Darkroom timer
Posted on Nov 12, 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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It can drive up to 128 individual relais, solenoids, motors, fireworks, pyrophones, etc. With a...
The GHF1 is a small generator covering the HF and LF band from 30 Hz to 30 MHz in 6 ranges. The...
The Elect. Sel. 8 is a simple circuit, with a choice of 8 sources of any sort ,of 8 independent...
This circuit will flash a super-bright LED (5000+ mcd). Good for fake car alarm or other...
This circuit uses readily available parts to implement a 0-to-200-nA current source. The circuit...
The I2C serial bus is a popular two-wire bus lor small-area networks. I2C Clock and Data lines...
The Visual Target Tracking System (VTTS) is a system for visually tracking targets using a gimbal...
You can experiment with the size of the coul and the number of turns to see how it affects the...
I accept acclimated a brace of BC548 transistors in this circuit. Although not carefully RF...
Crowbar circuits are so-called because their operation is the equivalent of dropping a crowbar...
A simple tool to check the degree of radiation from an electric or electronic instrument. The...
The LTC ®3525-3/LTC3525-3. 3/LTC3525-5 are high efficiency synchronous step-up DC/DC converters...
DK-5A, 5D, SDb control box, all with a thermal electromagnetic overcurrent release, the circuit...
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