Turns out there is little need for all the complexity and components ! This given in Transistor amplifiers on Talking Electronics site is quite adequate-Don't understand why they want too show off their knowledge and waste your time making a simple thing complex .
Clearly you pose the question to get an answer but its not coming on this forum. Its gone haywire
http://www.talkingelectronics.com/p...mplifier/TheTransistorAmplifier-P2.html#Relay
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However I came here for an answer to apply to a problem .I am engaged in installing LED spotlights , movement and daylight sensitive in 24V only and want to get it done .... I still need a light sensor in one situation because it is so dark in there during the day that the relay is on almost 24 hours so the lights drain the batteries.
... A lot of these 24 V spotlights have been sold here and the PIR's sold with them were rubbish meant for 12 Volt and blew up .They had a 12 V zenner which was sometimes good enough but 9 out of 10 not good enough and blew other components . Who has time to fix them? Thats where the relays came from. I have about 12 of them all from dead boards
My choice of coils is going down now .I used one in another circuit which measured 1640 Ohms and tried another at 178 Ohms with the same results . The same values tried in the sim still switch the sim. I have yet to investigate why such a high reading on the coil in circuit.Looks like D1 is backwards. My eyes are not able to see the flat at times .Merely a rotate Ill fix it
Q1 is the NPN that drives the relay on my schematic, you have it labeled Q2? Is it really a NPN?
You must have got to it while I was editing it Q1 is the relay driver and it is NPN.Perhaps you get an email or something. I edit posts all the time .Hate to have the content sloppy or wrong
Q2 is PNP that is nearest the trimpot on my schematic, you have it labeled Q1? Is it really a PNP?
As above Q2 is the LED driver and is PNP
The copper trace under R4 is cut? Yes
Top trace is +24V? Bot trace is 0V? Yes
VR1 is 10K? Yes marked 103
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