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.

The lamp LP1 could be one or more 1.5V bulbs wired in parallel. Maximum total output current allowed is about 1A.
R2 limits the output voltage, measured across LP1 leads, to 1.5V. Its actual value is dependent on the total current drawn by the bulb(s) and should be set at full load in order to obtain about 1.5V across the bulb(s) leads when potensiometer P1 is rotated fully clockwise.

Circuit source: redcircuits.com

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.

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
PCB Layout:

30W FM transmiter pcb layout

Circuit characterictics:
Tendency of operation: 18V
Current of Collector: max 3 5th
Gain: max 10dB
Force of Expense: 25-30 W
Output (order C): > 60%

Source: http://www.high-voltage-lab.com/81/linear-fm-30watt
Visit the web for detailed explanation abaout this FM Radio transmiter.

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.

Picture above is the wiring diagram for single pole light switch. For the installation of one light that can be controlled from multiple locations, please visit this page.

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.

SPICE became popular because it contained the analyses and models needed to design integrated circuits of the time, and was robust enough and fast enough to be practical to use. Precursors to SPICE often had a single purpose: The BIAS program, for example, did simulation of bipolar transistor circuit operating points; the SLIC program did only small-signal analyses. SPICE combined operating point solutions, transient analysis, and various small-signal analyses with the circuit elements and device models needed to successfully simulate many circuits.

Read more about SPICE at wikipedia

About TDA1910:
The TDA 1910 is a monolithic integrated circuit in MULTIWATT® package, intended for use in Hi-Fi audio power applications, as high quality TV sets. The TDA 1910 meets the DIN 45500 (d = 0.5%) guaranteed output power of 10W when used at 24V/4W. At 24V/8W the output power is 7W min.

Download the TDA1910 datasheet

If you really want to make an inverter, there is nothing wrong if you study the document first before you proceed further.

This document was created by Electronic’s Department of Northern Alberta Institute in of Technology.

Download the document here

Note:

• This circuit using splitted power supply, please see the IC datasheet for the recommended power supply voltage.
• Use heatsink on the chip to prevent over heating.

Download the power IC STK4231II datasheet

Schematic diagram:

Component Part list:

PCB Layout:

Component placement:

Download STK465 datasheet

Schematic diagram:

PCB layout design:

Split power supply:

Here the TDA2040 datasheet, use this database for your project reference.