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Yearly Archives: 2019

Simple metal detector

Simple and reliable metal detector If you have lost the ring, key, screwdriver … and you know the approximate place of loss, then do not despair! You can assemble a Simple metal detector with your own hands or ask a radio amateur friend  to assemble it. Below is a diagram of an easy diy and old metal detector that  can …

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GOLDEN MASK 4 pro

GOLDEN MASK 4 pro Welcome, dear readers , here we always try to collect more metal detectors that can be assembled at home, and publish useful information for metal detectors and exchange useful things. I found a new and good review to make a new modification of the metal detector called the Golden Mask Pro 4. We will publish here …

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Coil DD for induction balance metal detectors

Building the search DD coil for Induction Balance metal detectors The name of this Coil DD comes from the similarity between its two  parts (the receiver and sender coils) and each coil takes the form of the capital letter D, meaning that it consists of two coils (double) similar to the letter D. The layout of the components can be …

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The simplest frequency meter

This is probably the simplest frequency meter built on the ATtiny2313 microcontroller . It allows you to measure frequencies up to 10 MHz in four automatically switched ranges. The smallest range has a resolution of 1 Hz. Frequency counter specifications Band 1: 9.999 kHz, resolution 1 Hz. Band 2: 99.99 kHz, resolution up to 10 Hz. Band 3: 999.9 kHz, resolution up to 100 Hz. Band 4: …

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LC METER

In the world of radio amateurs, especially during repairs and building a new devices, you should have a device for measuring of capacitance and inductance, this device is called LC meter. Today, on the Internet, you can find many schemes of such devices, complex and very expansive. But you can create your own   LC meter. Almost all LC meter …

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Capacitor ESR measurement circuit (NE555)

Capacitors work without problems, but sometimes they encounter power failures or malfunctions. If the problem is noise, then there is a simple solution, just add more capacitors. But if that doesn’t work out, what went wrong? The root of the problem is that we take capacitors for granted as ideal devices, but they are not. These unexpected results are due to internal resistance, or equivalent …

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LM2596 regulated power supply

Considering that the efficiency of the LM317 regulator is low and the heat generation is important, it is intended to make a new adjustable regulated power supply . When you search on the website, You will find  many adjustable voltage regulators use LM2596 IC. Switching power supply, high conversion efficiency (more than 85%), small heat generation (heat is basically not sensed when …

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DIY simple obstacle avoiding car (diagram and source code)

DIY simple obstacle avoiding car This simple obstacle avoiding car uses ultrasonic waves for distance measurement and determines the direction of the car according to the measured distance. Simplified handling of obstacles avoiding, as long as there are obstacles, turn right. To save costs, only one ultrasonic wave module, so only objects in front of the obstacles avoiding. The car  …

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Universal Charger PIC16F877A

Universal Charger PIC16F877A The device Charger PIC16F877A  is made on a PIC16F877A microcontroller and C++ programming language, SDCC compiler. Able to charge most  known batteries with custom charge parameters. The display shows all the necessary information (current, voltage, time, mode). During the charge, the temperature is controlled. Principals and technical Specifications: Rechargeable batteries: NiCd, NiMh, LiPo, Li-on, LiPoly, SLA EEprom 256 …

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Pinpointer G-NOME 

Pinpointer G-NOME  After reading interesting articles about  metal detectors, I found this pinpointer based on a small but intelligent microcontroller integrated with chip ATtiny15L .The device is called pinpointer “Gnome-M” and helps to locate the metal accurately. The basic characteristics  and electronic diagram Simple and easy to build Sensitivity: on a small metal piece 4-5 cm, large metal body – …

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