Stock dial telephone line power supply circuit diagram
Posted on Mar 28, 2007
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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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This is a description of an experimental AM receiver for VLF. It is crystal controlled to receive...
This circuit uses the CA3207 sequence driver and CA3208 segment latch-driver in combination to...
This circuit detects an object passing in one direction but ignores it going the opposite way....
The HllC supplies the de latching relay function and reverse polarity blocking, for currents up...
This circuit traps a single positive pulse from a square-wave train. Following the rising edge...
This is Infra-Red Remote Control Tester circuit. This circuit is used to test go/no-go of any...
The circuit is quite simple thanks to the use of MAX638CPA 5V CMOS Step Down Adjustable Switching...
Before we study the working principles of a TV receiver, it is worth knowing a little about the...
The cheap flashlight had a rather small (0. 22 Farad) capacitor for energy storage - not very...
The number 83 rectifier tube is a mercury vapor type rectifier that is designed to operate on a...
Here is the schematic of a simple flouroscent lamp driver circuit based on two transistors. The...
This project is almost useless, I want just to realize a pendulum that swings endless. Nothing...
The circuit is based on the PIC 16F877 microcontroller, see schematic in figure 4. The digital...
The 555 timer chip is a very versatile IC, because when connected correctly, it can it can create...
The Flash-based program memory is where the program sketch is stored after an upload. The SRAM...
As shown in FIG optical control circuitry for high-performance street. The circuit consists of a...
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