This circuit allows switching on a LED when the battery voltage (12V) drops below a certain threshold. The operating system is based on a comparison of tension, which comes in a zener diode. If the supply voltage is 12V and the zener diode is a 10V model (this is the case in the diagram), we [...]
The 78xx family is a very popular choice for many electronic circuits which require a regulated power supply, due to their ease of use and relative cheapness. When specifying individual ICs within this family, the xx is replaced with a two-digit number, which indicates the output voltage the particular device is designed to provide (for [...]
In this project Dilshan design an Inverter to convert 12V DC power source to 230V AC power. This system consist 3 main stages such as oscillator, switching circuit and step up transformer stage. In oscillator we use 4047 CMOS astable multivibrator to generate nearly 60Hz oscillation.
Source:Dilshan Download: Complete schematic and PCB diagrams
This is a automatic battery charger, after completing the charge it turns off automatically. It runs on AC power but you can also run it with DC power. Its not my idea or my invention, I got it from net. After understanding the circuit I built it and it works fine. So try to built [...]
One very important Part of a Tube Amplifier is the Power Supply. It is crucial for the quality of the whole system. Especially beginners encounter problems like Hum or Drift that can become quite annoying. But resue is ahead: The following circuit uses a modern Mosfet to deliver a stable and virtually Hum-free voltage to [...]
This mini-project is the main power-supply for the Valve Crunch/Tremelo floor pedal presented elsewhere on Connectable site. Since the PSU is a separate unit, and may be of use elsewhere I decided to document it apart from the pedal. The unit expects a 12v input at X1 – this was a cheap wall-wart in the [...]
This is the USB controlled Atmega8 microcontroller based power supply. Starting with the Visual Basic and IOCOMP software. FT232RL for the USB connection.
Source: Ben
The source has the following characteristics
• Tension of entrance: 220VAC
• Tension of exit: 0 to 25VDC with a current of 0 to 2.5A.
• Precision of the regulation
• Thickness: 1V/100mA
• Fine: 100mv/3mA
• Use of microcontroller PIC 16F877A of Microchip leaving available for the use 10 ports.
• Adjustment by means of pulsers and encoder mechanical or optician.
• [...]
By Talip Kiziltepe
email: talip_kililtepe@hotmail.com
Here is my 220v flash light circut i do try
very good working.
This circuit lets an external 12V SLA battery power a camcorder which normally has an inbuilt 7.2V battery. Such batteries can now be very difficult or expensive to obtain for earlier model camcorders.
In essence, the circuit is a standard LM317 adjustable regulator with resistors R1 & R2 set to provide 7.2V (depending on the accuracy [...]
This project allows instant start sequentially but a dozen low-voltage lamps 12 V / 60 W, and makes them fade and always sequentially (but slower). This system has been designed to meet the demand of a visitor who wanted ten recessed low voltage spot in a driveway to his house, with the following function: – [...]
This circuit allows switching on a LED when the battery voltage (12V) drops below a certain threshold. The operating system is based on a comparison of tension, which comes in a zener diode. If the supply voltage is 12V and the zener diode is a 10V model (this is the case in the diagram), we [...]
This is a good looking and practical device that can be useful in many areas where countdown timer is needed. This project is based on the PIC16F84A microcontroller. The time range can be adjusted between 1 and 999 seconds. This project has 3 buttons and one of them is named Set Button. In order to [...]
A VU meter is often included in audio equipment to display a signal level in Volume Units; the device is sometimes also called volume indicator (VI). In this project we are building a basic and low cost LED VU Metre circuit . The extent (range) display is -18 dBu to +3 dBu, spread over [...]
Today we have a new category “Projects” and a new electronic project 12 Channel LED Chaser with PIC16F84A.
This project is based on the popular PIC16f84A micro-controller.The heart of this project LED chaser is the PIC16F84A PIC microcontroller.A 4MHz crystal and capacitors C1 and C2 22pf is used for providing clock pulses to the micro-controller. The [...]
