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here's the datasheet: http://www.jaycar.com.au/products_uploaded/SY-4080.pdfhere's the circuit: http://www.diyaudio.com/forums/attachment.php?s=&postid=989299&stamp=1156387690
The "trigger control" of the relay is connected to a simple ne555 circuit. After initial turn on, pin 3 (of the ne555) is high. After 11secs, it goes low.
I have tested the ne555 circuit 15 minutes ago using an LED between pins 8 and 3 (of the ne555) and the LED lights up after 11secs. I believe this is the correct behavior.
when the amp is turned off, I checked for continuity between pins 1 and 2 (of the relay) and there is no connection. Pin 1 is connected to the "line" wire of the AC mains.
I connected the red wire of the VOM to pin2 (of the relay) and the other lead to neutral wire of the AC mains. Obviously there is no voltage when the AC switch is off. BUT immediately after turning it on, the VOM reading goes to 240VAC.
I believe I should only detect 240VAC on pin2 if there is enough load (datasheet says minimum 24V load) and ONLY after 11secs has passed. I believe a VOM shouldn't present enough load on the relay to produce an output. AND even if the VOM does present at least 24V load, I should only get 240VAC after 11 secs.
any ideas/suggestions?
Follow Ups:
That is saying there must be at least a 24V AC supply for the switch to work correctly. This is not a minimum LOAD.Your LED test says the timer is working OK as a delay.
I presume the amp is coming on immediately? Therefore the switch SSW itself is shorted (it may well be open with no supply connected)
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When relay contacts are open you should read voltage accross them. (240VAC)When the relay contacts are closed you should read 0 volts accross them.
Same for a solidstate relay.
When it is off you should read the entire voltage you are switching.
When on you should read a very low vlotage (Datasheet says max on state voltage drop 1.5V)
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it should read 0V for the 1st 11 secs after AC switch has been turned on.It was working months ago. after 11secs, it would power up the transformer. Also when it was working, I cannot get a reading when I just put ONLY a VOM the output (no transformer or any other load).
I have to stop the project due to other more important things.
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