Archive for category: Power Supply circuits

+/-12V Dual Power Supply

Power Supply circuits | By: Diagram mania

This project is a solution to power up most of devices or projects requiring dual (+/-12V) power supply. Description Symmetric +/-12 VDC power supply has been designed for audio applications, can power up microphone pre-amplifier, audio buffers, audio mixer, distributions amplifier, headphone amplifier, VU meter and few o other equipment or projects required dual supply. […]

Dual Adjustable Power Supply

Power Supply circuits | By: Diagram mania

This project is a solution to power up most of devices or projects requiring dual (+/-) adjustable power supply. Description The circuit is based on LM317 positive and LM337 negative voltage regulators. LM317 series of adjustable 3 terminal regulator is capable of supplying in excess of 1.5A over a  1.2V to 30V DC output range, […]

0-30V Laboratory Power Supply

Power Supply circuits | By: Diagram mania

This project is based on the 0-30 VDC Stabilized Power Supply with Current Control 0.002-3 A and a new PCB layout is introduced here. It’s a stabilized power supply with variable output voltage in the range 0-30Vdc (33Vdc peak) – and variable current 3A and is ideal for your laboratory power supply. Description Schematic and […]

HV Nixie DC-DC Switching Power Supply

Power Supply circuits | By: Diagram mania

Nixie tubes need about ~180Vdc to light up and thus on most devices a DC-DC converter is needed. We designed here a simple DC-DC switching regulator capable of powering most of Nixie tubes. Description The module is based on the MAX1771 Step-Up DC-DC Controller. This controller works up to 300kHz switching frequency and that allows […]

Variable Power Supply with LM7812

Power Supply circuits | By: Diagram mania

This project is a simple variable power supply using the famous LM7812 regulator IC. It consists of two boards, the main board which includes the regulator, capacitors, bridge rectifier and potentiometer and a second board that includes the mains tranformer, the fuse and a switch. Description I designed this variable power supply which is based […]

Power Supply Short Circuit Protection

Power Supply circuits | By: Diagram mania

  Description This circuit designed to be used with: 0-30 Vdc Stabilized Power Supply With Current Control 0.002-3 A Components values are shown in shematic. Connect 741 +Vcc to D1 anode in main circuit Connect 741 -Vcc to D3 catode in main circuitU1 needs a 5v +Vcc connect pin 4 of U1 to 5v Please […]

1.2 – 36V / 5A Adjustable Power Supply

Power Supply circuits | By: Diagram mania

Description This is a very simple and adjustable voltage power supply. Max input voltage is 37V and output adjustable between 1.2 to (vcc – 3) volts. Q1 is a power PNP Darlington transistor and is used to boost current of  LM317. It’s the most useful adjustable regulator and for this circuit you can also use LM317L […]

Digital Multiple Voltage Power Supply

Power Supply circuits | By: Diagram mania

Description This is simple to build microcontroller controlled power supply that can switch between 5 (or 32 or more) preconfigured voltages between 1.2 to 33 volts dc and up to 3 amps. This guide will walk you through every aspect of the building process; however some basic familiarity with electronics and microcontrollers will be required […]

9 Volt 2 Ampere DC Power Supply Circuit Diagram

Power Supply circuits | By: Diagram mania

9 Volt 2 Ampere DC Power Supply Circuit Diagram Circuit Description There is little to be said about this circuit. All the work is done by the regulator. The 7809 can deliver up to 2 amps continuous output whilst maintaining a low noise and very well regulated supply. The circuit will work without the extra […]

Adjustable 1.3-22V Regulated Power Supply

Power Supply circuits | By: Diagram mania

Adjustable 1.3-22V Regulated Power Supply Circuit Description Want a regulated voltage that can be adjusted to suit your application? This Adjustable Power Supply is small, easy to build and can be adapted to produce a fully regulated voltage ranging from 1.3V to 22V at currents up to 1A. This circuit come from SiliconChip Magazine There […]