Radio & RF Circuits - Page 2

FM, AM/MW and SW Antenna Amplifier

Here is a schematic of FM, AM/MW and SW antenna amplifier circuit or we can also say it antenna preamplifier circuit which can be used to increase the faint signals of...

Field Strength Meter (FSM)

Field strenght meter circuit is a very useful device for measuring the RF output of any transmitter or experimenting different antennas with the transmitter...

AM Radio Receiver with MK484 IC

Here is a schematic of a good quality AM radio receiver circuit. The heart of the circuit is MK484 AM radio IC. It is a high sensitivity and high quality IC...

AM-FM-SW Active Amplifier

A small and easy to build circuit which will boost the signals of AM FM and SW receptions.

1 Watt FM RF Amplifier

A useful circuit to increase the range of small fm transmitters. Minimum inupt of the circuit is 100mW, fit the circut in metal case and apply 12 volt to the circuit.

3V Two Transistor FM Transmitter Circuit

The circuit page is in pdf file format. This circuit runs from 3 to 5 volt and provide a range of 300 meters.

SSB Signal Amplifier

The circuit increases the reception of CW and SSB band. This circuit has a hartely oscillator frequency range across the broadcast band.

AM Signal Catcher

This is a very simple and easy to build circuit of AM modulation monitoring for HAM transmitters. You don't have to make any connection with the transmitter only you have to do is that place the coil L1 near the final tank of antenna matching inductor

Portable AM Receiver Using ZN414 or MK484 IC

Many electronics hobbyists and students like to make AM radio receiver by their own. Building an AM radio is a interesting topic in the field of electronics.

Solar Powered AM Radio Receiver

Here is a project of a solar powered AM radio receiver circuit. The circuit is built around a MK484 AM radio IC...

Make an AM Radio Receiver with Three Transistors

The circuit shown here is an AM radio receiver with three transistors. The circuit is using three BC548 transistors and few other parts...

FM Radio Receiver Using TDA7000

TDA7000 is a famous FM radio receiver IC also called one chip FM radio receiver covers VHF FM band from 70 to 120 MHZ. This IC was first introduced in...

TDA7010T FM Radio Receiver

The circuit is very simple to make and require only few external components and can be fit in a very small place. L1 is equal to 6 turns of...

RF Detector

Like field strength meter an RF detector circuit is also a useful project to detect a nearby RF signal. The circuit shown here can be used to detect wide band of RF...

RF Detector (Improved)

Here is an improved version of the RF detector circuit that we have discussed previously.  The sensitivity of the circuit is almost double as compare to the old circuit...

Cell Phone Signal Activated LED

A very simple and interesting project / schematic of a cell phone signal activated LED circuit. The circuit will light up an led when you call from your cell phone.

ZN415 AM Radio with TDA2822M Amplifier

The figure below shows a schematic of ZN415 AM Radio with TDA2822M amplifier IC. ZN415 or ZN415E is an AM radio IC manufactured in 8 pin DIL package...

Field Strength Meter

Here is a sensitive wide band RF field strength meter circuit. It can also be used as a wide band RF detector. The circuit is using four LEDs to indicate the signal strength...

Cell Phone Detector

Here is a very interesting and useful project of a sensitive cell phone detector circuit or we can also say it cell phone finder, sniffer or calling detector...

Long Range Cell Phone Detector

Here is a very sensitive long distance cell phone detector circuit that can detect the mobile phone signals from 30 to 40 feet away...

RF Remote Control Relay Switch

This is a project of an RF remote control relay switch circuit. The circuit is using a relay at the output from which you can connect your home appliances...

Sensitive FM Field Strength Meter Or RF Detector

Here are the projects of very sensitive FM field strength meters or we can also say them RF detectors. Both the circuits can be used to measure the field or signal...

Mobile Phone Detector

This is a project of a very sensitive mobile phone detector circuit using a CA3140 opamp IC, a 555 timer IC and few other discrete components...

Cell Phone Call & SMS Alerter

The figure shows a project of cell phone call & SMS alerter circuit. Some times we cannot hear the ring tone or SMS tone of our cell phone when they are in other room...

Long Range Cell Phone Detector Using LM358

Here is a project of a very sensitive long range cell phone detector circuit using a LM358 IC. The circuit can detect a cell phone from 10 to 12 meters away...

Wireless RF Remote Control ON/OFF Switch

The circuit shown here is very easy to build and using very low cost and commonly available components. The circuit has also a good range of upto 20 meters...

Wireless RF Remote Control Doorbell

This is a circuit of a wireless RF remote control doorbell using low cost and commonly available components. The working range is upto 20 meters...

Cell Phone Activated Wireless Remote Control Doorbell

The article describes a cell phone activated wireless remote control doorbell circuit, working range is 10 to 12 meters...

Easy Cell Phone Detector Using LM324 IC

The article describes a cell phone activated wireless remote control doorbell circuit, working range is 10 to 12 meters...

Wireless Water Pump Motor Controller

The figure below shows a wireless water pump controller circuit that controls 220V water pump motor wirelessly. The circuit is a completely automated therefore...

Wireless Four Level Temperature Sensor

An effective wireless temperature sensor can also be built with few low cost ICs and components as shown in the figures...


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