Agc System For Ca3028 If Amplifier
The circuit operates by utilizing the MPF102, a JFET amplifier, which is configured to amplify the incoming IF signals. The gain control is implemented using a potentiometer connected to the source terminal of the MPF102, allowing for adjustable amplification levels based on the requirements of the application.
The output of the MPF102 is fed into a 2N4126 transistor, which functions as a further amplification stage or as a buffer, depending on the circuit configuration. This transistor is capable of handling higher power levels and can effectively drive subsequent stages or loads.
The rectification of the amplified signal is performed by an 1N914 diode configured as a doubling detector. This diode is known for its fast switching speed and is suitable for high-frequency applications. The output from the rectifier is a DC voltage that represents the amplitude of the IF signal, which is then used to control other components in the circuit.
The rectified voltage is connected to a source follower stage, implemented with a transistor labeled Q14. This source follower configuration allows for impedance matching, ensuring that the output can drive the input of the 741 operational amplifier without significant signal loss. The 741 op-amp is utilized for further signal processing, providing additional gain or filtering as required by the application.
Additionally, the circuit includes S-meter and IF-gain controls. The S-meter provides a visual indication of signal strength, allowing the user to monitor the performance of the amplifier and the overall system. The IF-gain control allows for fine-tuning of the gain settings, enhancing the versatility of the circuit in different operational environments. Overall, the described configuration integrates multiple components to achieve effective signal amplification and processing for intermediate frequency applications. An MPF102 amplifier feeds IF signals to a 2N4126. A potentiometer in the MPF102 source acts as a gain co ntrol. This voltage is rectified by an 1N914 doubling detector, and drives a 741 op amp via a source follower (Q14). S-meter and IF-gain controls are provided. 🔗 External reference
Related Circuits
The rapid advancement of integrated circuit technology has led to the widespread emergence of integrated circuit amplifiers. These amplifiers exhibit high levels of technology and performance indicators. Their advantages include compact size, simplified circuitry, exceptional performance, and comprehensive protection...
The signal from a synchro receiver or a variable resistive cam follower (potentiometer) is amplified by operational amplifier U1, with its output swing constrained by back-to-back Zener diodes D3 and D4. This amplified signal is then fed into operational...
This guitar amplifier electronic architecture utilizes a robust conventional circuit design for the power amplifier, employing a single-rail supply of approximately 60V and capacitor coupling for the speakers. The advantages of this configuration for a guitar amplifier include a...
This article examines key parameters in choosing a low noise amplifier for low frequency analog applications such as buffering data converters, amplifying strain-gauge signals, and pre-amplifying microphone outputs. Low noise amplifiers (LNAs) are critical components in various analog applications that...
The primary advantage of this method of bridging is that no additional components are needed, which means that it is cheap, and there is no signal degradation from additional opamps in the circuit path. The results are at least...
This HD TV UHF wideband amplifier (Ultra High Frequency amplifier) provides a total gain of 10 to 15 dB within the frequency range of 400 to 850 MHz, making it suitable for areas with weak television signals. To ensure...