need help

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sammy004

New Member

• Oct 4, 2005

• #1

Can anyone help me out I'm building a Light dimmer from this website https://www.aaroncake.net/circuits/dimmer.htm
I have a Potentiometer (R1) with 3 contacts and 2 for the switch and I dont know how to hook it up to my circuit I'm not sure which one of the 3 is which one. Also for (TR1) I'm not sure which one is the gate. Can anyone please let me know or does anyone know of an easyer circuit for a light dimmer for 120V floor lamp.

 

jrz126

Active Member

• Oct 5, 2005

• #2

Typically for potentiometers, the pin in the middle is used for the variable resistance.

Also, maybe try looking for the datasheet for the Triac, that will tell you the pinout for it.

 

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sammy004

New Member

• Oct 5, 2005

• #3

So how would I hook up the varible Pot. and I don't have a data sheet for this triac it is exactly the one in the diagram.

 

jrz126

Active Member

• Oct 5, 2005

• #4

you would connect an end pin to the middle pin and then connect those 2 pins to the junction of R2 and C2. then connect the other end pin to lamp (L1)

I cant really help with the Triac

 

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sammy004

New Member

• Oct 6, 2005

• #5

On that circuit can somone please tell me which is the gate and which is the anode 1 and anode 2.

 

Sebi

Active Member

• Oct 7, 2005

• #6

Triac electrodes: gate, MT1,MT2. Most of case the load connected to MT2.
The type is not critical, also usable TIC226, BT136

 

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sammy004

New Member

• Oct 7, 2005

• #7

ok thanks Now I under stand I was just wondering if I hook up this ( https://www.rpelectronics.com/English/Content/Items/NE2-10.asp ) where the light to be controled go what will happen to the 120V neon bulb.

 

audioguru

Well-Known Member

Most Helpful Member

• Oct 7, 2005

• #8

If you connect a neon bulb to the dimmer circuit it will just blow-up since it doesn't have a current limiting resistor. The normal operating current of a neon bulb is so low with a proper current limiting resistor that there won't be enough current for the Triac to function, then the neon bulb won't light.

That dimmer is designed to dim an incandescent (hot wire) light bulb. It can also control an electric heater and some types of electric motors.