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FM IF Subsystem with CA3189E
TheCA3189E is a comprehensive FM-IF system designed for high fidelity FM tuners. It includes a three stage FM-IF amplifier/limiter configuration with level detectors for each stage, a double-balanced quadrature FM detector and an audio amplifier that features the optional use of a muting circuit. The advanced circuit design includes desirable...
This circuit shows the TP5700 directly interfacing to a low-voltage DTMF generator. VREGt supplies the necessary 2-V minimum bias to enable the TP5380 to sense key closures and pull its mute output high. VREGt then switches to a 3-V regulated output to sustain the tone dialer during tone generation. The TP5700 DTMF input incorporates the...
The NE592 is connected in conjunction with a MC1496 balanced modulator to form an excellent automatic gain control system. The signal is fed to the signal input of the MC1496 and re-coupled to the NE592. Unbalancing the carrier input of the MC1496 causes the signal to pass through unattenuated. Rectifying and filtering one of the NE592...
Video amplifier and video detector
The circuit has a typical voltage gain of 84 dB and a typical AGC range of 80 dB. It gives very small changes in bandpass shape, usually less than 1 dB tilt for 60 dB compression. There are no shielded sections. The detector uses a single tuned circuit (L3 and CIO)
Personal Message Recorder Circuit
The persona] message recorder is built around an ISD1016 CMOS voicc messaging system, which does away with the cumbersome and expensive analog-to-digital and digital-to-analog conversion circuits. A functional block diagram of the ISD1016 is shown. The ISD1016 contains all of the functions necessary for a complete message-storage system. The...
This circuit functions as a wideband adjustable AGC amplifier. With an effective bandwidth of approximately 10 MHz, it is capable of handling rf input signal frequencies from 3.2 to 10 MHz at levels ranging from 40 mV up to 3 V pk-pk. AGC action is achieved by using optocoupler/ isolater OC1 as part of the gain control"feedback loop.
Automatic gain control is a very useful feature in a number of audio amplifier circuits: tape recorders, telephone speaker phones, communication systems and PA systems. This circuit consists of a HA-5144 quad op amp and a FET transistor used as a voltage-controlled resistor to implement an AGC circuit with squelch control. The squelch...
Agc System For Audio Signals Circuit
This circuit is an AGC system for audio-frequency signals. AGC systems usually consist of three parts: an amplifier, rectifier, and controlled impedance. In this circuit the functions of an amplifier and a rectifier are performed by a single op amp. This makes the system simple and cheap.The rectifier is made with the output push-pull cascade...
The AM Tuned Radio Frequency (TRF) receiver, has a sensitivity of about 1 m V at tbe input for an audio output of "iz W. Capacitor C22 couples audio signals from the power line to the PC board-it must be rated at 600 Vdc. R8 will cause F1 to blow, if C22 shorts. The signal from C22 goes to a tuned network (C1 through C5, Ll, and L2) that has...
Audio AGC amplifier circuit
Audio AGC can keep track, monitor audio preamplifier output signal level when the input signal increases, AGC circuit automatically reduces the gain of the amplifier; when the
IF AGO network circuit diagram
A simple IF AGC signal over a wide dynamic range and excellent linearity characteristics, it may be composed of two chips to obtain:
Delayed type AGC circuit diagram of principle
Commonly referred to as automatic amplitude control circuit AGC circuit. It is mainly used in the receiver, the machine when the input signal amplitude change to maintain the o
TCA440 Datasheet Specification
TCA440 is a AM receiver circuit for LW, MW and SW in battery and line operated radio receivers. It includes an RF prestage with AGC, a balanced mixer, sepa..
LA1061M Antenna Switching Diversity Circuit For FM Tuners
On-Glass Antenna Amplifi er AGC IC LA1070 The LA1070 is an Automatic gain control IC for use with automotive on-glass Antennas By Sanyo Semiconductor Corporation
Yaesu FT-736R AGC
The FT-736R is a V/UHF all mode transceiver. A picture of the FT736R can be seen in figure 1. This article will show how you can modify the AGC (Automatic Gain Control) circuit to disable it. When you are doing radio astronomy it ’s vital to be able to disable the AGC device so that it doesn ’t influence your measurements. The FT736 has a three po
LA1175M FM Mixer IF AGC Driver Buffer For Car Radios Stereo Systems
Simple ADS-B Receiver
The new project uses old analog satellite receiver tuners that have to be modified so that the AFC is disabled and the AGC usually set to maximum gain. The output is the 480MHz IF signal. The IF converter can be for example a Satellite receiver with 70 MHz IF output or a TV receiver / converter tweaked to 1090 MHz input and the IF taken after the
MK484 AM radio circuit design project
This MK484 AM radio circuit provides a complete solution including : RF amplifier, Detection and AGC circuit (automatic gain control ), which requires only a few external components to give a high quality AM Tuner. The circuit has an input impedance of 4Mohms and operates over a frequency range of 150KHz to 3MHz. The IC will run with DC supply bet
Simple CATV Upstream Fiber Optic Receiver Uses DC Pilot AGC. Upstream fiber links in a community antenna television (CATV) system are usually among the most difficult elements of the network to align properly. Set-top boxes and cable modems employ "long-loop" automatic gain control (AGC) (in other w
A Regenerative Receiver with AGC for 80 and 40 Meters
Here`s a dual-band Regen that came from some encouraging emails from Jerry (K9UT) and another gentleman named Harvey, who built my original AGC-80, and its experimental "Regenerodyne" successor, the AGC-80/30. Jerry and I have corresponded on several occasions, and he tells me that he enjoys both receivers and that they work surprisingly well for
Microphone AGC amplifier
A homebrew 2M transceiver I wanted to use it mobile so I wouldn`t have been able to use a fist mike. I had the bright idea of using one of those cheap personal hands free kits you can buy for mobile phones, however once installed reality struck home - hardly any audio! Like the microphone amplifier of many Ex PMR radios and lowcost hand helds,...
MK484 AM receiver circuit A simple AM receiver circuit based on the MK484 AM receiver IC from Rapid Electronics Ltd is shown here. MK4844 is a monolithic integrated circuit that has all the necessary sections of a AM receiver like RF amplifier, detector, AGC etc. The IC is available in TO92 package and requires very few external compo
LA1070 On-Glass Antenna Amplifier AGC IC
LA8161V AGC Amplifier And Pre Amplifier
The LC72146 is a PLL Frequency Synthesizer LSI circuit for electronic tuning in car stereo systems. The LC72146 supports the construction of high-performance, multi- functional electronic tuning systems for the VHF MW, and LW bands. By Sanyo Semiconductor Corporation
L497 HALL EFFECT PICKUP IGNITION CONTROLLER
The LA1061M is an Antenna switching controller for mobile Radio equipment. The LA1061M uses a number of inputs from the receiver circuitry to select the main Antenna or sub-antenna according to signal strength and quality. Weak and strong signals are detected with the S-meter DC voltage and F. E. AGC voltage, respectively. Multi-path distortion is
regenerative radio receivers
A regenerative radio receiver is unsurpassed in comparable simplicity, weak signal reception, inherent noise-limiting and agc action and, freedom from overloading and spurious responses. The regenerative radio receiver or, even super-regenerative radio receiver or, "regen" if you prefer, are basically oscillating detector receivers. They are simpl
Install the red LED at D2. Align the flat side of the LED with the PCB outline. Install a jumper wire at R4 and install a 220uF electrolytic cap at C8 with the negative side to ground. Connect pin2 of J4 to the AGC input on the 612 HF mixer.
A Regenerative Receiver with AGC for 80 Meters or 3-10 MHz Shortwave
Here`s a Regenerative Receiver project that I designed for the 80 meter Amateur band, but which can also be used in a wider-tuning configuration that covers approximately 3 MHz to 10 MHz, for Shortwave (World Band) listeners. Built in the same style as my previous "40-Meter Tweeter" which can also be found at my Radio Projects menu at, this radi
Simple Direct Conversion Receiver
Low-cost CW superhet receiver with a 4. 00 MHz Intermediate frequency. There is no AGC or RF gain control, however this receiver has good large signal handling capability. This receiver uses just 6 bipolar transistors and an op amp for reasonable volume into headphones. Much of the ideas/design of the various stages must be credited to
75 meter qrp ssb transceiver
In general, the transceiver switches the 4-element 1500 ohm xtal BPF ends between the inputs and outputs of the two SA602s to reverse the signal flow for R/T operation. Since no IF amplifier is used in the design, 20 dB of additional receiver gain is produced by the 2N2222 receiver RF amplifier, while automatic gain control (AGC) is produced by...
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)