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 12V to +/- 30V DC to DC Converter circuit Diagram This is a DC to DC converter for car power amplifier. 12V input generates +30V and -30V output for preamp or power amplifiers. Circuit uses SG3525 IC, Mosfets and switching power supply.

This circuit is a DC voltage output from a small DC input generate large voltage.It ‘s easy and quick to do, and reducing the value of the Z-diode, the circuit can be universally adapted to other output devices of the circuit voltages. The give and all diagrams represent a DC converter with 12V battery 9 volt DC input and output.     12-9 Volt DC to DC Converter Circuit Diagram With the 10V zener diode, as in the diagram, the output voltage is approximately 9.3 volts DC. The supply voltage is used, should always be at least a few volts higher than the Zener voltage. In this example, I have a 12 Volt DC battery to provide regulated 9-volt DC output.

This simple circuit is a DC-DC converter that converting up 12V source to a 24V . It can be used to run radios, small lights, relays, horns and other 24V accessories from a 12V vehicle with a maximum draw of about 800mA. This DC-DC Converter can be used to charge one 12V battery from another, or step up the voltage just enough to provide necessary overhead for a 12V linear regulator. Using one op-amp as a squarewave oscillator to ring an inductor and another op-amp in a feedback loop, it won't drift around under varying loads, providing a stable 24V source for many applications. With a wide adjustment in output this circuit has many uses.  Parts List R1-R4,R7-R8 100K 1/4W Resistor  R5 470 Ohm 1/2W Resistor  R6 10K Linear Pot  C1 0.01uF Mylar Capacitor  C2 0.1uF Ceramic Disc Capacitor  C3 470uF 63V Electrolytic Capacitor  D1 1N4004 Rectifier Diode  D2 BY229-400 Fast Recovery Diode See Notes Q1 BC337 NPN Power Transistor  U1 LM358 Dual O...

                                           This is the circuit diagram of 5V DC regulated power supply which featured with short circuit protection system. There are 2 kind of output that are regulated 5V DC with short circuit protection and without circuit protection. The main circuit is protected from any damage due to short-circuit in the additional power supply circuit by cutting off the derived supply voltage. The derived supply voltage restores automatically when shorting is removed. An indicator LED is utilized to show whether short-circuit exists or not. Power Supply Block: This circuit works just like the ordinary DC power supply adapter, in the main power supply circuit, 230V AC from main home electric source is stepped down by transformer X1 (230V AC primary to 0-9V, 3...

HANDY 0-12V DC POWER SUPPLY ELECTRONIC DIAGRAM For heat protection, heat sink is needed for the BD679 transistor. It is because it will be over tempered when works more than 200mA. FEATURES: 0v to 12 volt output: - 700mA with M 2155 - 1.4amp with M 2156 - 1A with 16v AC 1.5 amp plug pack

Build a 12V To 24V DC-DC Converter Circuit Diagram .This simple 12V To 24V DC-DC Converter Circuit Diagram can provide up to 24V from a 12V source. It can be used to run radios, small lights, relays, horns and other 24V accessories from a 12V vehicle with a maximum draw of about 800mA.  It can be used to charge one 12V battery from another, or step up the voltage just enough to provide necessary overhead for a 12V linear regulator. Using one op-amp as a square wave oscillator to ring an inductor and another op-amp in a feedback loop, it won't drift around under varying loads, providing a stable 24V source for many applications. With a wide adjustment in output this circuit has many uses.  12V To 24V DC-DC Converter Circuit Diagram Parts Part Total Qty. Description Substitutions R1, R2, R3, R4, R8, R7 6 100K 1/4W Resistor R5 1 470 Ohm 1/2W Resistor R6 1 10K Linear Pot C1 1 0.01uF Mylar Capacitor C2 1 0.1uF Ceramic Disc Capacitor C3 1 470uF 63V Electrolytic Capacitor D1 1 ...

This circuit is more of a DC to AC inverter, it uses a 555 IC as a low frequency oscillator, adjustable, adjustment can be done by the potentiometer R4 and frequency should be between 50-60 Hertz. The pulses from the IC 555 will go to Q1 and Q2 are amplified and sent to the transformer T1, which has its winding reversed. Capacitor C4 and coil L1 filter are the input to T1, it effectively ensures that a sine wave is formed.  DC to AC Inverter with 555 Circuit Diagram List of components R1 = 10K R2 = 100K R3 = 100 ohms R4 = 50K potmeter C1, C2 = 0.1μF C3 = 0.01μF C4 = 2700μF Q1 = TIP41A, NTE196, ECG196 Q2 = TIP42A, NTE197, ECG197 L1 = 1μH T1 = Transformer

This circuit is more of a DC to AC inverter, it uses a 555 IC as a low frequency oscillator, adjustable, adjustment can be done by the potentiometer R4 and frequency should be between 50-60 Hertz. The pulses from the IC 555 will go to Q1 and Q2 are amplified and sent to the transformer T1, which has its winding reversed. Capacitor C4 and coil L1 filter are the input to T1, it effectively ensures that a sine wave is formed.  DC to AC Inverter with 555 Circuit Diagram List of components R1 = 10K R2 = 100K R3 = 100 ohms R4 = 50K potmeter C1, C2 = 0.1μF C3 = 0.01μF C4 = 2700μF Q1 = TIP41A, NTE196, ECG196 Q2 = TIP42A, NTE197, ECG197 L1 = 1μH T1 = Transformer

This circuit is ideal to control the cooling fan of heat generated electronic gadgets like power amplifiers. The circuit switches on a fan if it senses a temperature above the set level. The fan automatically turns off when the temperature returns to normal. The circuit uses an NTC (Negative Temperature Coefficient) Thermister to sense heat. NTC Thermister reduces its resistance when the temperature in its vicinity increases.IC1 is used as a voltage comparator with two potential dividers in its inputs. Resistor R1 and VR1 forms one potential divider connected to the non inverting input of IC1 and another potential divider comprising R2 and the 4.7K Thermister supplying a variable voltage to the inverting input of IC1. VR1 is adjusted so as to give slightly lesser voltage at the non inverting input than the inverting input at room temperature. DC Fan Controller Circuit Diagram In this state, output of IC1 will be low and the Fan remains off. When the temperature near the Thermister incr...

Positive output step-up and step-down dc-dc converters have a common limitation in that neither can handle input voltages that are both greater than or less than the output. For example, when converting a 12-V sealed lead/acid battery to a regulated +12 V output, the battery voltage might vary from a high of 15 V down to 10 V. By using a MAX641 to drive separate P-and N-cbannel MOSFETs, both ends of the inductor are switched to allow non inverting buck/boost operation. A second advantage of the circuit over most boostonly designs is that the output goes to 0 V when shutdown is activated. Inefficiency is a drawback because two MOSFETs and two diodes increase the losses in the charge and discharge path of the inductor. The circuit delivers +12 V at 100 mA at 70 percent efficiency with an 8-V input. Step up Down DC - DC Converter Circuit Diagram

Car 12V to 50V DC Converter Circuit Diagram This circuit for Car audio input battery 12V to 50VDC, It use transistor and IC TL072.