Halogen bulb lamp dimmer circuit

 Electrical  No Responses »
Jun 172012
 

Can someone provide me a (simple) schematic for a dimmer that would control 12 VAC about 80 watts. This would be used to control a lamp with halogen bulbs.

Anonymous asked on a comment few years back – Circuits FAQ

Here is a listing study them and choose, try out, learn and then build the one right for you.

delabs

This is a phase angle control of a Triac which is a evolution from an SCR. The 50 Hz or 60 Hz Sine wave of mains can be turned on at any point after the Zero Crossing

Triac based Lamp Dimmer power control

The Voltage ramps up in the sine wave which gives a near “Linear” slope which can be used to trigger the ON at a time delay after zero crossing when the voltage is zero. This is like a PWM but works on low frequency only. Some of the early SMPS(HV for TV and Mains Inverter) by Siemens were built around SCRs. Turning off a SCR is a difficult job for a designer, MOSFETS and IGBT are now used for PWM drive stages.

You can use it with a bulb to vary brightness of bulb, this is a live circuit it can give a shock, enclose in plastic box, the pot should have a plastic knob, use a fuse, you can also use it for temperature control of soldering irons.

The Source file in CadSoft EAGLE format is here del00004.zip

 Posted by at 8:15 am

Mains Voltage Stabilizer Circuits

 Electrical, Schematics  No Responses »
Oct 082010
 

Mains Voltage Stabilizer Circuits

These circuits were drawn for a person in Africa. See the thread here… stabilizer circuit. They were not tested by me, but are quite close to a practical design.

Stabilizer Step up 230V AC 500VA

This circuit is a design i did, not tested by me as yet. It can Stabilize Mains voltage to around +/- 10% . It can be used for both 110V AC or 220V AC inputs with modifications. The Output is 220V AC. There is an overload, under voltage and over voltage trip circuit. With some tweaks and modifications it might work.

Solid-State Stabilizer Step up 110V AC

This circuit is a design concept, not tested by me and i did it just to explain some ideas. The circuit uses opto-coupler MOC3041 of Motorola and the Triac BTA-16-600 of ST as a solid state switch or relay. It also uses the LM324 quad opamp from National Semiconductor which is low power and single supply. As the MOC3041 switches the Triac at zero crossover there is no inter-winding short of transformer on crossover hopefully, the control circuit is designed in such a way that more than one triac will not be turned on at a time, i would like you to give feedback.

 Posted by at 10:56 am

Electric Plug with Switch – Innovation

 Electrical  No Responses »
Sep 072010
 
Electric Plug with Switch - Innovation

I Invented a Switch Plug in my school days but venture capitalists were not invented yet. From Creations This idea struck me when i used to visit flea markets to collect gramophones and calling bells and some chemistry lab flasks and test-tubes too. Electronics had not come to me yet and not much in the [...]

 Posted by at 2:38 pm  Tagged with:

Ni-Cd and Li-ion Battery charger Generic

 Electrical  No Responses »
Aug 082010
 
Ni-Cd and Li-ion Battery charger Generic

This is a Generic charger that is made by many brands, the circuit is an approximation of all. Some improvements suggested. Some brands in europe and usa also use this circuit. This works well, but may not be in the best interest of battery life. The cost of the charger needs to be low. So [...]

One Watt Mains LED Lamp or Tubelight

 Electrical, Schematics  No Responses »
Aug 032010
 
One Watt Mains LED Lamp or Tubelight

Lots if Light on One Watt, yes this works, but should be built by those experienced in High Voltage usage and Knowledge of insulation techniques. This has to be encapsulated in a insulated fire retardant plastic enclosure. You can change the values around what is indicated to experiment with types of White LED available. This [...]

Increase the Range of Your LED Flashlight

 Electrical, Gadgets  No Responses »
Apr 032009
 

Increase the Range of Your LED Flashlight LED flashlights are great technology. You can learn more about LED flashlights on several websites, for example The LED Museum, the Candle Power Forums and FlashlightReviews.com. – Andrew B. Davidson LED Flashlight Circuits Make a Joule thief LED Lantern – Series Connected Voltage Boost Don’s LED Page – [...]

Strippenstrolch – Elektronikbasteln

 Educational Tutors, Electrical, Repair Maintenance  No Responses »
Mar 052009
 
Strippenstrolch - Elektronikbasteln

Strippenstrolch – Elektronikbasteln “Strippenstrolch” is thus a pitch name for “electricians”. “In Germany one finds this designation now and then for an electrician on the work. Particularly in the winter, if it is still dark in the morning, one often sees “Strippenstrolche” with its building lamp on the building site:”

Kilowatt Classroom Electrical Training

 Electrical, Reference  No Responses »
Feb 052009
 
Kilowatt Classroom Electrical Training

Kilowatt Classroom Electrical Training The Industrial Electricians Notebook – Free online electrical books selection that features interesting and timely subjects: electrical theory, electrical reference information, electrical equipment and maintenance data, industrial electronics, and electrical safety regulations. If you like, you can download, print, and assemble your own electrical book. Electrical Books Free On-Line Electrical Books [...]

 Posted by at 8:49 am
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