dimmer switch

[bs123]

Hi all

Have a dimmer switch in the lounge switching only the main light in the lounge.
The thing is when i switch it on the light keeps flickering,if i then turn the dimmer
switch up it blows the bulbs. Have i got the wrong bulbs or a faulty dimmer switch?

 

[Hawk81]

what sort of bulbs have you got?

 

[martysparky]

low energy bulb???

 

[Hawk81]

low energy bulb???

thats what i was thinking. If so then thats the problem.

 

[Adam W]

Or it could be faulty transformers. Depends what kind of lights/bulbs/dimmers you've got.
Best get an electrician in to have a look at it, but not off MyHammer.

 

[aaza]

Hi all


Have a dimmer switch in the lounge switching only the main light in the lounge.
The thing is when i switch it on the light keeps flickering,if i then turn the dimmer
switch up it blows the bulbs. Have i got the wrong bulbs or a faulty dimmer switch?

There are many thyristor circuits that are in common use. They can be sued in many applications from AC control as in the case of motor or light dimmers to other circuits including power supply crowbar circuits.
The circuit below shows a power supply crowbar circuit. It can be used to protect circuitry within the main equipment from the effects of the failure of the series regulator in a power supply. If the series regulator fails short circuit, then high voltages can be paled on the power rail inside the equipment and this could result in serious damage to the overall equipment.

Thyristor overvoltage crowbar circuit
The SCR over voltage crowbar or protection circuit is connected between the output of the power supply and ground. The zener diode voltage is chosen to be slightly above that of the output rail. Typically a 5 volt rail may run with a 6.2 volt zener diode. When the zener diode voltage is reached, current will flow through the zener and trigger the silicon controlled rectifier or thyristor. This will then provide a short circuit to ground, thereby protecting the circuitry that is being supplied form any damage.

IT maybe the zener diode is faulty you would need a scope to see it triggering

 

[mogga]

Confused.com

 

[m4tty]

There are many thyristor circuits that are in common use. They can be sued in many applications from AC control as in the case of motor or light dimmers to other circuits including power supply crowbar circuits.
The circuit below shows a power supply crowbar circuit. It can be used to protect circuitry within the main equipment from the effects of the failure of the series regulator in a power supply. If the series regulator fails short circuit, then high voltages can be paled on the power rail inside the equipment and this could result in serious damage to the overall equipment.

Thyristor overvoltage crowbar circuit
The SCR over voltage crowbar or protection circuit is connected between the output of the power supply and ground. The zener diode voltage is chosen to be slightly above that of the output rail. Typically a 5 volt rail may run with a 6.2 volt zener diode. When the zener diode voltage is reached, current will flow through the zener and trigger the silicon controlled rectifier or thyristor. This will then provide a short circuit to ground, thereby protecting the circuitry that is being supplied form any damage.

IT maybe the zener diode is faulty you would need a scope to see it triggering

nice one mate

 

[ezzzekiel]

little ott
try diff bulb or swap dimmer........NEXT

 

[Hawk81]

little ott
try diff bulb or swap dimmer........NEXT

agreed

 

[martysparky]

There are many thyristor circuits that are in common use. They can be sued in many applications from AC control as in the case of motor or light dimmers to other circuits including power supply crowbar circuits.
The circuit below shows a power supply crowbar circuit. It can be used to protect circuitry within the main equipment from the effects of the failure of the series regulator in a power supply. If the series regulator fails short circuit, then high voltages can be paled on the power rail inside the equipment and this could result in serious damage to the overall equipment.

Thyristor overvoltage crowbar circuit
The SCR over voltage crowbar or protection circuit is connected between the output of the power supply and ground. The zener diode voltage is chosen to be slightly above that of the output rail. Typically a 5 volt rail may run with a 6.2 volt zener diode. When the zener diode voltage is reached, current will flow through the zener and trigger the silicon controlled rectifier or thyristor. This will then provide a short circuit to ground, thereby protecting the circuitry that is being supplied form any damage.

IT maybe the zener diode is faulty you would need a scope to see it triggering

switch circuit designer or googled? or other? confused.com too

 

[bs123]

Hi Thanks for all the advice hopefully i can get it sorted now.

 

[blackiel]

IF I Had A Hammer....

 

[lloyd1980]

There are many thyristor circuits that are in common use. They can be sued in many applications from AC control as in the case of motor or light dimmers to other circuits including power supply crowbar circuits.
The circuit below shows a power supply crowbar circuit. It can be used to protect circuitry within the main equipment from the effects of the failure of the series regulator in a power supply. If the series regulator fails short circuit, then high voltages can be paled on the power rail inside the equipment and this could result in serious damage to the overall equipment.

Thyristor overvoltage crowbar circuit
The SCR over voltage crowbar or protection circuit is connected between the output of the power supply and ground. The zener diode voltage is chosen to be slightly above that of the output rail. Typically a 5 volt rail may run with a 6.2 volt zener diode. When the zener diode voltage is reached, current will flow through the zener and trigger the silicon controlled rectifier or thyristor. This will then provide a short circuit to ground, thereby protecting the circuitry that is being supplied form any damage.

IT maybe the zener diode is faulty you would need a scope to see it triggering

would you really source a 'zenner scope' ?

or just try another lamp or maybe another dimmer

I know my choice and the word zenner isnt in there

 

[lloyd1980]

maybe you would be lucky and find a use for that damn zenner scope thats been cluttering up the back of your van for years, spend ages setting it up
then discover after countless measurment through the zenner scope you need a new lamp

........then just get a lamp

........and replace the lamp

........and put the zenner scope back in the van next to the kryptonite