RF Receiver Circuits
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My mobile rig, a Kenwood TM-D710E, needed a GPS receiver for APRS use. The GPS-710 wasn`t readily available and, besides, is quite expensive. I therefore decided to build my own. I found a Royaltek RGM-3600 GPS receiver on eBay for less than £20. This is a.... -
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.... -
Various architectures of receivers has been proposed in literature, but most popular architectures among them like Heterodyne, Homodyne, Wideband-IF and Low-IF are presented here. Heterodyne Arch.... -
A new high-performance regenerative receiver is available as a kit. Using a new regenerative detector circuit allows a good performance regarding sensitivity.... -
This is the complete circuit of the modern homodyne receiver. This receiver can receive AM CW and SSB transmissions... -
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.... -
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,.... -
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.... -
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.... -
tuned-radio-frequency receiver. A radio receiver consisting of a number of amplifier stages that.... -
This page covers several different regenerative receiver circuits that were used in the past, mostly from 1920s to 1940s. Connections are shown with electron tubes (vacuum tubes/valves), but FET transistors can be substituted with little or no changes. To.... -
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 Passive Aircraft Receiver is basically an amplified "crystal radio" designed to receive nearby AM aircraft transmissions. The "passive" design uses no oscillators or other RF circuitry capable of interfering with aircraft communications so it should be.... -
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 to get an adjustable squelch. This circuit will JUST drive a crystal earphone or high impedance.... -
There are currently several nice ICs available that contain a nearly complete receiver. This project is a complete FM receiver circuit with excellent receive and sound qualities. The only disadvantage of using this IC TDA7021T from ST-NXP Wireless, from the.... -
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.... -
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.... -
Function: step down the antenna impedance from ‘high to to 50? and not, as would be expected, to effect a change from balanced to unbalanced. Component: .... -
The circuit diagram of the single chip AM radio. The circuit is designed around the IC ZN414Z which is a ten transistor tuned radio frequency .... -
The following circuit shows about Noisy Regen Receiver Circuit Diagram. Features: Noisy Regenerative Receiver Circuit, making it easier to .... -
The following circuit shows about 550 to 1100 KHz AM Receiver Circuit. Features: used to adjust the sensitivity and selectivity of the circuit, .... -
Description:The following circuit shows about GPS Receiver RF Block Diagram. This circuit based on the MAX2742 IC. Features: a complete GPS receiver, GPS .... -
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....
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
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.... -
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.... -
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.... -
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.... -
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,.... -
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.... -
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.... -
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.....
Popular Circuits
This 6V to 12V converter circuit is made with an IC from SGS with several additional components....
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The input signal is amplified by the transistors. The distorted output is then clipped by the two...
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Ralph Stirling, KC3F, and I built the first generation using a Texas Instruments C5X DSK digital...
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Figure 1 shows the schematic for a universal input, 7. 6 V, 700 mA CV/CC power supply for LED...
This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in...
In battery-powered applications, like cell phones, PDAs, digital cameras, etc. , an integrated...
The schematic diagram of the MS Decoder may look complicated but is actually quite simple. Both...
Adapting one of my failed Tesla coils into a crystal radio set to show the neighborhood kids....
As shown by the bistable circuit and optocoupler transistor of FIG. In the initial state the...
Circuit shown in Figure, LD168 is a flash of tape recorders speaker for sound level indication...