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.....
The circuit is drawn for measurement of acceleration from 1000 mg until + 1000 mg. It can be...
While I would have liked a 4 channel chip with about 20 Watt per channel, the local parts store...
This circuit utilizes an HA-5152 dual op amp and FET to produce a low-voltage, low-power,...
The Camera Head (A2075) is a LWDAQ Device that controls and reads out a single ICX424 image...
A continuously working wiper in a car may prove to be a nuisance, especially when it is not...
Here is a simple but inexpensive inverter for a small soldering iron (25W, 35W, etc) In the...
On many cars, the boot light will not go out until the lid is properly closed. It is all too easy...
The 7MHz CW transceiver made with MC3362P. I made a 7MHz CW transceiver by using the IC for the...
The NE568A( NE568AD NE568AN SA568AD SA568AN 0 is a monolithic phase-locked loop (PLL) which...
A simple triangle/squarewave generator using a common 1458 dual op-amp that can be used from very...
Circuits using large value resistor/capacitor combinations are not very accurate because of the...
The charging circuit stops automatically when the battery is fully charged. So you can leave the...
Consisting of two capacitors polarity as shown by ICL7660 and external power conversion. The...
DC-coupled single-tube amplifier (l) single-tube coupling the DC amplifier so-called single-tube...