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PLL 1 Watt FM transmitter – Circuit Schematic
PLL 1 Watt FM transmitter
This small FM transmitter includes a limiter, a microphone amplifier and a PLL digital tuning. All the parts are placed on one circuit board. The RF power is sw...
0,4 Watt FM transmitter – Circuit Schematic
0,4 Watt FM transmitter
Power supply: 12-14 V stab., 100 mA. RF power: 400 mW. Impedance: 50-75 ohm. Frequency range: 87,5-108 MHz. Modulation: wideband FM. Connect the 6 V / 0,1 A bul...
AM To FM converter – Circuit Schematic
AM To FM converter
This circuit can be used to recieve AM stations in an FM radio. Is a regenerative circuit that samples AM signals of all frequency and retransmits them in the F...
CW Transmitter – Circuit Schematic
CW Transmitter
This one-valve (ECL82) CW Transmitter occupies a very special place in my amateur radio history. I was first licensed in 1994 but did not operate on air. I comm...
PC FM radio – Circuit Schematic
PC FM radio
Stabilised tendency of catering: Vcc=9~12V. Frequency of reception: 88~108MHz. Consumption: 100mA. If you know some language of programming as C ++, PASCAL, VI...
FM transmitter 2N2222 – Circuit Schematic
FM transmitter 2N2222
This circuit is a simple two transistor (2N2222) FM transmitter. No license is required for this transmitter according to FCC regulations regarding wireless mic...
1.57-GHz Front-End for GPS Receiver – Circuit Schematic
1.57-GHz Front-End for GPS Receiver
The GPS is based on 24 satellites located in six orbital planes at a height of 20 200 km and circle the Earth every 12 h. Each plane is inclined at 55 to the Ea...
RF Recieving Amplifier for 40MHZ – Circuit Schematic
RF Recieving Amplifier for 40MHZ
The sensitivity of receiver it is possible to increase itself considerably, if is interfered, between this and his aerial, a amplifier RF. The amplifier of cir...
Two channel frequency synthesizer – Circuit Schematic
Two channel frequency synthesizer
This instrument is a one or two channel frequency synthesizer. DC to 35 MHz frequency with 0.1 Hz resolution. +16 to -48 dBm signal level with 0.1 dB resolutio...
FM Transmitter with PLL – Circuit Schematic
FM Transmitter with PLL
In order to simplify the transmitter design, we've used the new pll circuit from Motorola :the MC145170. This PLL includes the prescaler and a serial standard b...
FM PLL transmitter – Circuit Schematic
FM PLL transmitter
This new FM transmitter is very easy to make and doesn't need any RF tuning. First of all ,we have used an integrated VCO: The POS150 from Mini-circuits. This e...
Microphone FM bug transmitter – Circuit Schematic
Microphone FM bug transmitter
This is the basic fm trasmitter that I built. In theory, according to electronics, it shouldn't work but works fine and is very sensitive. It can transmit the s...
41-72MHz micro-receiver ( MC3362 ) – Circuit Schematic
41-72MHz micro-receiver ( MC3362 )
This receiver weighs about 6 g, used in 41 and 72 MHz, met a great success with readers of the magazine. The RX22 is the subject of these lines is improved RX20...
ALL band reciever using MC3362 – Circuit Schematic
ALL band reciever using MC3362
This receptor is born of our annoyance against the irritating problem of Quartz: With the RX21, completed research of cut crystal for your personal rating, you ...
PLL 41MHz reciever with 68HC711D3 – Circuit Schematic
PLL 41MHz reciever with 68HC711D3
The quartz QZ1 of the preceding receivers which set the work frequency is not on the market any more. It is replaced by a locking phase loop allowing the free ...
HF reciever with MC3362 – Circuit Schematic
HF reciever with MC3362
The diagram of detail of Fig.2 gives additional precise details: The signal HF collected by the antenna is amplified by T1, framed reel S of agreement L1 and ...
FM Stereo Transmitter with BA1404 – Circuit Schematic
FM Stereo Transmitter with BA1404
You'll find that this is a very easy project to build. It will transmit good quality sound in the FM band ( 88 - 108 mhz ). One inportant item is that the IC ch...
FM Electrocardiogram Monitor with LM331/LM231 – Circuit Schematic
FM Electrocardiogram Monitor with LM331/LM231
V_logic is connected to the power supply Vs and all ground are connected to the negative terminal of the battery. Fout is a square wave of varying frequency wit...
Making a 900MHz Phone Bug – Circuit Schematic
Making a 900MHz Phone Bug
Today they have moved up to 900MHz. It is not easy to build stuff for 900MHz so in this project I will re-use an old cordless 900MHz phone I found in a containe...
Automatic Frequency Control FM reciever – Circuit Schematic
Automatic Frequency Control FM reciever
This is a measurement I did on a FM receiver (MC3372). I have plooted the output DC-bias as function of the IF (Intermediate Frequency) frequency. At 455kHz you...