Circuit Projects

Electrical/Electronics Blogger

Cell Phone Detector

This is a mobile phone sniffer circuit that can detect the signals being used in the GSM (Global System for Mobile Communication) band at about 900 MHz. Since the signals are digitally encoded, it can detect only the signal activity, not the speech or the message contents. A headphone is used to hear the detected signals.
Figure:1 Figure:1
Tags: cell phone, detector

PIC and EEPROM Programmer

In this project we are building a JDM programmer that can handle PIC12, PIC16 and PIC18 family microcontrollers and some popular 24C family EEPROMs.
Figure:2 Figure:2 Figure:2 Figure:2
Tags: EEPROM, programmer, PIC Microcontrollers,

300 Watt MOSFET Real HI-FI Power Amplifier

My passion for excellence progressed over the past 40 years to developing sonically superior amplifiers to the highest possible standards, providing life like sound performance.
Tags: MOSFET, HI-FI, power, amplifier,

Digital Voice Record and Playback Project by ISD2560P

This project is based on ISD2560P IC which allows you to record 60 seconds voice and then playback it with very high quality.
Figure:4 Figure:4 Figure:4 Figure:4
Tags: Digital, voice, record, playback,

Electronic Fuse for DC Short Circuit Protection by BRX46

This is an electronic fuse that protects the load against short circuit.
Tags: electronics, fuse, DC-DC Converter design, short circuit,

PWM Fan Controller by LM2902N or LM324N

This circuit is a fan controller which is using the pulse width modulation (PWM) method. It is tiny (33.78mm x 54.76mm) and easy to build. Functions of the circuit parts are listed below;
Figure:6 Figure:6
Tags: PWM, fan controller,

LM3886 Gainclone 2x68 Watt Full Amplifier Project

In this application, we are building a gaincard like amplifier. This application type is named gainclone in the audio world. To take a satisfactory audio response, we are adding a Linkwitz equaliser to the feedback line and adding bass compensation also.
Figure:7 Figure:7 Figure:7 Figure:7
Tags: LM3886, gainclone, watt, full, amplifier

Electronic Thermometer Project by LM35 and LM3914

As shown in the schematic, temperature sensor of our electronic thermometer is LM35DZ. There are some kinds of LM35 IC, since it is cheap and easy to find we used LM35DZ in our project. It measures from 0°C to 100°C with a very linear output graph.For one degree change, it increases its output 10mV.On theElectronic Thermometer Schematic other hand, this circuit measures temperature values only between +10°C and +39°C.
Figure:8 Figure:8 Figure:8
Tags: electric thermometer, LM35,

Low Cost 2x20 Watt Stereo Amplifier by TDA2005

This circuit is a small stereo amplifier for all suitable applications like amplifying small speakers, boxing, etc. It is also suitable for car use but before, the power supply must be choked with at least 150mH and it must give up to approximately 6 to 7 amps during the upstream performance.
Tags: stereo, amplifier, 20 watt,

Frequency Counter by PIC16F628

In this project we are building a basic and low cost frequency counter circuit . It can measure from 16Hz to 100Hz signals with a maximum amplitude of 15V. The sensitivity is high, the resolution is 0.01Hz. The input signal can be a sine, a square or a triangle waveform.
Figure:10 Figure:10 Figure:10
Tags: frequency, counter
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