Low Drop Out Regulator | Electronic Project Circuits

Posts Tagged ‘low drop out regulator’

12V input, 12V battery charger by 555,7815

The charger consists of two stages: The first is a capacitive voltage doubler, which uses a 555 timer IC driving a pair of transistors
connected as emitter followers, which in turn drive the voltage doubler proper. The doubler has power resistors built in, which limit the charging current.

BUY Lead Acid Battery Charger Electronic Module

The second stage is a voltage regulator, using a 7815 regulator IC. Its output is applied to the battery via a diode, which prevents reverse current and also lowers the voltage a bit. The resulting charge voltage is about 14.4V, which is fine for charging a gelled or AGM battery to full charge, but is too high as a trickle charger, so don’t leave this charger permanently connected to a battery. If you would like to do just that, then add a second diode in series with D3!

There is a LED connected as a charge indicator. It will light when the charge current is higher than about 150mA. The maximum charge current will be roughly 400mA.

Source:http://ludens.cl/Electron/12Vcharger/12Vcharger.html
Thank you.

Be the first to comment - What do you think? Posted by admin - January 30, 2008 at 9:48 am

Categories: Battery charger, Converter Circuit Tags: Converter Circuit, IC 7815, lead acid battery charger, low drop out regulator

5V Low Drop Out Regulator Low Volt by BD438

I have a 6V battery, but it needs to be applied to digital circuits that used to 5 volt regulated.
In first, I will reduce this voltage with a single resistor, but the load current is not constant.
The other way to use is a second, I would use 2 x 1N5402 diodes to connected in series to reduce the voltage to the load. But it don’t work because low current output.

I selected this simple circuit is the 5V Low Drop Out Regulator Low Volt. It used normal electronics part are transistors and resistors. While we can adjustable the P1 for control output voltage at current 500mA.

When the BD438 transistor Q1 is very hot, so the cooling pad. And we use numbers instead TIP3055 number 2N3055 (easy to buy all the time).

Be the first to comment - What do you think? Posted by admin - December 4, 2007 at 9:19 pm

Categories: Power supply Tags: 5v Regulated, low drop out regulator, Low-Volt, transistor power supply

Switching power supply dual voltage 5v and 3.3v by LM2575 LM1117

Here is circuit Switching power supply dual voltage, output 5V 1A and 3.3V 1A.
Use IC LM2575 SIMPLE SWITCHER 1A Step-Down Voltage Regulator ,and IC LM1117 is 800mA Low-Dropout Linear Regulator. Volt suppy 9V – 60V
Detail more see to image circuit.

Read more source: http://www.compsys1.com/support/docs/PWRLm25.pdf
Thank you