Category: Basic Electronic Projects

Here is a simple project called earth quake alarm circuit. This circuit is divided into two sections. Geo mechanical detector (Earth quake sensor) Alarm circuit The earth quake alarm circuit is based on the principle that earth quake create slow and suddenly vibration. In order to detect this vibration geo mechanical detector is used. The construction of geo mechanical detector is shown in figure 2. Alarm Circuit | Earth Quake Alarm Circuit The alarm circuit is built around dual input, 4 NAND IC (CD4011) and a NPN transistor. Input of…

Introduction to Luggage Security System Number of thefts and robbery has increased to a greater extent. Unemployment, poverty might have been the cause for this but still stealing others property is a serious crime. The only way to stop this is by alerting people themselves with proper security arrangements. Bus hijacking is what we heard commonly of, this is where the fear of crime lies. We have seen people stepping ahead for protection, they use chains, lock as security arrangements to secure their luggage. This might be a nice try,…

No matter how far we try to escape from pest’s trap or we attempt to clean the surrounding around us, we get eventually bothered being followed everywhere from kitchen to every corners of our house. Different pest repeller circuits have been developed claiming to escort people through this problem. However, pest repeller circuits thus built are found to have low power output resulting poor effectiveness. And, this error gives no solution to our trouble. With this point as our main concern, we have presented a powerful pest repeller circuit that…

In order to measure the RMS voltage between two specific points, employing heavy and bulky electronic devices sounds unusual. And, therefore a small handy instrument can be used to avoid such situations where the voltage (i.e. RMS) between two points at any distance; large or small can be determined. For this reason, the instrument RF probe circuit has been proven of great help for home users as well as for communication equipment service/design labs. Description and Working of RF Probe Circuit RF probe circuit is just an instrument to measure, in…

This electronic project, Add on Device For Telephone has multiple applications when used with the telephone lines. Since it is added parallel on the telephone system, it is called add-on device. The circuit add on device for telephone supports three modes of operation: on-hook, off hook, and ringing modes. It also provides the audio-visual indication of these operations. Using the relay, add on device circuit can connect the telephone to a CID (caller identification device). It can also be used to indicate tapping or misuse of telephone lines with the…

Metal detector is a device which is used to detect metallic object like metal coins, iron ore, aluminum or silver and gold etc. Here, we teach you how to make a metal detector circuit with which you can hunt hidden treasure. This simple metal detector circuit can also be used to detect buried cable or concealed wiring. You can also checkout metal detector using arduino. Description of Metal Detector Circuit This metal detector circuit is designed using three NPN transistors, IF transformer, search coil and few passive component. The metal…

Replacement of burnt LML vespa flasher costs around $ 2.5. The flasher can be replaced with the help of the circuit sows here. It costs around $1.2. Circuit Description of LML Vespa Flasher The circuit of LML vespa flasher consists of a multivibrator built around transistors T1 and T2. The time period of the pulse can be varied by changing the values of R1, R2, C1 and C2. The values shows in the circuit are chosen to match the flasher with the flashers available in the market. Gates of TRIAC…