FM Electrocardiogram Monitor with LM331/LM231
Posted on Jan 24, 2013
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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.....
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When an antenna is attached, (or even if not, in the presence of a strong RF field) the field...
This one-valve (ECL82) CW Transmitter occupies a very special place in my amateur radio history....
This simple circuit generates a dual-speed clock for personal computers. The circuit synchronizes...
This circuit uses only one JC, either 1, LM393 dual comparator or 1/z, LM339 quad comparator. RV1...
This circuit modulates the current through a lamp filament. Use a low-voltage lamp with a thin,...
This field strength meter consists of a tuned crystal detector producing a dc output voltage...
Usually keyboard is connected by using matrix type of connection a‚ rows and columns. For...
Usual already a bicycle has will no Light turning. If want to turn a car may be born dangerous...
Integrated AF power amps have seen great improvements in recent years offering improved power and...
If you ever thought of experimenting with pulse-width modulation, this circuit should get you...
The ISL6291 provides a low-cost integrated charger solution for single-cell Li-ion and Li Polymer...
Stepper motors are available in several versions and sizes with a variety of operating voltages....
The system consists of two parts: the Arduino board that detects the led pulses and sends the...
This stage adds the TX Mixer to the board and provides the modulation of the Dividers` output...
This circuit uses "and other potential triggers" Circuit. The so-called equipotential...
Another solution would be to improve the current feedback signal to an error amplifier summing...
As water heaters, microwave ovens and other heating equipment temperature control circuit;...
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