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: ELECTRONIC LEARNING - FUN "- Series of Modular Control Center. Circuit has two inputs were activated by high levels of SW1, followed by IC1A gain high input impedance buffer. Driving the output of the buffer circuit Loudness passive network.
List of Components: P1______________47K Log. Potentiometer (twin concentric-spindle dual gang for stereo) R1, R2, R3 R4_______100K Resistors 1/4W, 1/4W R14_________560R R5_______________1K Resistors 1/4W Resistor R6, R7, R8 R10_______10K Resistors 1/4W, 1/4W Resistors R9___________22K R11_____________68K 1 / 4W R12______________1K5 1/4W Resistor Resistor Resistor 1/4W R13_____________12K C1_______________1μF 63V Polyester Capacitor lights banner C2, C3__________100pF 63V Polystyrene or Ceramic Capacitors Polyester Capacitors C5______________22nF C4______________47nF 63V 63V 63V Polyester Capacitor C6_____________220pF Polystyrene or Ceramic Capacitor C7, C8 C10_________100nF 63V Polyester Capacitors, Electrolytic 25V C11___________4μ7 C9 Capacitors, Electrolytic Capacitors IC1___________TL072 C12________2200μF 25V Dual Op-Amp BiFET IC2___________78L15 15V 100mA Positive Regulator IC IC3___________79L15 15V 100mA Negative Regulator IC D1, D2________1N4002 1A 200V Diodes SW1____________DPDT Toggle Switch SW2____________2 poles 3 ways Rotary Switch J1, J2, J3, J5____RCA audio input sockets J4_____________Mini lights banner DC Power Socket
SW2A control switch allows the choice of two different frequency compensation curves for use when the program reproduced sound at low levels. The curves lights banner should be used with low to mid-level reproduction, in practice when the volume control buttons arranged around lights banner the second quarter of the trip. Curve II is best suited to very low levels, ie when the volume control lights banner buttons lights banner arranged around the first quarter. To get a perfectly flat frequency response, Loudness control must be set in the OFF position.
The following Op-Amp (IC1B) provides all the advantages required by the preamplifier, featuring 166mV RMS input sensitivity at 1.5 Volts RMS output with very low distortion. Therefore, the input amplifier capable of driving low power sensitivity.
Dual rail power supply is needed for this series of Modular Control Center taken from a single voltage AC 15-18 Volt appropriate adapter provided by an external Power Supply. D1 and D2 rectify glombang each half positive and half negative wave in order to obtain dual rail voltage polarity is opposite. IC2 and IC3 provide a good supply of about 15 Volts DC regulated properly to Op-Amps.