Variable-duty-cycle-timer
Posted on Apr 27, 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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This add-on device for telephones can be connected in parallel to the telephone instrument. The...
A simple test circuit to fault find audio and radio equipment. Can be used to inject a square...
A simple op amp and silicon diode are the heart of the temperature-to-voltage converter that will...
Here the simple mixer with 4 input and 2 op-amps: A basic mixer suitable for mixing microphones...
This circuit arose from the need of the author to provide a 5 V output from the 24 V battery of a...
When both S1 and R2 are on, current flows through each of the lamps, which are connected to the...
Here are instructions to turn such a tester into a not-so-precise analog display to monitor the...
One of my friends asked me if I could design a circuit for him to be able to remotely power up a...
This smoke detector circuit diagram is based on the SD2 CMOS Photo-Electric Smoke Detector...
We tested a regular charger and found that it consumed 13mA with no load. Like many others, it...
This mini Logic analyzer is a tool for you to watch on LCD the logic transitions 0 or 1 of a...
The CM-CU21 is a high quality, portable Commentator Unit. Its sturdy construction and flexibility...
Adapting one of my failed Tesla coils into a crystal radio set to show the neighborhood kids....
Circuit works: lC is a 555 IC. Incoming calls, 220 V electricity through R1 Buck, VD1 rectifier,...
CDI011 integrated circuits using sound, light control stairs delay switch circuit is relatively...
As shown for the voice-activated lamp circuit. The circuit consists of an operational amplifier...
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