related to design, this question as it stands is off topic \$\endgroup\$ – Voltage Spike Feb 7 at 20:36
  • \$\begingroup\$ How is your 5V supply regulated? I would expect you already have a signal in your power supply which correlates to the current your 5V load is drawing. \$\endgroup\$ – james Feb 7 at 22:03

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