FM Electrocardiogram Monitor with LM331/LM231
Posted on Jan 24, 2013
New Circuits
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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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These circuits provide overvoltage protection in case of voltage regulator failure or application...
This device prevents paper notes and memos from being overlooked. A paper note placed between...
The circuit diagram shows the original Kodax MAX Flash Unit including the semiconductors that...
Just connect 22k fixed resistors across each transistor base and ground and then you may connect...
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Sealed-lead-acid batteries, which find wide use in power-electronics products, such as UPS...
The LM1279 is a full featured and low cost Video Amplifier with OSD (On Screen Display). 8V...
This circuit uses an LM2917 frequency to voltage converter. The input was connected to the low...
The medical ultrasonic atomizer circuit is composed of power supply circuit, ultrasonic...
Infrared reflective burglar alarm, infrared detection using reflective components (maximum...
CDI011 integrated circuits using sound, light control stairs delay switch circuit is relatively...
A sense of three-point oscillator, also known as Hartley oscillator, the Colpitts oscillator with...
As shown thyristors - linking arm rectifier module three-phase half-controlled bridge rectifier...
BA3884 DC operating voltage of 5.4 ~ 12,3V, its internal circuit principle and application...
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