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Radio circuit diagrams

Am, fm transmitters, receivers, RF amplifiers, detectors, VHF, wireless microphones, spy bugs...

AM FM Simultaneous Transmitter Using Digital IC


AM FM Simultaneous Transmitter Using Digital IC
[View AM FM Simultaneous Transmitter Using Digital IC circuit diagram]


Medium range transmitter


This is a medium range transmitter circuit diagram. This is also improved by changing the values of the resistor.
[View Medium range transmitter circuit diagram]


A small FM transmitter


This SMD FM transmitter has an operating frequency of about 80 to 115MHz. Under reasonable circumstances you will be able to receive its signal at a distance of about 200 meters.
[View A small FM transmitter circuit diagram]


4W FM Transmitter


Very strong FM transmitter. You maybe need license to run this.
[View 4W FM Transmitter circuit diagram]


FM radio


Frequency of reception: 88~108MHz
[View FM radio circuit diagram]


Transmitter FM 45W with valve


Force of expense: max 45W
[View Transmitter FM 45W with valve circuit diagram]


CB transmitter


Frequency of emission at AM: ~27MHz
[View CB transmitter circuit diagram]


CB receiver


CB receiver
[View CB receiver circuit diagram]


3W FM Transmitter


This is the schematic for an FM transmitter with 3 to 3.5 W output power that can be used between 90 and 110 MHz. Although the stability isn't so bad, a PLL can be used on this circuit.
[View 3W FM Transmitter circuit diagram]


Linear FM 50Watt with BLY90


A amplifier of force RF for the FM, is always essential for the amateur that wants it strengthens some small transmitter, that likely already it has manufactured or has been supplied ready.
[View Linear FM 50Watt with BLY90 circuit diagram]


AM Transmitter


The circuit is in two halfs, an audio amplifier and an RF oscillator.
[View AM Transmitter circuit diagram]


Small Radio Transmitter


The circuit is (of course) only mono, and accepts an audio input from either a microphone or other source. The input impedance is 1Mohm. The input sensitivity is 5mV and the max input signal is 10mV. The transmitted signal can be picked up on a FM radio. The circuit can be used for short-range transmission, eg. for wireless microphones.
[View Small Radio Transmitter circuit diagram]


FM Transmitter Bug


This small transmitter uses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base emitter capacitance of the transistor acts as a short circuit, so in effect, it still is.
[View FM Transmitter Bug circuit diagram]


73 MHz Hallogene Lamp Radio-Controlled


This circuit is a 73 MHz Hallogene Lamp Radio-Controlled. The purpose of it is to control the power state of a hallogene lamp by a remote control.
[View 73 MHz Hallogene Lamp Radio-Controlled circuit diagram]


6 x 6 Loop Antenna


It uses one, six foot square, six turn loop, and is aperiodic in nature, covering the frequency range 50KHz - 5000KHz
[View 6 x 6 Loop Antenna circuit diagram]


Surveillance Transmitter Detector


This circuit can be used to "sweep" an area or room and will indicate if a surveillance device is operative
[View Surveillance Transmitter Detector circuit diagram]


The ATL-3 Loop Antenna


The ATL-3 Loop Antenna. The Medium Wave Circle can be found on http://www.mwc.org
[View The ATL-3 Loop Antenna circuit diagram]


UHF Preamplifier


This circuit is designed to work at UHF frequencies in the range 450-800MHz. It has a gain of around 10dB and is suitable for boosting weak TV signals.
[View UHF Preamplifier circuit diagram]


SW Receiver Using MK414


A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the tropical bands and 49 metre bands
[View SW Receiver Using MK414 circuit diagram]


ZN414 Portable Receiver


An AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout.
[View ZN414 Portable Receiver circuit diagram]


4 Band Double Tuned Preselector


The input can be from a longwire or a loop antenna. The unit covers MW and Sw to 30MHz.
[View 4 Band Double Tuned Preselector circuit diagram]


2 Transistor Transmitter


A compact 2 transistor transmitter for use at VHF frequencies
[View 2 Transistor Transmitter circuit diagram]


4 Transistor Transmitter


This circuit provides an FM modulated signal with an output power of around 500mW
[View 4 Transistor Transmitter circuit diagram]


Simple Field Strength Meter


This Field Strength Meter is simple and also quite sensitive. It uses an ordinary digital voltmeter to measure RF signal strength up to a few hundred MHz
[View Simple Field Strength Meter circuit diagram]


Field Strength Meter


This is a wide band signal strength meter circuit which responds to small changes in RF energy, designed to be used for the VHF spectrum and will respond to AM or FM modulation or just a plain carrier wave
[View Field Strength Meter circuit diagram]


A bipolar regenerative receiver


Contrary to what some radio experimenters think, a bipolar regenerative design can be made to work efficiently
[View A bipolar regenerative receiver circuit diagram]


AM Receiver


This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC which is now replaced by the MK484.
[View AM Receiver circuit diagram]


FM Transmitter from David Sayles


A small FM voice transmitter for Band 2 VHF
[View FM Transmitter from David Sayles circuit diagram]


2 Transistor FM Voice Transmitter


This circuit may be tuned to operate over the range 87-108MHz with a range of 20 or 30 metres.
[View 2 Transistor FM Voice Transmitter circuit diagram]


Medium Wave Active Antenna


This circuit is designed to amplify the input from a telescopic whip antenna
[View Medium Wave Active Antenna circuit diagram]


TV Transmitter


A VHF band TV transmitter using negative sound modulation and PAL video modulation. This is suitable for countries using TV systems B and G.
[View TV Transmitter circuit diagram]


FM Transmitter from David Sayles


This small FM transmitter circuit by David Sayles
[View FM Transmitter from David Sayles circuit diagram]


FM OpAMP Transmitter Circuit


FM transmitter with OpAmp circuits
[View FM OpAMP Transmitter Circuit circuit diagram]


Op Amp Radio


Simple radio with operational amplifier circuit diagram.
[View Op Amp Radio circuit diagram]


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