Beeper Buzzer Circuits
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In the circuit, N1, N2 constitute the RS flip-flop, and the trigger end is pin 8 and 13; N3, N4 form the controlled oscillator, only when N3`s pin 1 is high, the oscillator works. When the finger touching pad TP1 is bridging, N1 output`s pin turns to high.... -
General purpose hobby circuit of a simple light fence security beeper is presented here. This circuit can be used as a door alarm, gate alarm, pathway alarm, etc. Any 12 Volt dc power supply can power the whole circuit.Working of this circuit is straight.... -
This easy electronic buzzer circuit built based on timer works for gaining the frequency. The IC timer NE 555 used as astable multivibrator operating at about 1kHz and produces a sound when switched on. The sound frequency can be adjusted b....
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
This transmitters' intended purpose is for morse-code only in the 30 meter band (10Mhz). It is a...
A relaxation oscillator is used to flash an LED in the base circuit. Cl is charged slowly through...
The circuit is based on operational amplifier IC1 used in the noninverting amplifier mode. Rl and...
A diode (IN4148) is used as a temperature sensor. IC2 is an A/D converter with BCD output. A refere
Let`s construct a low-power FM transmitter using surface-mount devices (SMD) that will be...
This circuit is a stable frequency counter accurate to 5 significant digits. The range is 0 -...
This ISP Programmer can be used either for in-system programming or as a stand-alone spi...
The purpose of this project was to be able to monitor the power consumption at my house. In...
The STK672-050 is a unipolar constant-current chopper- type externally-excited 4-phase stepping...
This circuit, which was developed to monitor the traffic of bumblebees in and out of the hive,...
The oscillator based on IC2 is responsible for producing the sound. Its output is connected to...
The operation control circuit mainly by the button switch SB21. Contactor KM1 composed contactor...
Circuit shown in Figure 3-92. It uses dual-phase sequence protection relay sense. When the power...