Crystal checker
Posted on Sep 3, 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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The circuit consists of a variable current source that charges a capacitor, which is rapidly...
Transformer Tl can be any matching transistor type in the range of 500/500 to 2500/2500 ohms. No...
This Dummy Alarm project makes an LED flash briefly once every 5 seconds to imitate the indicator...
Field strength meter circuit is a very useful device for measuring the RF output of any...
SP6331 SP6333 SP6335 Quad ower Supervisory Circuits are a family of Microprocessor reset...
This chapter contains the description of a simple development board for the study of the 8051...
The IC is a quad 2 input "AND" gate, a CMOS 4081. These gates only produce a HIGH output, when...
We tested a regular charger and found that it consumed 13mA with no load. Like many others, it...
The present reference is a special application of current source IC Type LM334. It has a tiny...
This is a simple schematic which can be assembled to control a lamp with a Sony TV remote...
In the circuit shown, the special launch tube T2 and its peripheral parts form a high-frequency...
My particular favourite was the MC145152-2 that could be programmed with DIP switches, a diode...
The intelligent discussion of VHF systems requires a feel for VHF systems, and how VHF energy...
Shown for the automatic traffic intersection traffic light control circuit. Four monostable delay...
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