Water Level Alarm

Components:

                Resistor                : R 150k

                Capacitor             : C1 0.005 µF

                                            : C2 0.01 µF

                Transistor             : TR1 BC108

                                            : TR2 2SB 178

                Speaker 2 Inch/5 ohm

Water level alarm can be used to knowing the surface of the water in water container or water Toren. If water in the container touched the sensors so the alarm will make a sound. This sound is notification when water container was full and you can turn off the water pump.

The amplifier circuit High Tone (Treble)

Components:

Resistor                                : R1 150k

                                            : R2 470k

                                            : R3 2k2

                                            : R4 10k

Potensiometer                      : RV 10k tipe A

Capacitor                             : C1 0.05µF

                                            : C2 0.47µF 

                                            : C3 3n3F

Transistor                             : Tr1 BC 108

If your sound system or amplifier treble tone was already weak, you can create a circuit like the picture on the side. In this case the OUT channel can be connected directly with loundspeaker.

Super Filter

Components:

            Resistor                                        : R1 30 ohm

                                                                : R2 27k

                                                                : R3 1k

                                                                : R4 10 ohm

                                                                : R5 1k

Potentiometer                               : VR 1k

Capacitor                                     : C1 1000 µF / 50V

                                                    : C2 1000 µF / 50V

                                                    : C3 1000 µF / 50V

Transistor                                     : TR1 2N3054

                                                    : TR2 2N3054

Super filter is very suitable used to muffle the noise from power supply. With super filter you can muffle noise until 1:1 and this series must install before strengthener connecting structure.

Factory Siren

Components :

                Resistor            : R1 6k8

                            : R2 100k

                            : R3 3k3

                            : R4 22k

                            : R5 1k

Trimpot                : RV 1k

Capacitor             : C1 4.7µF/10V

                            : C2 0.1µF/15V

Transistor             : Tr1 FCS 9013

                            : Tr2 FCS 9012

SCR                     : MEU 21

Speaker                8Ω 4 inch

This circuit is a siren tone generated by tone generator that generated by the two transistors TR1 and Tr2.
With about 500-100Hz frequency will produce an excellent sound sirens are used as signs began to come to work and marks a break from an office or factory. 

Power Supply Regulator 0-15V

Components :

                Resistor                    : R1 100k                              : R5 1ohm

                                                : R2 1k2                                : R6 1ohm

                                                : R3 4k7                                : R7 0.5ohm

                                                : R4 100ohm

                Trimpot                    : RV1 15k

                                                : RV2 1k

                Capacitor                 : C1 2200 µF /25 V               : C4 1000 µF /25 V

                                                : C2 200 pF                           : C5 2200 µF /25 V

                                                : C3 300 pF                           : C6 50 pF

                Diode                       : D1, D2, D3, D4 K01

                                                : D5, D6, D7, D8 WO 01

                                                : D9 IN4001

                Transistor                 : TR1 2N3053                       : TR3 2N3055

                                                : TR2 TIP 29                         : TR$ 2N3055

                IC                            : MC 1466L

                Fuse                         :1 A

                Coil                          : 100mH

If you need volt tension from 0-15 volt, try to make this device from picture. You must have voltmeter and ampermeter. You can control voltation do you want from power supply regulator 0-15V

Rat repellent

Rat repellent

Components :

Resistor                             : R1 1k8

                                         : R2 5k6

                                         : R3 1k2

                                         : R4 100Ω

Capacitor                          : C1 10µF/16V

                                         : C2 22µF/16V

IC                                     : NE 555

Transistor                          : Tr1 2N 4355

Speaker 2Ω 2inch

Such settings it sounds weird, but it was so. This circuit is a circuit that can generate oscillations generated by the components of IC and transistors so as to produce sound with a frequency of 50KHz is quite deafening and at the same mice away.

Simple Amplifier 2 Watts

Components:

IC                                        : LM 380

Capacitor                             : C1 10µF/16V

                                            : C2 0.1µF/16V

                                            : C3 470µF/16V

Speaker 8Ω 2 Watt

Only by using an IC type LM 380 and some capacitors you can make an amplifier circuit (amplifier) with the simple power of 2 watts and its components are easily obtained with a relatively cheap price.