Power Supply Adapter

This power supply will give you fixed regulated output at 5V, 6V, 9V and 12V, while the 18V output is unregulated. You could add some regulated IC like LM7815 or 7818 if you need higher output voltage. This circuit provide an audio indicator that will act like an alarm if any circuit short contact.

This is the power supply circuit for general purpose usage. The supply can be used for supply output voltages from 1 to 35V. The line transformer should be selected to give about 1.4 times the desired output voltage from the positif side of filted capacitor C1 to ground. Potensiometer R2 sets the output voltage to the desired value by adjusting the reference input. Rsc is the current limit set resistor. For example, if the maximum current output is to be 1A, Rsc=0.65/1.0 = 0.65 Ohm. The 1KOhm resistor,R5, is a light-loaded resistor designed to improve the no-load stability of the supply.

Battery charger for general purpose usage. The charger's output voltage is adjustable and regulated, and has an adjustable constant-current charging circuit that makes it easy to use with most NiCad batteries. The charger can charge a single cell or a number of series-connected cells up to a maximum of 18V. Power transistors Q1 and Q2 are connected as series regulators to control the battery charger 's output voltage and charge-current rate. An LM-317 adjustable voltage regulator supplies the drive signal to the bases of power transistor Q1 and Q2. Potensiometer R9 sets the output-voltage level. A current sampling resistor, R8 (a 0.1 ohm/5W unit), is connected between the negative output lead and circuit ground. For each amp of charging current that flows through R8, a 100mV output is developed across it. The voltage developed across R8 is fed to one input of comparator U3. The other input of the comparator is connected to variable resistor R10. As the charging voltage across...

This is an adjustable power supply circuit , also known as variable power supply. . You may use this circuit for general purpose usage. Here the schematic diagram : Component list: R1 = 560R 1/4W C1 = 100nF R2 = 1,2 K 1/4W C2 = 2200uF 35-40V R3 = 3,9 K 1/4W C3 = 100 pF R4 = 15K 1/4W C4 = 100uF/ 35V R5 = 0,15R 5W D = B40 C3300/2200, 3A rectifier bridge P1 = 10K potesiometer TR1 = BD 135 ...

This is variable power supply for multi purpose usage and very useful to supply your electronic tools or your projects. Voltage range will be 0.7 - 24V and the urrent limiting range is 50mA - 2A. Components: P1____________500R Linear Potentiometer P2_____________10K Log. Potentiometer R1,R2__________2K2 1/2W Resistors R3____________330R 1/4W Resistor R4____________150R 1/4W Resistor R5______________1R 5W Resistor C1__________3300µF 35V Electrolytic Capacitor (see Notes) C2_____________1µF 63V Polyester Capacitor D1,D2_______1N5402 200V 3A Diodes D3____________5mm. Red LED Q1___________BC182 50V 100mA NPN Transistor Q2___________BD139 80V 1.5A NPN Transistor Q3___________BC212 50V 100mA PNP Transistor Q4 _________2N3055 60V 15A NPN Transistor T1____________220V Primary, 36V Center-tapped Secondary 50VA Mains transformer (see Notes) PL1___________Male Mains plug SW1___________SPST Mains switch Notes: P1 sets the maximum output current you want t...

Here the regulated power supply circuit that will give you current output up to 20A depends the number of power transistor used in the circuit . You can build the box like this: here te schematic diagram : for further instruction, visit this page

This is a regulated dual polarity power supply (download schematic and pcb layout HERE ): The output of this circuit will be positif output(+), normal/ground output(0) and negative output(-). IC LM317 is used to regulate the positive output and LM337 is used to regulate the negative output. You should use TAP transformer for this circuit and heatsink for the IC. Please visit this page for complete explanation Another dual polarity power supply circuit, visit here