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I don't remember a 12v driver/transformer in any of the other sketch's, is it supplying 12v to just that one bulb or all of them?
Discuss Flashing LEDs when fan and lights off in the UK Electrical Forum area at ElectriciansForums.net
See post #33. Supplying just that bulb is my understanding. It was rather hidden amongst all the dialogue and explains why the halogen is not itself an adequate 'snubber'.I don't remember a 12v driver/transformer in any of the other sketch's, is it supplying 12v to just that one bulb or all of them?
I am still fascinated by this from post #21.As soon as I disconnect the timer SL the flickering stops.
I suspect that the electronic circuit in the manrose 1351 timer is acting as a dc voltage source circa 14V at its SL output. Tomorrow I will draw you a sketch of what I think the innards of the 1351 looks like. This small voltage current source is sufficient to light the low wattage LEDs dimly. Being dc the snubbers are ineffective since they are a series capcitor -resistor combo.
What we need is a voltage dependent way of isolating the SL output on the 1351 from the conductor going back to the SL on the connector strip to which the LEDs are connected. A zener diode is a possible way. Please would you obtain a few - say 5 to 10 - of these 24V Zener diodes. Here is a link to Rapid Electronics website but using the Amazon and search for 'BZX85C24' you will probably find some of them:
Vishay BZX85C24 24V 1.3W Zener Diode - https://www.rapidonline.com/vishay-bzx85c24-24v-1-3w-zener-diode-47-3088
When you have them you will another connector strip to mount either one or two of these Zener diodes in series with the SL just as it connectes to the SL terminal on the Manrose 1351 timer. I will show you how in a picture once you have the Zener diodes.
Note well: Just because they are 25 V Zeners their leads are at mains voltage so they will need insulating and and enclosure.
See my sketch attached.
I have the same unit to control my shower fan, it switches two independent LED GU10's in the shower cubicle without any flickering, but then I did wire it in accordance with the wiring diagram in post 7 between the SL and N into the Manrose unit after the switch.
I think that's the problem, the OP's fan has its own timer originally he had both the Manrose unit and the timer on the fan operating, did advise him to disconnect the fan timer, but it may need to be by passed.Nice thinking. It will be interesting to see where this goes. Seems like it is definitely linked to the fan somehow.
Thank you so much Marconi for that.
I turned up this ‘open up’ of a manrose timer fan.
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