Telephone Line Tester Circuit
Posted on Mar 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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Useful for liquids level detection and proximity devices Up to 50 cm. range, optional relay...
The circuit was designed to work with an audio power amplifier which operated off +18v-0v-18v...
Front and rear fog lamp schematic of Daewoo Korando shown in the following figure. It shows the...
This is a simple form circuit for a 2-station intercom using common 8R mini speakers. The...
One problem this causes is that the lovely USB port that I have been using to communicate with...
The circuit as shown in the figure employs 14 bi-colour (red and green) LEDs having three...
The electret microphone has a current of 200uA which changes by +- 3 uA depending on sound waves....
This article was previously published at, but I`d like to spread the idea further, possibly...
The heart of the circuit is IC2, a 50240 top-octave generator. That device uses a single...
Open Loop Speed Control of a DC Motor via 8255 Digital I/O Controller chip using TCP/IP...
This chapter contains circuit diagrams for several power supplies for pulsed solid state lasers....
As shown for the capacitor, the frequency detecting circuit transistor line. Can be converted by...
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