How to wire 12v bulbs on a 36 v circuit


The article explains a very simple method of acquiring 220V AC from a 12v DC source. The idea utilizes inductor/oscillator based boost topology with the help of the IC 555.

We are quite familiar about inverters which convert a DC potential to higher AC potentials at mains levels.
However these units involve complex and expensive configurations for acquiring the required outputs.

A much simpler approach of achieving the above results is by employing a oscillator mosfet boost converter circuit.

If the waveforms are not critical for your applications this method can be a lot simpler and cheaper to implement.

Circuit Description

Referring to the circuit diagram below, we see that the entire idea is based upon the versatile, evergreen IC 555.

Here it's configured in its standard astable multivibrator mode for generating the required pulses at a frequency determined by the resistors 4k7, 1k and the capacitor 680pF.

The duty cycle may...

0 0

1. Do my circuits work? (First things first I guess)

First one will, second on probably not as there is no active pull-down to turn off the MOSFET.

2. Is my assumption correct that when using the second schematic, once the Arduino pin is low, the lamp is turned off, however not so when the first schematic is used?

Correct to a degree. In the first circuit the opto is acting like a logic inverter. If you change the wiring in your first circuit so that pin 2 of the opto wires to the Arduino pin 9 and the resistor wires to +5vdc then the inversion goes away (by double inversion) such that an Arduino low output turns off the lamp and a high turns on the lamp.

2. How exactly is R1 and R2 calculated?

R1 determines the internal LED current, usually set to allow 10-20ma to flow. 1K should be fine. R2 sets the collector current of the opto's output transistor when the internal LED is on. This determined by the specific opto chip's datasheet, but is not too...

0 0

Off hand, in case you are a DIY - do it yourself enthusiast - 230 V primary to 12/13 V secondary transformer (if input range is 180 to 240 V AC, this will be better; route the power through a 22o / 240 V switch to the primary; the secondary will be connected to the input of a bridge rectifier (for a smoother output and perhaps less harmonics); the output will be about 12 V DC and perhaps you could include a smoothing (capacitors) in the out put.

The link should help you on the theory part and most of the components are easily available in most electronic shops.

Full Wave Rectifier and Bridge Rectifier Theory

I am a lazy person - about 4/5 years back, I purchased a ready made unit working of 220 V AC, with variable D C outputs varying from 1.5 to 14 V through a small rotary switch. As the output is from a standard power jack, there is also a slider switch for changing the polarity of the output. It works, but the voltages are never close to what the setting says...

0 0

You can use this 5V to 12V converter circuit to easily get 12 volts from a 5V similar source.

This is based of the theory that inductor holds current and passes in opposite direction. This is a DC to DC step up converter, also known as boost converter and it has efficiency of 60-80%.

As the efficiency of this circuit is not very high, so we can’t use it for large projects, which needs max power.

We can use it for low power consuming models. Like 12 Volt 3 watt model, which require 250mA current, and since we are giving 5 volt as input, we have to spend around 720mA current with 80% efficiency.

In this circuit we are going to put DC pulse through an inductor and take the boosted current from the inductor when it’s off. We are using a general purpose high current MOSFET, P55NF06 here which is mostly used in inverters.

And for making the inductor coil, we need to follow the below chart for some expected voltage range.

6v to 12v @ 1Amp : 80 turns...
0 0

There are four ways to solar charge a lithium ion battery that I know of; please comment if you know of others or better ways. Each has their advantages and disadvantages. A difficulty with solar charging lithium ion batteries for electric bicycles is that the best voltage to use for motor powers from 200W to 500W is 36V. This in nearly exclusively a voltage used for electric bicycles and it's near impossible to find commercially available systems for charging this voltage with care needed to make sure it's suitable for lithium ion chemistry (36V regulators for lead acid batteries can be found, many of these regulators can be set at 12, 24, 36 or 48V).

Here are the methods I can think of with their approximate prices and pros and cons -

1) Get a standard grid connected solar system and then use your charger from the mains power. Approximately $3000 for a 1.5kW system in Australia with current government rebate scheme. Advantages - can charge at any time you like,...

0 0

Using LED’s as a light source is a no brainer! LED’s boast 40-50x’s the burn time, 1/10th the power usage and little to no heat emissions. Despite all these benefits LED’s can cost up to 30x’s more per bulb. In the long run LED’s pay for themselves but the initial investment can be substantial depending on the space you need to light.


There are several options when it comes to installing LED’s into your RV: LED fixtures & light bars and bulbs. The Land Yacht had 6 existing light fixtures that use 18 small incandescent bulbs. We wanted to utilize these existing fixtures so we began looking into LED bulbs that are made for these 12v sockets. We quickly found that these 12v LED bulbs are not cheap! At almost $19 per bulb it would cost us over $340 to convert all our lights to LED. (Compare this to .60 per incandescent bulb!)

LED Lights for Existing Fixtures $19ea!

So we began looking for different, cheaper, LED options…

I had heard...

0 0
Images (Click on Image to Visit Page)

Tail, Brake, Turn Signal & Reverse (Back-up) Bulbs

7443 (Dual Circuit) = 7443 7444 W21 5W

7440 (Single Circuit) = W21W WY21W 7441

Wedge T25 S25 Tail-Brake-Turn Signal & Back-Up Bulbs (3157 3156 3457 4157 3057)

Tail, Brake, Turn Signal & Reverse (Back-up) Bulbs

Our 3157 Bulbs Replace: 3047 3057 3155 3156 3157 3157LL 3357 3454 3457 3757 4057 4114 4114LL 4114K 4157 4157LL

3156 Replaces: 3456 4156

LED Flashers and Load Resistors Equalizers

Turn Signal, Bulb Out warning & HID Light Fixes

194 = W5W W3W 147 152 158 159 161 168 184 192 193 259 280 285 447 464 501 555 558 585 655 656 657 1250 1251 1252 2450 2652 2821 2921 2825 PC 175 2886X led light bulbs

Interior, Side Marker & Gauge Bulbs

Our 194 Bulbs Replace: 194 = W5W W3W 147 152 158 159...
0 0

Hard to Find Bulbs-Misc. Series

Lamps ordered will be shipped the next business day by USPS Priority Mail or UPS. Large orders may qualify for a discount and may not qualify for next day shipment. If you do not know what lamp you require or for lamps not listed, email your request or call 336-882-2854. To order, please call 800-692-3051.

These bulbs are not purchased directly from the manufacturer. We purchased these bulbs from auctions and businesses that discontinued selling bulbs or went out of business. All are new and most are in original display boxes. Some of the boxes may be ragged or missing, but the lamps are guaranteed new. Most of the lamps are GE or Sylvania brand. Some of these lamps are other brands like 3M, Apollo, Atlas, Avigo, Bell & Howell, BIAI, BMG, Candex, CEW, Chicago Miniature, Colortran, Cool-Lux, Dorcy International Inc, Durst, Eiki, Eiko, EYE, Filmo, Gilway, GOKO, Kalimar, Kando, Kandolite, Ken-Rad, Kondo, Lamco, Narva, Norelco,...

0 0
0 0