I have been tasked to design a piece of test equipment to test an Lm338 circuit used as a current limiter. I would like to monitor (LED?) a variable input supply (+4 to +20VDC) (2.0A) through a switch that would supply the LM338 circuit. Something that would show that power was supplied to the circuit. Any suggestions? Thanks.
Hi,
a LED with a couple of series diodes and a resistor (3k) will do that.
The 1.6V LED (red) + 1.4V (two diodes) will be off @ <=3V.
At maximum voltage it will be very bright. At minimum voltage it will be very dim.
You could replace the two diodes with a two terminal CCS. Buy a 5mA CCS it will show constant brightness >=6V and dim as 4V approaches.
a LED with a couple of series diodes and a resistor (3k) will do that.
The 1.6V LED (red) + 1.4V (two diodes) will be off @ <=3V.
At maximum voltage it will be very bright. At minimum voltage it will be very dim.
You could replace the two diodes with a two terminal CCS. Buy a 5mA CCS it will show constant brightness >=6V and dim as 4V approaches.
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