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Archive for the ‘Audio diagram’ Category


 Class A headphone amplifier using TL072 low noise.

Tuesday, July 15th, 2014

We will use a Class A stereo headphone amplifier that is very good quality sound. Consists a low noise Op Amp ICs and 2 transistor as main so have very cheap and easy to build. It can increase all audio source such as CD player, the AM, FM radio or others. The many people like […]


 Refrigerator Door Detector Alarm

Sunday, July 13th, 2014

This is a Refrigerator Door detector alarm, it will detect light of lamp in the fridge and alert with buzzer. This projects is small size, easy to make and cheapest. It will alarm when Small child secretly eating candy or medicine stored in the refrigerator or sometimes forget to close the door is not closed. […]


 Rat and cockroach repeller circuit

Saturday, June 21st, 2014

This circuit is a rat and cockroach repeller which use principle of sound waves or ultrasonic cause they annoyed so it escaped away. This is small and cheap because use transistor (no ICs) and super loud since use large piezoelectric but use low current source. Technical information – Use power supply of 9 Vdc. – […]


 Cricket voice with buzzer using LM324

Wednesday, June 18th, 2014

This is a cricket voice circuit which is an another Sound effects generator byLM324 op-amp and emit by a buzzer. And they have sound similarly the crickets are singing a couple we’ve ever heard. In circuit we don’t use any microcontroller ICs so you can build easily them and also cheaper. Technical information – Use […]


 The 4 sound effect using UM3561

Sunday, June 15th, 2014

Here is a 4 sound effect that use one IC-UM3561 and a few parts only. It can make siren, Ambulance sirens, Police car sirens, Fire truck siren and Space Machine Gun Sound effect How it does works As Figure 1 is the circuit diagram. To begin with R1 is connected to pin 7 and pin […]


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