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Valid schematic circuit diagrams of fluorescent lamps with a voltage source using 12 volt battery. This circuit 12 volt fluorescent lamp is very useful if the power goes out or can be used in a dark place with no electricity , but can use  the battery 12V . This 12V fluorescent lamp circuit i have tried and the results are bright , durable until decades. You can use 12Volt fluorescent lamps up to 40W . Use quality 12 Volt fluorescent lamp, do not use the fast heat , because the fast was also damage the transistor at 12Volt fluorescent lamp circuit . Do not occasionally mistaken in putting up the transistor . Description for 12 volt fluorescent lamp Circuit Diagrams : R1 = 220R/0.5W R2 = 1/0.5W C1 = 100n/100V C2 = 220uF/50V Q1 = D1885/D1710 A/B= To A fluorescent lamp/ and B to B fluorescent Lamp and just use one pin B = Battery 12 volt with currents above 5A Roll of copper wire on ferrite rod, with : L1 = 1.2 mm diameter wire with many loops winding 20 times L2 = 1.2mm di...

This circuit has a voltage output of about 12 volts with 20mA current voltage. And this series of works using capacitive reactance and resistance are not using, this will reduce the heat on the circuit. To be safe when there is a short-circuit series, always use a fuse on the input voltage is 220V. Here is a series of power supply without a simple transfomer. Power supply Circuit Part List R1 - 1.8K 1W R2 - 100Ω C1 - 0.47µF 400V C2 - 1000µF 50V D1 - 1N4007 D2 - 1N4007 D3 - 1N4007 D4 - 1N4007 ZD1 - 16V Zener Diode ZD2 - 16V Zener Diode ZD3 - 12V Zener Diode

This circuit caught my attention by using cold cathode fluorescent lamp and especially do not use any processor or oscillator. The circuit is powered by the AC mains of 110/127 and apparently the lighting power decrease significantly, but it is interesting to test. This simple circuit Fluorescent Lamp without transformer, operates from 120V AC, uses cold cathode fluorescent lamp and uses an RC circuit to limit the current. Caution! This assembly can be dangerous and cause shocks! We are not responsible for damages and malpractice in the assembly. Simple Fluorescent Without Transformer Circuit Diagram

Basically siren on a police patrol car and an ambulance use electronic circuit connected to the DC current. When the switch is pressed, the siren sounds immediately come out. For those of you who own a car, or any motor you can also create a similar horn. Placement was also very practical. And if you want the flashing lights can add your own. In a series of above do not use flashing lights as the sirens sound. Part List : R1 = 47K R2 = 200R C1 = 0,02uF C2 = 50uF 16V C3 = 0,005uF T1 = 2SB178 PNP transistor S1 = Push button switch G1 = 6-12V battery  TR1 , IT transformer is reversed. used a two-legged. TR2 , OT output transformer OT240 How to use it is to put the above series into a box. Adjust the size to be more practical. Then insert the cable of a car or motorcycle battery voltage as described above that is 6-12 V battery into the plug. In accordance with their respective poles. Three feet of IT transformer wrapped so as not to stick to the body of the car or motorcycle. Cover wi...

             Another method of reducing the starting current of a motor is to step down the voltage to the motor winding through the auto transformer such as is called the “Auto Transformer Reduced Voltage Starter”. This method is applied to high motor with large starting current. Control Operation              Figures below (A) and (B) illustrate the power and control circuit respectively of an “Auto Transformer Reduce Control Voltage Starter”. The control circuit consist of TR timers, contactors S, Y, and R. (A) Power circuit of the “Auto Transformer Reduce Voltage Starter”. Pressing the start push button will energize contactor S and timer TR. Contactor Y is also energized through normally closed contact TR (8-5). Instantaneous contact TR (1-3) will close immediately to maintain the circuit continuously energized. Contact Y (11-12) will open to ensure that contactor R will not be energized. Contact S (1-2,3-4,5-6) and Y (1-2,3-4,5-6) will close to connect the auto transformer T1, T...

Simple and Low-Cost Power supply without transformer. This circuit has a voltage output of about 12 volts with 20mA current voltage. And this series of works using capacitive reactance and resistance are not using, this will reduce the heat on the circuit. Low-Cost Power Supply without Transformer Circuit Diagram To be safe when there is a short-circuit series, always use a fuse on the input voltage is 220V. Here is a series of power supply without a simple transfomer. Part List: R1 - 1.8K 1W R2 - 100Ω C1 - 0.47µF 400V C2 - 1000µF 50V D1 - 1N4007 D2 - 1N4007 D3 - 1N4007 D4 - 1N4007 ZD1 - 16V Zener Diode ZD2 - 16V Zener Diode ZD3 - 12V Zener Diode

Transformer – Coupled Amplifier The main drawback of RC coupled amplifier is low voltage and power gains and poor impedance matching. This is because of the decrease in effective load R AC of each stage. If the effective load resistance of each stage could be increased, the voltage and power gain could be increased. This van be achieved by transformer coupling. Transformer coupling is generally employed when the load is small. It is mostly used for power amplification. Transformer Coupled Amplifier  The above fig shows the two stage transformer coupled amplifier in this circuit the primary of transformer is placed instead of R C . The secondary of transformer replaces a wire between the voltage divider network and base of second stage. The resistors R 1 , R 2 , and R E forms the voltage divider bias and stabilization resistors. The capacitor C E bypass the resistor R E . Operation: The input signal is applied to the base of the first transistor through the capacitor. The amplifie...