Power supply circuits diagram

LM723 power supply circuit

admin — Mon, 30 Apr 2012 19:02:21 +0000

Today I was in the storage room, I found an old electronic circuit boards, about the project a lot of power, especially the LM723 IC is used in many circuits.
It acts as a DC voltage regulator, in a linear, easy to use, it has been very popular in the past, even now I still use it.

Today we see the LM723 power supply to circuit in this together, I’ll see you next time to use it.

General purpose power supply with LM723 and TIP31 This general purpose power supply can e 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 positive side of filter capacitor C1 to ground. Potentiometer R2 sets the output voltage to the desired value by adjusting the reference [...]

L146+LM723 power supply variable regulator 0-40V 1A This is circuit variable voltage regulator power supply Adjustable Voltage Output 0-40V and Current 1A.(Max 1.3A) Use IC LM723 for control regulator output, P2 for Adjustable Voltage output 0-40V. Related Links Circuit Variable voltage Regulator LM723 power supply Top LM317 regulator regulator 1.25-30V 1A By LM317T(with PCB) Variable Regulator 0-30V 1A by IC 741 + [...]

Power supply regulator 0-50V 2A by IC LM723 + Transistor 2N3055 & BD140 & A671The Circuit power supply regulator 0-50V 2A by IC LM723 + Transistor 2N3055 & BD140 & A671 is nice Pwer supply, For all electronic user. You can Current control by VR 5K, LED5 For display OVERLOAD. To use transformer 3A, Transistor to Hold Heatsink. To adjust the output voltage< VR1 – 5K (VOLT CONTROL) OUTPUT [...]

5V to 12V dual polarity DC booster for op-amp IC circuits.

admin — Sun, 29 Apr 2012 05:39:26 +0000

My friends an email to ask for advice about the power of IC op-amps. From the power supply for digital circuits have only 5V.
??But the IC op amp will work well in the power supply of 12Volt, We have two sets, or +12 V, ground and-12V. I try to browse the collection, but the second circuits, as it looks is 5V to 12V dc converter
The output current is about 0.3A, which is sufficient to meet the needs of IC op-amps, of course. Take a look at this idea, I have a problem with my friends.

5VDC to +12V and -12V Isolated dual power supply

5VDC to +12V and -12V Isolated dual Switching Regulator with LM2587

3V power supply

admin — Fri, 27 Apr 2012 11:04:29 +0000

The most of My small electronic projects used a power supply 3 Volt, the following reasons.
1. CMOS digital integrated circuits used in this low voltage level supply source.
2. The op-amp IC circuit is also work very good.
3. The transistors circuits, SCR and other circuits. Which structures in the internal bias voltage is 0.7V and above up, so it can work well in this voltage range.
4. It can drive perfectly LED lamps.
5. and so on.
If you already know the advantages. For example, I suggest a better one.

3 volt car adapter by LT1074
This 3 volts Car Adapter circuit is based on a standard LT1074CT switching regulator IC. The schematic shows the LT1074CT used as a positive step-down or ‘buck’ converter. The ‘switcher’ is used to convert a +12-volt car battery voltage down to +3 volts for use with the personal hi-fi’s and handheld games for the author’s [...]

9V to 3V Step-Down Converter by LT1073
I want mini size switching regulator,so it input voltage 9V to 3V Step-Down Converter circuit. The LT1073 is good idea,it used for dc to dc converter. if want it,please read in http://www.linear.com . Vout 3V at 100mA, L1 100?H , D1 – Diode 1N5818 or equiv Detail more,please in image. Related Links Step down converter [...]

3V 3A Regulator Switching by LM2576
I build this project when I have a problem to driver stepping motor that draw current 3A at 3V.After search the infomation on the internet I have found LM2576-ADJ which is an adjustable output version of 3A Step-Down Voltage switching Regulator and capable of driving 3A load with excellent line and load regulation. You can [...]

0-30V power supply

admin — Thu, 19 Apr 2012 08:47:31 +0000

I like to build electronic projects,Using multi-level power supply from 1.5V to 24V.
I have a project to build a variable power supply 0-30V, several circuit is as follows.

Bench variable power supply 0-30V

Today I seeks variable power supply circuit come to deposit again. Which be the circuit that use base equipment, build not difficult follow the circuit can fine volt get 0-30V , give current get about 1-2A depend on transformer at you choose to use. The prominent point of the circuit use transistor join a pin [...]

2-30V 5Amp Power Supply Regulator With LM317,741,2SA1186 Here is Circuit power supply linear regulator. Volt output 2-30V and Current 5Amp. use IC LM317 regulator circuit for Circuit power supply Regulator and Transistor 2SA1186 for Boost up Current from IC LM317 (1.5A) to 5A output. Detail more read in circuit Related Links Circuit LM317 power supply circuit 0-30V power supply 5A regulated power [...]

0-30 VDC Stabilized Power Supply With Current Control 0.002-3A
0-30 VDC Stabilized Power Supply With Current Control 0.002-3A – This is a high quality power supply with a continuously variable stabilised output adjustable at any value between 0 and 30VDC. The circuit also incorporates an electronic output current limiter that effectively controls the output current from a few milliamperes (2 mA) to the maximum [...]

9V dc converter for 12V transformer-based adapter

admin — Fri, 23 Dec 2011 07:50:51 +0000

My neighbor gets an ADSL Router of ZyXEL P-660R form his friend.
However, he can not use it, for do not has a transformer-based adapter its that used is 9Volt at 1Amp, But he has only the 12V 2A.

He wanted to made the 12V to 9V converter circuit in the stable DC power supply form with some basic equipment

This circuit converts the power supply 12V, from a many sources such as battery 12V or the other, to the lower voltage output of 9V, and the maximum current at 2A.

In this circuit we use a plain components that easy to find and not expensive, the base of circuit are an op-amps(operational amplifier IC) uA741 and a power transistors 2N3055.

The NPN Darlington transistors (Q1-2N3704, Q2-2N3055) are used to boost up output current to 2Amp,and the 2N3055 can be hold with a big size heat sink as it very hot when used.

If we are short circuit or used a current over limit, this circuit is still usually. Because it has the Q3 stop automatically doing of Q1,Q2.

I think that this circuit is the way to solve your problem as well. Good luck.