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LED RF Signal Meter – Circuit Schematic
LED RF Signal Meter
This is a high quality RF signal meter based around the Analog Devices AD8313 0. 1 GHz - 2. 5 GHz logarithmic detector IC. It is capable of detecting signals as...
FM Wireless Microphone Transmitter with High Power – Circuit Schematic
FM Wireless Microphone Transmitter with High Power
FM Wireless Microphone has been a very popular project with beginners and experienced constructors alike. It has been used inside guitars and as the basis of a ...
FM Audio Transmitter Circuit – Circuit Schematic
FM Audio Transmitter Circuit
It is illegal in most countries to operate radio transmitters without a license so take care with transmitter circuits. This FM low power circuit may be tuned t...
Simple FM Transmitter – Circuit Schematic
Simple FM Transmitter
Frequency range is 100-108 MHz. The circuit is only mono circuit, and accepts an audio input from either a microphone or other source. The input impedance is 1M...
1.5 Watt FM Transmitter circuit – Circuit Schematic
1.5 Watt FM Transmitter circuit
I MAID THIS PROJECT SUCCESSFULLY. WITH PROPER FREQUENCY AND STRENGTH. IF YOU WANT HELP THEN CONTACT ME i will surly help you to bring out you from the problem ...
Schematic Diagram DCF77 Preamplifier circuit and explanation – Circuit Schematic
Schematic Diagram DCF77 Preamplifier circuit and explanation
A popular project among microcontroller aficionados is to build a radio-controlled clock. Tiny receiver boards are available, with a pre-adjusted ferrite antenn...
FM Wireless HI-FI circuit – Circuit Schematic
FM Wireless HI-FI circuit
Circuit To relieve you of any concern related to high frequency, I used a module ready, in case a module Aurel audio FM transmitter. This tiny circuit board wit...
MOSFET-BASED PREAMPLIFIER FOR FM RADIO Project PCB – Circuit Schematic
MOSFET-BASED PREAMPLIFIER FOR FM RADIO Project PCB
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 station...
Bad Case of the DTs PCB – Circuit Schematic
Bad Case of the DTs PCB
Circuit Fear not, dear reader - I haven`t given up the sauce. I am not in withdrawal, suffering severe autonomic instability. I refer not to Delirium Tremens, b...
Active FM Antenna Booster circuit PCB – Circuit Schematic
Active FM Antenna Booster circuit PCB
It is tapped at the first turn from ground lead side. Coil L2 is similar to L1, but has only three turns. Pin configuration of transistor 2SC2570 is shown in th...
Active FM Antenna Booster circuit – Circuit Schematic
Active FM Antenna Booster circuit
Input coil L1 consists of four turns of 20SWG enamelled copper wire (slightly space wound) over 5mm diameter former. It is tapped at the first turn from ground ...
Economical Transistor Radio – Circuit Schematic
Economical Transistor Radio
The schematic diagram shows an audio stage with a common-collector circuit. This does not damp the tuned circuit, but instead actually increases its response. T...
Schematics VHF FM Receiver TDA7000 88-108 MHz – Circuit Schematic
Schematics VHF FM Receiver TDA7000 88-108 MHz
The 10K resistor (*) is only required if you want the receiver to mute (squelch) under no-signal conditions. You could add a 100K in series with this resistor t...
144mhz 2m converter – Circuit Schematic
144mhz 2m converter
The reception of 2 metre signals is generally with a converter and short wave receiver, preferably of communications type. The latter will have sensitivity and ...
Simple RF Detector For 2M – Circuit Schematic
Simple RF Detector For 2M
This simple circuit helps you sniff out RF radiation leaking from your transmitter, improper joints, a broken cable or equipment with poor RF shielding. The tes...
Frequency Doubler – Circuit Schematic
Frequency Doubler
If you are working at frequencies of the order of 850MHz to 4GHz andnd that a frequency multiplier is required, the HMC 187, HMC 188 and HMC 189 (see table) f...
Diode Radio For Low Impedance Headphones – Circuit Schematic
Diode Radio For Low Impedance Headphones
If you ever look at construction notes for building old detector type radios the type of headphones specified always have an impedance of 2 G— 2000. Nowadays ...
1.2GHz VCO With Linear Modulation circuit using MAX2754 – Circuit Schematic
1.2GHz VCO With Linear Modulation circuit using MAX2754
Since high frequency voltage-controlled oscillators, or VCOs, are not easy to construct, Maxim ( has produced an integrated 1. 2GHz oscillator, the MAX2754. The...
10 to 1000 MHz Oscillator circuit with RF2506 – Circuit Schematic
10 to 1000 MHz Oscillator circuit with RF2506
Nowadays, it is no longer necessary to use discrete components to build oscillators. Instead, many manufacturers provide ready-made voltage-controlled oscillato...
0-44dB RF Attenuator circuit with RF 2420 – Circuit Schematic
0-44dB RF Attenuator circuit with RF 2420
Anyone who has to reduce the amplitudes of RF signals in a controlled manner needs an attenuator. Linearly adjustable attenuation networks using special PIN dio...