RS232 cable modem
Posted on Jun 17, 2012
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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The circuit comprises a 3-stage resistor-capacitor coupled amplifier. When ring button S2 is...
The pulse repetition rate is relatively insensitive to temperature, and power supply voltage and...
This simple circuit generates a dual-speed clock for personal computers. The circuit synchronizes...
This circuit could be used as a treble control circuit with high frequency gain occuring when R3...
How do you make an LED turn on when it gets dark. You might call it the "nightlight problem, "...
This is a circuit that can be used for detecting sounds and providing an output signal when a...
This is circuit that first introduced by Signetics Corporation as the SE555/NE555 about 1971. Pin...
The 555 can be used as an amplifier. It operates very similar to pulse-width modulation. The...
This circuit was designed as an aid in parking the car near the garage wall when backing up. LED...
As you are probably familiar, an accelerometer is a device that can measure dynamic acceleration...
A portable CD player, radio, cassette player, a couple of microphones and PC sound card. I am...
This is a simplified version of the Universal Keypad-Operated Switch. I have modified the design...
It uses the HL-169B-type voice alarm IC A. It can be used for safe, glass doors, car doors and...
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