DC 12V Delay Relay Module Board 0-25second Adjustable Timer Relay Turn On/Turn Off Switch Module with Opto-couplers Isolator

Followed the photos here as the instructions were t the best, but overall very happy. Works well and seems good quality.

Easy to use. Works great for led lighting delay for camper van.

I have tested this module thoroughly and can now describe its behaviour. I tested the unit on my workbench, while connected to a 12V DC power supply (12.14V to be exact). When operating from this power supply, the current requirements are as follows:• Quiescent (standby) current : 6.5mA• Operating current (relay energised) : 26-30mA• Opto-coupler drive current : adds another 10mAI started drawing out the circuit diagram of the module, but didn't get very far. At least, I have discovered that there's a series diode for reverse-polarity protection at the 'VCC' power input terminal. The 'SVCC' signal terminal is routed to the anode of an opto-isolator via a 1k resistor, and the 'SIG' terminal is directly connected to the cathode of the same diode (see my sketch). Hence, you can elect to have the unit triggered either by the application of +12V to the 'SVCC' terminal, or by connecting the 'SIG' terminal to GND - provided you hard-wire the opposite signal terminal to the opposite power rail.I have yet to trace where the output of the opto-coupler connects, but it doesn't matter. Suffice it to say that when the opto-coupler diode is driven, the relay is IMMEDIATELY energised. Then, when current to the opto-isolator input is interrupted, the time delay starts counting down. If and when the preset time is reached, the relay de-energises. If the signal to the opto-coupler is re-applied before the delay time is reached, the 'countdown' starts again from the beginning.In summary, this module behaves as a 'run back timer'. That is: the relay energises immediately upon receiving the trigger input, and de-energises n seconds after the trigger is removed. It cannot be used as a 'delayed start' timer - which, unfortunately, is what I bought it for. (I need a timer module to delay switch-on of a Mobius dashcam until the car's power supply has stabilised after starting the engine; else the camera locks up.)One anomaly I discovered with this unit is that when connecting the permanent 12V feed to the 'VCC' terminal (while leaving the opto-coupler input disconnected), there's about a 50/50 chance whether the unit starts up with the relay energised. In my mind, this is erroneous behaviour. This means that you can't switch the system on/off via the 'VCC' input and expect a reliable outcome. Logically, if the signal input(s) are not driven, then the unit should NEVER start up with the relay energised. Thankfully, if it does start up with the relay energised, it will de-energise once the preset time delay has expired and will then work correctly from that point onwards.Finally, a word about the time delay potentiometer setting. I discovered that rotating the trim pot clockwise DECREASES the time delay - this is counter-intuitive. Also, if you turn the pot too far clockwise, it disables the device altogether, and the relay will not operate. EVER! Perhaps this is the condition that some reviewers have experienced, and declared their units to be non-functional.

The media could not be loaded. I am no expert in electronics.It took me a couple of hours but I managed wiring it so that the light goes off after being activated by a push-button.Check vid and pictures, have fun!

I think the adjustment pot is faulty (constantly the same resistance. Therefore I cannot change from the 120 sec. But it does work as expected. Just no adjustable time

Came quickly and works well . A wiring diagram really should come with it

works great easy to install

No instructions and no consistent markings on the PCB. I spent ages searching for information online and drew a blank. NO STARS