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  1. D

    Building a sunset dimmer

    I'm trying to simulate a circuit that dims a 12V lamp over a 1.5hour time period. I use LTSpice as my simulator. I need to do the simulation over about 7000 seconds. I set this with a max step size of 1s, but for some reason LTSpice thinks it needs a step size in the us range. It will take...
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    NT1900 as a current limit source

    I have a nte1900 in my circuit hooked up as a current limit source. The connections are VI->30V, VO->31.5ohm resistor->VCCInt and Adj is connected to ground. This should give me ~27V supply that is current limited to 40mA, at least that was my desire. I've noticed that when VCCInt is open...
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    Use LED to denote current flow in AC circuit

    All, I'm using this 555 based polarity switching circuit as my base: https://www.electronicspoint.com/555-timer-reverse-polarity-circuit-t250411.html My supply is 30V DC so I'm using a DPDT relay to switch the legs. I'd like to put LEDs in the actual legs to show that everything is truly...
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