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Category: Inside Circuits Views: 1527 Rank: 0 An audio signal applied to VI is passed through the operational amplifier 741, U2. After being amplified, the output signal V2 is sampled and applied to a negative voltage doubler / rectifier circuit composed of diodes CRI and CR2, with the capacitor C1. The resulting negative voltage is used as a control voltage which is applied to the door] 2N5485 FET Q1. Capacitor C2 and resistor R2 form a filter for smoothing the voltage rectified audio control. The lFET is connected between pin 2 of the MC3340P grounded by a resistor of 1 kohm..  As the voltage applied to the gate of FET] becomes more negative in magnitude, the channel resistance of FET] increases causing lFET to function as a voltage-controlled resistor. The MC3340P audio attenuator is the heart of the MCO. It is capable of 13 dB of gain or almost - 80 dB of attenuation as a function of external resistor placed between Pin 2 and ground. An increase in resistance decreases the gain from the MC3340P. The gain of the circuit is not entirely a linear function of the external resistance, but such behavior is similar across much of the gain / attenuation range. An input signal applied to the input of the AGC will cause the gate volt age the proportion lFET become negative. Accordingly, the JFET increases the resistance of the pin 2 to ground the MC3340P causing a reduction in gain. In this way, the AGC output is kept almost constant. Datasheet file1: Click here to download LM741.pdf datasheet. Datasheet file2: Click here to download MC3340P.pdf datasheet. Datasheet file3: Click here to download 2N5485.pdf datasheet. Datasheet file4: Click here to download 1N270.pdf datasheet.
Related circuits By using two switching transistors and two LEDs, this circuit can distinguish low-level ac and dc signals. If the red LED i Using a Thomson TEA2025, this stereo amplifier provides 1 W per charuiel into 4 with a 9-V supply. Input sensitivity is 25 mV p-p for full output. The Class A series resonant inverter portrayed is well-known and respected for its high efficiency, low cost, and small size, provided that operating frequency is greater than about 3 kHz. 800 To 1000Mhz Scanner Converter Circuit This converter enables reception of 800 to 1000 MHz on any scanner covering the 400 to 500-MHz range. The converter can be set up to cover either 800 to 900 MHz or by readjustment 900 to 1000 MHz. Sensitivity is very high because of the GASFET front end. Light-Controlled Oscillator Circuit This circuit can be used as a light detector and possibly as an aid for the visually handicapped. The circuit offers independent control of initial delay and pulse rate. ICIc is connected as a pulse generator whose operation is inhibited by the normally low O/P of the ICla. When the circuit input goes low i.e., by pressing PB1, IClb O/P goes high and the circuit O/P goes low thus replicating... The ac line power is brought back into the circuit through Fl, a protective 5-A fuse. One side of the ac line is connected to one side of each ac outlet. The other side of the ac line is connected to each SGR or silicon-controlled rectifier. Each SCR is, in turn, connected to the other side of... Temperature control is achieved using the REF-02 +5 V Reference/Thermometer and a CMP-02 Precision Low Input Current Comparator. The CMP-02 turns on a heating element driver (Ql) whenever the present temperature drops below a setpoint temperature determined by the ratio of Rl to R2
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I tried my best to adjust the circuit components but failed too many times. I tried to cascade two MAX2611 to give me 100 voltage gain but the problem is the oscillation and sometimes the input will be distorted! I have no idea ...
The two important initial assumptions for the ideal op-amp are: First,the op-amp circuit has infinite gain and second, it has infinite input impedance. The infinite gain means that if the inverting amplifier is operating within the ...
Ok I have the following circuit, with values of variables: \$\displaystyle R_{1} = 1 M\Omega, R_{2}=10k\Omega,~~ k_{n}.
From there we go to this sentence, "Besides noise configuration, an increase in amplifier gain will decrease in the bandwidth (BW) of the circuit, meaning some valuable data may get eliminated from the input signal (the ...
The circuit graph here shows the input (mV) &. Input Voltage (mV). Output Voltage (V). output of an AC amplifier circuit, with the same. 150. gain as the previous example. The RMS input can. be changed by adjusting the green ...
Furthermore, it is fully output short-circuit proof. Therefore, this circuit was implemented with a single 5532 chip forming a pair of stereo, inverting amplifiers, having an ac gain of about 3.5 and capable of delivering up to 3.6V ...
Electronic Circuits - General Amplifier Theory 1 - Gain
Electronics: "Basic Amplifiers" pt1-2 1963 US Army Training Film
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