Auto Switch-Off Power Supply (Variable Output 3.7V to 8.7V)

Auto Switch-Off Power Supply (Variable Output 3.7V to 8.7V)
Here is the auto switch-off power supply which will turn off itself when there is no load on the output. The output voltage can be vary from 3.7V upto 8.7V. Although this circuit uses fixed-voltage regulator LM7805, but its output voltage is adjustable, thanks to a potentiometer installed between common terminal of regulator IC and ground. For every 100-ohm increment in the in-circuit value of the resistance of potentiometer VR1, the output voltage increases by 1 volt. Thus, the

15V 1A Regulated Symmetrical Power Supply

15V 1A Regulated Symmetrical Power Supply
This is the easy built 15V 1A regulated symmetrical power supply capable to deliver stabilized voltage of +15V DC and -15VDC. The maximum current output is about 1 ampere up to 1.5 ampere refer to the datasheet. The circuit uses IC regulator LM7815 for positive voltage and LM7915 for negative voltage. To obtain different voltage output, just replace the IC regulator LM78xx and LM79xx, the xx code is the output DC voltage value. (more…)

12V / 3A Regulated Power Supply

12V / 3A Regulated Power Supply
Here we provide a powerful 12V / 3A regulated power supply circuit. Of course the circuit provides a 12V regulated power supply with output current up to 3 amperes. It is specially designed for use with 2m handheld rigs with linear power amplifier and CB portable QRP rigs. The power supply circuit uses monolithic IC CA3085 voltage regulator in 8-lead TO-5 package. Its salient features include good load and line regulation, output current up to 100mA (which can be

Bench Power Supply Adjustable 1.25V-15V and Fix 5V

Bench Power Supply Adjustable 1.25V-15V and Fix 5V
This is bench Power Supply give you three types of voltage output that are adjustable 1.25V-15V / 1A positive voltage, adjustable 1.25V-15V / 1A negative voltage and Fix 5V 3A positive voltage. The regulator circuit in this bench Power Supply consists of a LM-317 integrated circuit. This IC is specially designed to perform the regulation function. Figure 6 shows a simplified circuit of how the LM-317 IC works. (more…)

1.2V – 57V Regulated DC Power Supply Circuit

1.2V – 57V Regulated DC Power Supply Circuit
This is the circuit diagram of multi purpose regulated dc power supply which featured with short circuit protection. The electronic workshop is necessary to have a source capable of providing any voltage and sufficient current within an acceptable range of possibilities. This circuit goes beyond conventional sources (which rarely exceed 24V output) giving a maximum of 57V with a current of 1.5A. (more…)

1.5A Negative Adjustable Power Supply

1.5A Negative Adjustable Power Supply
This is the circuit diagram of negative adjustable power supply based LM337T. This circuit can be used for devices which required negative supply to work. The regulator LM337T is capable of supplying 1.5A over an input voltage range of 1.2V to 37V. They need at least a 2.5V input-output voltage differential. In practice the limiting factor on the output voltage & current will be the power dissipated by the regulator. For example, if the input voltage is 30V &

Triple Output DC Power Supply

Triple Output DC Power Supply
This is the circuit diagram of triple output power supply. The output given are: Adjustable output +1.25V to +20VDC Splited / dual polarity output +12VDC and -12VDC Splited / dual polarity output +5VDC and -5VDC This is a low-cost and easy built power supply for multipurpose usage. It fulfils the requirements of almost all laboratory experiments. (more…)

1-15V DC Digital Power Supply with 15 Steps

1-15V DC Digital Power Supply with 15 Steps
This is a simple digital power supply circuit diagram to obtain variable DC voltage from 1.25V to 15.19V in reasonably small steps. The steps of up and down voltage can be down by press the up and down switch, and it use LED indicator to show the level of the output voltage. You can use DC input voltage between 20V and 35V. You must prepare a DC power supply before built this circuit. (more…)