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4 Band Resistor
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This simple AM circuit uses a 561B. There's no inductance/capacitance tuning circuit. The 365 pF capacitor connected between pins 2 and 3 does all the tuning. The circuit needs a good outside antenna and a solid ground. And if you want to further improve operation, stick a broadband amplifier in front of the receiver.
voltage frequency synthesizer PLL
The ÂµA2240 consists of four basic circuit elements: (1) a time-base oscillator, (2) an eight-bit counter, (3) a control flip-flop, and (4) a voltage regulator. The basic frequency of the time-base oscillator (TBO) is set by the external time constant determined by the values of R1 and Cl (1R1C1 = 2 kHz). The open-collector output of the TBO is...
PLL FM demodulator LM565CN RC4558DN schematic
Circuit is shown using 10kHz 3kHz LM565CN constitute the FM demodulation circuit. The V1 and V2 differential demodulation output diagram (b) of the differential amplifier A1 level displacement and amplification, and then by the A2 active LPF filtered pulsating component of 20kHz.
Full-band phase locked loop circuit diagram fast
A circuit diagram of a phase locked loop fast the whole band takes a Am686 latched comparator as voltage controlled oscillator, and the other with a TTL latch coupled to genera
Using PLL Phase Locked Loop IC frequency N 1 to 10 of the multiplier circuit
C- MOSIC4046 PLL having the main function of a maximum operating frequency of iMHz integrated circuit, which is connected to the programmable divider, can constitute the input
PLL FM demodulator 4046
Circuit is shown using the 4046 PLL FM demodulation circuit device comprising, IF FM demodulation circuit output by the input signal frequency signal.
RF transmitter uses AMI encoding
The circuit in Figure 2 shows a 16-channel, AMI-encoded RF transmitter for data rates as high as 28.8 kbps. The circuit operates in the unlicensed (FCC Part 15) 902- to 928-MHz industrial, scientific, and medical (ISM) band and is reliable for open-field distances as long as 1000 ft. You can easily modify it to sustain higher or lower data...
Ballast Control IC Design
The IRPLLNR2 is a high efficiency, high power factor, fixed output electronic ballast designed for driving rapid start fluorescent lamp types. The design contains an EMI filter, active power factor correction and a ballast control circuit using the IR21571. This demo board is intended to ease the evaluation of the IR21571 Ballast Control IC,...
Two gates and a microprocessor form digital PLL
You can use Microchip`s low-cost PIC16F818 microprocessor and a pair of gates to construct a digital PLL that can clean noisy digital signals over a range of 4 to 40 kHz. Featuring programmable lock range, phase differential, and loop gain, the digital-PLL engine and lock detector can extract clock and data information from noisy, short-range...
Circuit allows high-speed clock multiplication
In theory, synchronous clock multiplication is an easy task. A simple PLL with two digital dividersone inserted just after the VCO (voltage-controlled oscillator) and the second one placed directly at the input of the phase detectormay do the job. The flexibility of such a configuration allows for clock multiplication by any rational number.
Clock multiplier circumvents PLL
Using a standard PLL circuit, such as the CMOS 4046B with some passive components, is a well-known way to design a clock multiplier. Unfortunately, using a PLL in a digital circuit has two disadvantages: It takes a long time for the circuit to reach a stable output frequency, and the frequency-drift compensation has a complex design.
Clock-recovery scheme suits low-SNR systems
A clock-recovery architecture can operate with NRZ digital signals, even at low SNRs. A clock-recovery subsystem is based on a PLL comprising a phase comparator, a loop filter, and a voltage-controlled oscillator (VCO).
VID2G project is an PAL/NTSC color generator & video identifier with digital sync regeneration, digital PLL, video Squelch output, predefined video pages, keyboard & full RS-232 access, etc. Dynamic and fixed ID`s, user positions, user selectable start page, Text script files for user created pictures (samples included in ZIP), and more.
Low-Cost PCO Billing Meter
In the circuit shown in Fig. 1, when the handset is off-hook, the optocoupler MCT2E (IC1) conducts and forward biases transistor T1, which, in turn, forward biases transistor T2 and energises relay RL1. In energised condition of relay, the upper set of relay contacts connects the positive supply rail to PLL (phase-locked loop) IC2 (LM567) pin 4,...
The IRPLLNR1 is a high efficiency, high power factor, non-dimmable electronic ballast designed for linear fluorescent lamp types. The design contains an active power factor correction circuit for universal voltage input and a ballast control circuit using the IR2153 for controlling the lamp. Other features include EMI filtering, transient...
Video Operated Relay
Many Video Operated Relay (VOR) circuits have been published in recent years for use in connection with ATV repeater controllers or automatic videotape logging systems. Unfortunately, many of these circuits fail to properly detect certain video signals depending on their signal-to-noise ratio or their picture content. Most designs rely on using...
200mW FM transmitter
Here is the latest and greatly improved TX200 VFO/VCO FM transmitter. The most versatile transmitter to date that can be turned into high fidelity stereo PLL based 200mW FM transmitter. It is a perfect circuit for transmitting your music around the house and yard. TX200 uses only two coils; one in the oscillator and the other one in the 200mW...
5W PLL FM Transmitter (PIC16F627A)
The transmitter includes RDS/SCA input and Audio/MPX input with optional preemphasis. It can be used with or without stereo encoder. Tuning over the FM band is provided by two buttons that control dual-speed PLL. The transmitter can work also without the LCD display. Some experience with building devices of this kind are highly recommended....
Stereo PLL FM transmitter
This is the latest BH1417 FM Transmitter design from RHOM that includes a lot of features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, stereo encoder for stereo transmission, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference, PLL...
5W Chinese PLL FM Transmitter With LCD Printed Circuit Board (PCB)
Here's PLL FM transmitter circuit from china. This circuit uses the familiar 2SC1971 for final power amplifier stage. The PLL controller of the FM transmitter use SAA1057 and PIC16F628 (download HEX file).
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 choice of an unspecified frequency on the band used, either the 41, or the 72 MHz. The step between channels is 5 kHz, giving us 101 frequencies in 72 MHz and 41 in 41 MHz. In practice,...
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 excellent RF circuit covers all the FM Band in a voltage range of 4V to 8V. The Kvco factor is very stable all over the FM band, consequently, we have applied the AF signal directly on the...
Pll Fm Radio Transmitter Circuit Schematic
4046 PLL bassed A roulette wheel electronic circuit with explanation
A roulette wheel electronic circuit can be designed using a 4046 PLL containing a voltage controlled oscillator or VCO, two phase comparators, a source follower, and a Zener diode that is used to produce a low-frequency, pulsed output of about 40 Hz. The VCO`s frequency range of this roulette wheel electronic circuit is determined by R6 and C2, wh
1W PLL FM transmitter schematic
Cool little FM transmitter. Suitable for study purposes, you can use the RF part of this transmitter easily for your projects. However, unless you know how to build a serial data link and connect this LPFM transmitter to a PC or a microcontroller, you won`t be able to use the PLL. All info about the PLL is available at Plessey`s web page.
XR2212 PLL FM demodulator Circuit
A simple PLL FM demodulator circuit using IC XR2212 is shown here. XR2212 is a highly stable, monolithic PLL (phase locked loop) IC specifically designed for communication and control system applications. The IC has 0. 01 Hz to 300KHz frequency range, 4. 5 to 20V operating voltage range, 2mV to 3Vrms dynamic range, high temperature range, TTL /...
Stereo PLL FM Transmitter With BH1417
This is the latest BH1417 FM Transmitter architecture from RHOM that includes a lot of appearance in one baby package. It comes with pre-emphasis, limiter so that the music can be transmitted at the aforementioned audio level, stereo encoder for stereo transmission, low canyon clarify that blocks any audio signals aloft 15KHz to anticipate any RF
PLL Hum Cancellation Circuit
This report describes the operation and adjustment of a Phase Locked Loop hum cancellation circuit that can be used to reduce the residual hum from any amplifier. Normally this is useful for DHT amplifiers with AC operated filaments, as even with a hum balancing potentiometer, there is a residual hum component at twice the line frequency that is u
PLL FREQUENCY MULTIPLIER MODULE
50mW BH1417 Stereo PLL FM Transmitter
This is an excellent Hi-Fi Stereo PLL FM Transmitter, the audio source can be the computer, sound card, game consoles, CD, DVD, MP3, stereo mixer for stereo audio signal modulated emission transmission, the board also contains two mic amplifier, with the common receiver can achieve high-fidelity FM stereo radio FM stereo transmission. Suitable for
accelerometer Can internal PLL affect control logic in MEMS sensor
Achieve communication between MCU and accelerometer trough I2C nor SPI. I observed that shorting PLL filter input in device causes no effect on both gyro readings and operation. My assumption is that PLL is present only in accelerometer part of the device. I have no data regarding PLL operation, the filter is built upon datasheet and board for...
FM Radio Circuits
RF Transmitter Circuits
RF Receiver 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