MOSFET-BASED PREAMPLIFIER FOR FM RADIO Project

FM transmissions can be received within a range of 40 km. If you are in fringe areas, you may get a very weak signal. FM DXing refers to hearing distant stations (1500 km or more) on the FM band...

The Millipede Project

Me and a friend are both trying to build a millipede. Because of obvious reasons, the millipede is NOT going to have 1000 feet!!! Instead, it's going to have 16 pager motors as feet. It will also...

Auto Fade Implementation on Audio Signals Project

Overview The circuit was designed to create an auto fade circuit that will be used to provide a mechanism of bringing the voice on top of playing music. Terminology TL072 – a low noise JFET input...

Design Parallel Port Interface Project

The following schematic shows the design of a Parallel Port Interface Circuit Diagram using 74HCT373. The 74HC/HCT373 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky...

Voltage to Current Convertor using LM723 Project

This Circuit converts a voltage control output from a Process Controller to be converted into a Current Control if the AC-Drive or Valve needs a Current Control Signal. This is a three wire voltage...

Two transistor AM radio Project

This two transistor AM radio circuit is also called “mini-radio”. It uses only 2 transistors and few passive components which makes is very easy to be constructed. Although the circuit is very simple,...

4 order filter with a single IC project

Filters with high orders are designed usually with 2 or more cascaded sections. This order 4 filter need only one OA IC , so we can achieve lower distorsions, lower intermodulation … Resistors values...

AC Motor Speed Controller

This AC motor speed controller can handle most universal type (brushed) AC motors and other loads up to about 250W. It works in much the same was a light dimmer circuit; by chopping part of the AC waveform...

Quiz Circuit

author: Andy Collinson e-mail: anc@mitedu.freeserve.co.uk web site: http://www.zen22142.zen.co.uk I've had a few requests for a quiz circuit, so here is a 4 input design which can easily be modified....

A Noise Meter Circuit::: save ears

Hello… HELLO! Are you deaf? Do you have disco ears?’ If people ask you this and you’re still well below 80 , you may be suffering from hearing loss, which can come from (prolonged) listening to very...

TV Relative Signal Strength Meter

This circuit was designed to assist the installation of TV antennas. The signal is monitored using a small portable TV set and this circuit monitors the output of the TV's FM detector IC via a shielded...

Everything-that-moves ALARM Project

A crucial failing of proximity detectors is their unreliable and tricky nature. This is where they are used to detect humans, not to speak of smaller living beings. One common approach is to detect...

Air Flow Detector Project

This simple circuit uses an incandescent lamp to detect airflow. With the filament exposed to air, a constant current source is used to slightly heat the filament. As it is heated, the resistance...

Sound Operated Switch Project

Circuit diagram  Notes: This sensitive sound operated switch can be used with a dynamic microphone insert as above, or be used with an electret (ECM) microphone. If an ECM is used then R1 (shown...

Wart Zapper Project

A Recent History By now, the Wart Zapper has quite a history behind it. Three different embodiments have been published in three major magazines. It has gone into production in South Africa, and (without...