I think you may be right . I wonder if I could use a cheap garden solar cell. Don't see why not if I can get one to run the relay current.It would be many times easier to connect solar cells to a relay. Then sun comes up relay goes ON. When sun goes down relay goes OFF. Relay has 2 sets of contacts NO and NC. Make it simple, make it work.
LTS is telling you that it can't find the file 'photocell.sub' in the directory ...\LTspiceIV\lib\sub. It's also strange that LTS can't find the 2N3904, 2N3906 and 1N4148 models used in Mike's sim. Those models are part of the standard download, IIRC. Perhaps you've over-written some of the original files? Might be worth updating (or re-installing) LTspice. Try 'Tools\Sync release'.I'm not a quitter but I have spent hours trying to get LTSpice to work. Could not find an xphotocell anywhere
The sim varies the LDR resistance only. It is up to you to choose the setting (e.g. half-way, 50k) of the 100k trimpot, to suit the degree of darkness where the circuit trips.The sim seems not to be varying the trimpot that I can see so why wouldn't I just replace it with a 50K resistor.
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I've built this new circuit on veroboard , in a breadboard and on a protoboard and funny thing is I can blow LED's when I play with the pot and one turns the relay hard on and another it stays hard off ! .... Don't see why it would blow LED's unless there is some sort of runaway current or A/c RF stuff going through it.
... Stll can't get one to work though . ..
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