Automatic telephone answering and ringtones indicator circuit diagrams
Posted on Mar 28, 2007
New Circuits
-
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.....
.
The precision input characteristics of the HA-5147 help simplify system error budgets, while its...
This circuit operates in the astable mode and at the end of the first period (up to several...
Below are three examples of controlling a relay from the PC`s parallel printer port (LPT1 or...
The mobile robot should run under the unknown and uncertain environment, must possess autopilot...
In typical push-pull driver applications, the npn-pnp transistor pair is alternately turned on...
The chips include an ATmega88 as the main controller, an AD9280 ADC, an LM6134 high-speed quad...
This timer circuit is similar to the 5 to 30 minute timer except that when switch S1 is closed,...
The ISL6528 provides the power control and protection for two output voltages in high-performance...
Transformer OCL and capacitor C1 form a tank circuit, to which are coupled sufficient turns to...
A simple IF AGC signal over a wide dynamic range and excellent linearity characteristics, it may...
Circuit shown in Figure 3-108. SB3 for the forward button; S Island reverse button; SBi as low...
characters left: