Here is another little circuit I designed for radiation logging purposes. It is based on an Atmel 168 Microcontroller and a small and precise RTC device called RV3029. I also used an AT45DB41 Dataflash for this Circuit, as I had the sourcecode for communicating with this device already written. This is a very compact design that uses a modern LND7
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12 counter Tube. This kind of tube is also widely used in modern commercial geiger counters, and its alpha sensitivity is also a very nice to have feature. The only drawback is its price, I paid around 100 Euros for it. The high voltage generation is done by a nice little circuit I found in an application note provided by Maxim. It is a very efficient Low Power Design that only draws several microamperes. The onboard RTC can provide very flexible Timing and Alarm Signals, the Atmel external Interrupts INT0 and INT1 are connected to the RTC to make use of this feature. The power consumption of this circuit is very low when using the Power reduction modes of the Atmel controller. Depending on your program, it can be as low as several 10 microamperes. So this circuit is ideally suited for standalone long term measuring of radiactivity. Other sensors can be easily connected by using the I2C protocol, so this board is also a very good starting point for your own Ideas.
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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