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This is the Cheap and Simple Gate Alarm Circuit Diagram. A cheap and simple gate alarm made from a single CMOS Integrated Circuit.    Cheap and Simple Gate Alarm Circuit Diagram Circuit Notes Figure 1 represents a cheap and simple Gate Alarm, that is intended to run off a small universal AC-DC power supply. IC1a is a fast oscillator, and IC1b a slow oscillator, which are combined through IC1c to emit a high pip-pip-pip warning sound when a gate (or window, etc.) is opened. The circuit is intended not so much to sound like a siren or warning device, but rather to give the impression: "You have been noticed." R1 and D1 may be omitted, and the value of R2 perhaps reduced, to make the Gate Alarm sound more like a warning device. VR1 adjusts the frequency of the sound emitted. IC1d is a timer which causes the Gate Alarm to emit some 20 to 30 further pips after the gate has been closed again, before it falls silent, as if to say: "I'm more clever than a simple on-off devic...

Cheap electronics component for amplifier application, it is simple to be made for speaker active . The sound quality even this  Mini Amplifier TDA2030 quite satisfactory for a portable audio system. "The series of Mini Amplifier TDA 2030 "The series of mini amplifie can reproduce the power output of 14 Watt with 8 Ohm speaker load. The series of mini-amplifier can be supplied with ource voltage of 12 volts - 15 volts DC. more details, see the following series of pictures. Daftar komponen Resistor: - R1: 150KΩ - R2: 4.7KΩ - R3: 100KΩ - R4: 1Ω 1W - RA/RB: 100KΩ Capacitor - C1: 1µF / 25V - C2: 2.2µF / 25V - C3: 100nF - C4: 22µF / 25V - C5: 100 µF / 25V - C6: 220nF - C7: 2200µF / 35V IC / Dioda - IC1: TDA2030 or TDA2030a - D1/D2: IN4002

This is the very simple and Cheap cost Universal charger for NiCD - NiMH batteries Circuit Diagram. This circuit is ideal for car use. It has ability to transform a mains adapter for the charger. This can be used to recharge cell phones, toys, video batteries, MP3 players, ... and is selectable charging current. A LED is located in the circuit to indicate charging. Can be built on a breadboard or a general purpose PCB. Hope you like it. Universal charger for NiCD - NiMH batteries Circuit Diagram Parts: R1 = 120R-0...5W R2 = See Diagram C1 = 220uF-35V D1 = 1N4007 D2 = 3mm. LED Q1 = BD135 J1 = DC Input Socket Specifications: Ideal for in car use. LED charge indication. Selectable charge current. Charges Ni Cd or NiMH batteries. Transforms a mains adapter into a charger. Charge cellular phone, toys, portables, video batteries … Features: LED function indication. Power supply polarity protected. Supply current: same as charge current. Supply voltage: from 6.5VDC ...

Indeed , this amplifier is suitable known as the title above. Viewed from the schematic alreaady seen that this amplifier circuit requires little components and parts were cheap. This amplifier requires 1 piece of IC TA7368P is manufactered by TOSHIBA is the price too low, then in addition to IC amplifier requires 3 components elco capacitor whose value is not too big. Maybe if you make this amplifier circuit, the total price of all must not be more than $ 1. This amplifier only has more than 1W output, perhaps because it has little strengthening it so that the output is released is very small. But to make this is quite easy and not too costly. Part List : Capacitor C1 = 100 uF C2 = 100uF C3 = 470uF IC IC1 = TA7368P Good Luck :)