Three-minute-timer
Posted on Oct 14, 2012
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.....
.
It's a very simple circuit, for the follow-up of baby. It can however be also used for other use,...
Meter Ml, a +/-50-uA zero-center D`Arsonval meter movement is driven by Ul, a TL081 FET op amp,...
The LTC ®6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to...
There is something to be said for the processes of reducing a set of objects or functions down to...
This project consists of a small, portable DJ mixer powered by a 9V dc external supply adaptor or...
The system adopts the modular design, the one-chip computer AT89S52 and CPLD is CPU of the...
Circuit This circuit was designed to assist the installation of TV antennas. The signal is...
A typical, low cost, FSK Modulator TA0038 is implemented by injecting the modulation voltage into...
This circuit is used to measure the voltage on a 12V (nominal) lead acid rechargeable battery...
Ever since I built a MythTV, I have been able to eliminate my DVD and VCR remote controls....
Sensitive low-current relay coils often operate at much lower voltages than their typical...
The chassis is made of aluminum L-profile (30x30x2 mm) and the candles are made of 13 mm aluminum...
characters left: