voltage controlled amplifier Archives - Amplifier Circuit Design https://amplifiercircuit.net/tag/voltage-controlled-amplifier Amplifier Project Schematic Diagram Sat, 24 Dec 2011 21:36:32 +0000 en-US hourly 1 103688205 Voltage Controlled Amplifier https://amplifiercircuit.net/voltage-controlled-amplifier.html https://amplifiercircuit.net/voltage-controlled-amplifier.html#respond Wed, 28 Sep 2011 14:33:21 +0000 http://amplifiercircuit.net/?p=576 This Voltage Controlled Amplifier circuit is simply an op amp having an additional input at pin 5. A current ILsc […]

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]]> Voltage Controlled AmplifierThis Voltage Controlled Amplifier circuit is simply an op amp having an additional input at pin 5. A current ILsc is inserted into this input which controls the gain of the device linerly. Thus by inserting an audio signal(±10 mV) within pin 2 and 3 and with controlling the current on pin 5, the amount of the signal output (pin 6) is controlled.

Parts list :
R1,R2,R5:10 K
R3 100K
R4 : 1K ( Variable resistor)
D1 : 1N4148
Q1 : 2N3905
IC1, IC2 : CA 3080

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]]> https://amplifiercircuit.net/voltage-controlled-amplifier.html/feed 0 576 Variable Gain Amplifier controlled by voltage https://amplifiercircuit.net/variable-gain-amplifier-controlled-by-voltage.html https://amplifiercircuit.net/variable-gain-amplifier-controlled-by-voltage.html#respond Sun, 25 Sep 2011 13:13:02 +0000 http://amplifiercircuit.net/?p=552 This is Variable Gain Amplifier controlled by voltage circuit function as video amplifier, it use 3 Field Effect Transistor (FET) […]

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]]> Variable Gain Video AmplifierThis is Variable Gain Amplifier controlled by voltage circuit function as video amplifier, it use 3 Field Effect Transistor (FET) type U1897E. U1897E  FET can also be replaced with a 2N4091.

The tee attenuator provides for optimum dynamic linear range attenuation up to 100 dB, even at frequency = 10.7 MHz with proper layout.

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