Jumat, 24 Desember 2010

Bass-treble tone control circuit

Circuit diagram

Bass-treble tone control circuit-Circuit diagram

The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of the bass, treble, balance and volume functions through application of DC voltages from a remote control system or, alternatively, from four potentiometers which may be biased from a zener regulated supply provided on the circuit. Each tone response is defined by a single capacitor chosen to give the desired characteristic.

Features:

  • Wide supply voltage range, 9V to 16V
  • Large volume control range, 75 dB typical
  • Tone control, ±15 dB typical
  • Channel separation, 75 dB typical
  • Low distortion, 0.06% typical for an input level of 0.3 Vrms
  • High signal to noise, 80 dB typical for an input level of 0.3 Vrms
  • Few external components required

Note:

Vcc can be anything between 9V to 16V and the output capacitors are 10uF/25V electrolytic

Stereo Preamplifier With Bass Boost

Description

This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing an ac voltage gain of 4, in order to drive less sensitive power amplifiers. As modern Hi-Fi home equipment is frequently fitted with small loudspeaker cabinets, the bass frequency range is rather sacrificed. This circuit features also a bass-boost, in order to overcome this problem. You can use a variable resistor to set the bass-boost from 0 to a maximum of +16dB @ 30Hz. If a fixed, maximum boost value is needed, the variable resistor can be omitted and substituted by a switch.

Circuit Diagram:

Circuit Diagram

Parts:

  • P1 = 10K
  • P2 = 100K
  • R1 = 100K
  • R2 = 100K
  • R3 = 15K
  • R4 = 10K
  • R5 = 22K
  • R6 = 15K
  • R7 = 1K
  • R8 = 470R
  • C1 = 2.2uF-25v
  • C2 = 2.2uF-25v
  • C3 = 470uF-35v
  • C4 = 1uF-35V
  • C5 = 2.2uF-25v
  • C6 = 47nF-63v
  • C7 = 22uF-25v
  • IC1 = TL072, Opamp
  • SW1 = DPST Switch

Notes:

  • Schematic shows left channel only, but R1, R2, R3 and C1, C2, C3 are common to both channels.
  • For stereo operation P1, P2 (or SW1), R4, R5, R6, R7, R8 and C4, C5, C6, C7 must be doubled.
  • Numbers in parentheses show IC1 right channel pin connections.
  • A log type for P2 ensures a more linear regulation of bass-boost.
  • Needing a simple boost-in boost-out operation, P2 must be omitted and SW1 added as shown in the diagram.
  • For stereo operation SW1 must be a DPST type.
  • Please note that, using SW1, the boost is on when the switch is open, and off when the switch is closed.

Stereo Preamplifier with adjustment tone

Description

Many times we needed to use a simple circuit of preamplifier, with few components and facility of made. This circuit use a opamp. the Motorola, TCA5550, that contains a double amplifier, as outputs for the adjust of volume, balance, treble and bass. These adjustment of all parameters become from a line monophonic linear potesometers, increasing by far the facility of manufacture. The placement these potesometers should become as much as possible, more near in IC1, so that is minimised the noise. The circuit does not require big current in order to it work.

Circuit diagram

Circuit diagram

Part List

  • R1-2-3-4=100 Kohms
  • RV1-2-3-4=100 Kohms Linear pot.
  • C1-2-8-9=4.7uF 63V
  • C3-4=100nF 100V MKT
  • C5-14=100uF 40V
  • C6-7=47nF 100V MKT
  • C10-11-12-13=220nF 100V MKT
  • C15-16=10uF 63V
  • IC1=TCA5500 Motorola

Equalizer with Parametric Mid

Description

The circuit constitutes a natural extension of Mic-Line balance unit, but can be adapted to any other audio circuit. It is made up of two units in the series : A) A classic unit bass/ Treble and B) a parametric unit of mid frequencies. Both units can also be used autonomously or each one separately, with the required buffer unit, from previous and subsequent circuits. With the R2 we requlate the High frequencies +/- 18 db/oct at 20 KHZ, with R5 the Low frequencies +/- 18bd/oct at 20 KHZ, with R11 the Mid freq. +/- 15 db/oct and with R10 the center of mid freq. at 200 HZ - 6 KHZ band.

Circuit diagram

Circuit diagram

Part list

  • R1-3=2.7 Kohms
  • R4=22 Kohms
  • R6-7=5.6 Kohms
  • R8-9=22 Kohms
  • R12-13=3.9 Kohms
  • R14=47 Kohms
  • R15=100 ohms
  • R2-5-11=47 Kohms Lin. pot.
  • R10=2X100 Kohms Log. pot
  • C1=2.2nF 100V MKT
  • C2-3=5.6nF 100V MKT
  • C4=68pF mylar
  • C5=10nF 100V MKT
  • C6=4.7nF 100V MKT
  • C7=10uF25V
  • C8-9=100nF 100V MKT
  • IC 1= NE 5532
  • All Resistors is 1/4W 1%

Digital Volume Control

Description

This circuit could be used for replacing your manual volume control in a stereo amplifier. In this circuit, push-to-on switch SW1 controls the forward (volume increase) operation of both channels while a similar switch SW2 controls reverse (volume decrease) operation of both channels. A readily available IC from Dallas semiconductor, DS1669 is used here.

Circuit Diagram:

Circuit Diagram:

Parts:

  • J1 = RCA Audio Input Socket
  • J2 = RCA Audio Input Socket
  • C1 = 0.1uF-16V Ceramic Disc Capacitor
  • C2 = 0.1uF-16V Ceramic Disc Capacitor
  • C3 = 0.1uF-16V Ceramic Disc Capacitor
  • IC1 = DS1669 (is available from Dallas SCo.
  • SW1 = Momentary Push Button Switch
  • SW1 = Momentary Push Button Switch

Notes:

  • Replaces mechanical variable resistors.
  • Electronic interface provided for digital as well as manual control.
  • Wide differential input voltage range between 4.5 and 8 volts.
  • Wiper position is maintained in the absence of power.
  • Low-cost alternative to mechanical controls.
  • Applications include volume, tone, contrast, brightness, and dimmer control.
  • The circuit is extremely simple and compact requiring very few external components.
  • The power supply can vary from 4.5V to 8V.
  • The input signal should not fall below -0.2 volts.

10 Band Graphic Equalizer

Description

The circuit of graphic equalizer, allocates ten adjusting potesometer , that each one from them affects in a predetermined area of frequencies, the central frequency of which abstains a octave (double), from the central frequencies of her neighbouring regions. Each unit has common materials with remainder and it differs only in the capacity of capacitors that constitutes the filter in each unit. When the runner of fader regulation RV1 until RV10, is in the middle then we do not have no intervention of filter above in the signal that passes from in his and gain of particular unit, is one [ X1 ]. On the contrary if the runner is moved to a side of exit, the unit acts as filter of cutting off of area and it degrades the signals of predetermined area of frequencies. On the contrary if it is moved to the side of entry, the rung acts as filter of passage of area, strengthening the signals of predetermined area of frequencies. The quality of all materials should be very good. Specifically potesometer RV1... the 10 and capacitors. If it is intended for stereo use then it will be supposed it is made in two pieces with as much as possible suited the materials, between the channels, so that do not exist differences in the regulation of each band frequencies. Switch S1 isolates the circuit EQ, when him we did not need and it ensures level [ flat ] response in the exit of circuit. The circuit should be connected between preamplifier and in a final power amplifier.

Circuit diagram

Circuit diagram

Part List

  • R1....20= 10Kohms
  • R21....40= 1Mohms
  • R41= 10Kohms
  • R42= 1Kohms
  • R43.....52= 2.2Kohms
  • R53.....62= 47Kohms
  • R63-64-66-67= 47Kohms
  • R65= 10Kohms
  • R68-69= 47 ohms 1/2W
  • RV1....10= 100Kohms lin FADER
  • RV11= 10Kohms log.
  • C1= 180nF polyester
  • C2= 18nF polyester
  • C3= 100nF polyester
  • C4= 10nF polyester
  • C5= 47nF polyester
  • C6= 4.7nF polyester
  • C7= 22nF polyester
  • C8= 2.2nF polyester
  • C9= 12nF polyester
  • C10= 1.2nF polyester
  • C11= 5.6nF polyester
  • C12= 560pF polysterine
  • C13= 2.7nF polyester
  • C14= 270pF polysterine
  • C15= 1.5nF polyester
  • C16= 150pF polysterine
  • C17= 680pF polysterine
  • C18= 68pF polysterine
  • C19= 360pF polysterine
  • C20= 36pF polysterine
  • C21= 4.7uF polyester
  • C22-23= 33pF polysterine
  • C24= 10uF 25V
  • C25-26= 47uF 25V
  • C27...32= 47nF polyester
  • IC1...3= TL074
  • S1= 2X4 SW for stereo

6-Band Graphic Equalizer

Description

The EQ-2 it is a circuit of graphic equalizer 6 band of regulation. Each band is regulated from the potesometers RV1-6, that are, for better optical indicate of regulations, Fader. This does not mean that we cannot him replace with simply potesometer. In the center of regulation potesometer, the gain is null (flat), but in terminal has +/- 15 db, boost or cutting off, respectively. For stereo operation, it will be supposed two times.

Circuit diagram

Circuit diagram

Part list

  • R1=47Kohms
  • R2-5-18=150Kohms
  • R3-4=10Kohms
  • R6....17=10Kohms
  • R19=100Kohms
  • RV1.....6=100Kohms Lin.
  • C1=1uF 100V
  • C2=15nF 100V
  • C3=150nF 100V
  • C4=33nF 100V
  • C5=8.2nF 100V
  • C6=1nF 100V
  • C7=470pF 100V
  • C8=680nF 100V
  • C9=680nF 100V
  • C10=150nF 100V
  • C11=39nF 100V
  • C12=8.2nF 100V
  • C13=2.2nF 100V
  • C14=470nF 100V
  • IC1-2=TL074

5 Band Graphic Equalizer

Description

Other one unit of graphic EQ. five bands. The basic difference with the other circuits is, that I use instead of IC, transistor and the power supply, go up in +/- 24V DC, ensuring low distortion and bigger margins of overloading. With switch S1, we can isolate the EQ. inside or except operation, leaving the musical signal to pass without no alteration.

Circuit diagram

Circuit diagram

Part list

  • R1-4-37= 330Kohms
  • R2-7= 2.2Kohms
  • R3= 120Kohms
  • R5-6= 6.8Kohms
  • R8....12= 1.8Kohms
  • R13....15= 200Kohms
  • R16= 180Kohms
  • R17= 150Kohms
  • R18= 1.5Kohms
  • R19....22= 1Kohms
  • R23....27= 220Kohms
  • R28....32= 15Kohms
  • R33= 10Kohms
  • R34= 15Mohm
  • R35-38= 220 ohms 1W
  • R36= 100 ohms
  • C1-3= 1uF 40V
  • C2= 68pF 100V
  • C4= 220uF 63V
  • C5= 1uF 100V
  • C6= 220nF 100V
  • C7= 47nF 100V
  • C8= 15nF 100V
  • C9= 5.6nF 100V
  • C10= 47nF 100V
  • C11= 15nF 100V
  • C12= 4.7nF 100V
  • C13= 1.5nF 100V
  • C14= 470pF 100V
  • C15= 68pF 100V
  • C16-19= 100nF 100V
  • C17-20= 470uF 40V
  • C18= 4.7uF 63V
  • RV1....5= 50Kohms Lin.
  • Q1.....7= BC550C
  • S1= 2X2 SW

3 Band Equalizer

Description

A classic circuit of regulation of tone of three way, with which we can regulate low, mid and high frequencies, of acoustic signal. The boost/cut can be regulated in the range of ± 18 dB/oct. In the circuit the supply is ± 15V, but can be also supplied with alone supply + 9 until + 30V, it is enough it is connected pin the 4 IC1, in the 0V and is connected the circuit with as it appears in fig. 2, giving half the supply in the not inverting entry of IC1, in the 5 and 3 equivalents, which are henceforth not connected in the ground.

Circuit diagram

Circuit diagram

Part list

  • R1-2= 47Kohms
  • R3-4-5-12-13= 10Kohms
  • R6-7= 3.3Kohms
  • R8-9= 1.8Kohms
  • R10= 270ohms
  • R11= 22Kohms
  • C1-11= 10uF 25V
  • C2= 33pF ceramic
  • C3= 2.2uF 63V MKT
  • C4= 47nF 63V MKT
  • C5-7= 4.7nF 63V MKT
  • C6= 22nF 63V MKT
  • C8= 1.2nF 63V MKT
  • C9-10= 100nF 63V MKT
  • C12=47uF 25V
  • RV1-2= 100Kohms Lin.
  • RV3= 470Kohms Lin.
  • IC1= TL072, NE5532

Bass Booster Circuit

Description

Bass Boost is today's sound... whether it's the driving, gut-vibration pulsation of disco, or the solid bass line of soft, hard, or laid-back rock. One way to get the modern bass-boost sound without running out and buying an all-new expensive piece of equipment is to use a Bass Booster between your guitar, electronic organ or what-have-you, and the instrument amplifier. A bass booster strips the highs from the instrument's output signal and amplifies low frequencies, feeding on "all-bass" sound to the instrument amplifier. Naturally, the bigger the speaker used with the amp, the more powerful the bass: use 15-inchers with the Bass Booster and you can rattle the windows. Bass Booster is powered by an ordinary 9 volt transistor radio battery. It can be assembled on a small printed board or on a veroboard using point to point wiring. The booster connects between your instrument and its amplifier through two standard RCA Jacks.

Circuit diagram:

Circuit diagram

Parts:

  • P1 = 50K
  • P2 = 100K
  • R1 = 22K
  • R2 = 470K
  • R3 = 47K
  • R4 = 10K
  • R5 = 470R
  • R6 = 1K
  • Q1 = 2N2222
  • C1 = 2.2uF-25v
  • C2 = 100nF-63v
  • C31 = 00nF-63V
  • C4 = 3.3uF-25v
  • C5 = 470uF-25v
  • D1 = 5mm. Red Led
  • Q1 = 2N2222
  • B1 = 9v Battery
  • J1 = RCA Audio Input Socket
  • J2 = RCA Audio Output Socket
  • S1 = On-Off Switch

Using Bass Booster:

Connect your electronic guitar or other electronic instrument to input jack J1; Connect output jack J2 to your instruments amplifier's normally-used input. With power switch S1 off, key S2 so the instrument feeds directly to the instrument amplifier. With P2 set full counter-clockwise (Off), turn power switch S1 on, key S2 once, and advance P2 for the desired Bass Boost level. To cut back to natural sound just stomp down on S2 and key the Bass Booster out. Don't worry about leaving power switch S1 on for several hours of a gig. The circuit pulls less than 1mA from the battery, so battery will last many, many months.

3 Line Mixer

This project is a 3 or more lines mixer. For more than 3 inputs you can repeat the input parts (P=10K R=22K). It powered with 9Vdc.

circuit diagram

Componets Layout

PCB (5,5cm x 4,4cm)