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RF Receiver Circuits
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All Transmitter & Receiver schematics
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The AA8V Twinplex Regenerative Receiver
The antenna coupling capacitor is a critical component in a regenerative receiver without an RF stage, like the Twinplex. In such a receiver, the antenna is an integral part of the regenerative detector, and for proper operation the coupling to the antenna must be easily adjustable. Increasing the capacitance increases the coupling and vise versa.
FM radio receiver
Covering FM radio reception frequency, by adjusting the L value (La stretch or compression coil L) can easily change the transmission frequency to avoid the FM radio. Transmit signal coupled to the antenna through C4 to launch out.
make this one transistor radio receiver
This is probably the simplest radio that one could ever imagine of making. The circuit is so simple that it could be finished assembling within a few minutes and you are already listening your favorite programs over it. The circuit of a single transistor radio shown here though looks pretty ordinary, incorporates all the above stages and thus
alternative power source for magellan gps receivers
am bcb radio receiver 2
gps receiver support kit
arduino based thermorbios weather station receiver
Have finished documenting/cleaning the code for my Jaycar el-cheapo Thermor/BIOS branded wireless weather station receiver. The basis for the code comes from the Practical Arduino weather station receiver project. In the end all it took was a week of analysing the RF signal from the weather station using my soundcard and wasting countless...
A very simple direct conversion receiver based on the NE602 Gilbert Cell mixer and a LM386 audio amplifier. The circuit is based onthe famoussudden receiver design from the Rev George Dobbs G3RJV many years ago and looks something like this: My implementation removes all the tuned circuit stuff from pins 6 and 7 of the NE612 (NE602 in my...
radio receiver using the zn414
low power receiver serves multiple wireless standards
By combining a current-reuse amplifier and switch based mixer, a dual-band receiver front end offers excellent performance with extremely low power consumption..
Motorola DSP Receiver
Ralph Stirling, KC3F, and I built the first generation using a Texas Instruments C5X DSK digital signal processing starter kit. Let it suffice to say that the second generation is a tremendous improvement over the first, because it uses a much more suitable DSP evaluation board from Motorola, the DSP56002EVM. You may wonder what the big deal is....
introducing super het receivers
progressive crystal set to regenerative receiver
single conversion 10.7mhz pulse counting receiver
solid state short wave and vhf receiver
am receiver based on tda1572 ic
ssb add on for am receivers
Given favourable radio wave propagation, the shortwave and radio amateur band are chock-a-block with SSB (single-sideband) transmissions, which no matter what language they`re in, will fail to produce intelligible speech on an AM radio. SSB is transmitted without a carrier wave. To demodulate an SSB signal (i. e. turn it into intelligible speech) i
Ultrasound Sonic Heterodyne Receiver
High Performance Regen Receiver
A new high-performance regenerative receiver is available as a kit. Using a new regenerative detector circuit allows a good performance regarding sensitivity..
Amazing all band receiver circuit
ZN414 portable am receiver
gps galileo dual rf front end receiver
Considering the technical requirements defined in the previous topic as the starting point, this topic will explain in detail the design of every block of the radio frequency (RF) front-end. To accomplish a design that fulfils specifications, the design is ..
Diode Radio for Low Impedance Headphones
The most commonly available headphones have an impedance of 2 × 32 ?, this relatively low value makes them unsuitable for such a design. However, with a bit of crafty transformation these headphones can be used in just such a design. To adapt them, you will need a transformer taken from a mains adapter unit, the type that has a...
air craft receiver
The communications between commercial aircraft and the ground can be interesting, amusing and sometimes even disturbing. However radios that receive the approximately 220MHz to 400MHz band commonly used for aircraft (both military and commercial) are not easily found. And scanners can be complicated, large and expensive. With an easy to build circ
circuit satellite receiver
The Dish Network 322 Satellite Receiver accommodates television viewing of two different programs in two different locations. This is a schematic block diagram of an exemplary circuit logic diagram. The receiver can predict the elevation angle of each Schematic Block Diagram circuit Satellite Receiver
wireless receiver with gl116 decoder
tuned radio frequency receiver
tuned-radio-frequency receiver. A radio receiver consisting of a number of amplifier stages that..
am radio receiver with mk484
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, it has only three leads and comes in TO92 package and require only few external parts because all the necessary circuitry like RF amplifier, AGC and detector are incorporated inside the IC. T
MK484 AM receiver circuit
A very cheap and simple AM receiver circuit using IC MK484. The circuit requires fewexternal components and has a frequency range from 150KHz to 3MHz..
AM receiver using ZN414
This is the circuit diagram of the simplest single chip AM radio. The circuit is designed around the IC ZN414Z which is a ten transistor tuned radio frequency receiver. The IC has only three leads and is available in the TO92 package. All necessary circuits required for an AM receiver (RF amplifier, detector and AGC are incorporated inside the IC)
Diodes for crystal receivers
Diodes with a low voltage drop, also have a high reverse current (leaking current), this will load the detector circuit heavier, the Q of the detector circuit reduces, and with that also the voltage across the LC circuit. At a lower input voltage the diode will give much more losses, and it can happen that despite the lower voltage drop of the
FM Radio Circuits
RF Transmitter Circuits
RF Amplifier Circuits
AM Radio Circuits
FM Transmitter Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial