Electronics Online

The following is a schematic diagram of a lamp brightness control. Lamp used is a light tube with a voltage 3V. You can replace the lamp with other lamp types, such as LEDs.

How the circuit works:
IC1 works to generate 150Hz square wave which having a variable duty-cycle. When potensiometer P1 is fully rotated towards D1, the output positive pulses appearing at pin 3 of IC1 are very narrow. Lamp LP1, driven by Q1, is off as the voltage across its leads is too low. When potensiometer P1 is rotated towards R2, the output pulses increase in width, reaching their maximum amplitude when the potentiometer is rotated fully clockwise. In this way the lamp reaches its full brightness.

These Nokia wiring diagram would be help you to fixing your own Nokia cell phone. The files containing almost of Nokia schematic diagrams / circuit diagram.

Visit this page of Nokia cell phone  diagram to download complete Nokia wiring diagram.

This is an high power RF amplifier circuit. With high power output, the FM signal will cover wide area. The manufacture of amplifier is very simple and easy.

Schematic Diagram:

Component Parts:
C1, C2, C3, C4 = 10 – 80pF
C 5 = 10nF
C6 = 1000pF
C7 = 100nF
C8 = 2200mF/35V
L1 1 = coil with diameter of 10 mms, 1 mm
L2 7 = coils with diameter of 10 mms, 0,8 mm
L3 3 = coils with diameter of 10 mms, 1 mm
TR1 = BLY89
RFC = RF tsok

Do you want to install the installation of lights in your house ..? If yes, then you should follow the procedures for installing the lights the following:

Wiring diagram:

You should look is the color of wires on the wiring diagram, if reversed in the installation of the cable then there will be a short circuit.

Spice is an analog circuit simulator which developed at the Electronics Research Laboratory of the University of California, Berkeley by Laurence Nagel. This is an open source software circuit simulator, you may try this software to simulate your circuit.

SPICE (Simulation Program with Integrated Circuit Emphasis) is a general-purpose open source analog electronic circuit simulator. It is a powerful program that is used in IC and board-level design to check the integrity of circuit designs and to predict circuit behavior.