AUDIO PEAK LEVEL INDICATOR BY OP-AMP CIRCUIT SCHEMATIC DIAGRAM

AUDIO PEAK LEVEL INDICATOR BY OP-AMP CIRCUIT SCHEMATIC DIAGRAM

No setup is required: if correct values are used for resistors R3 to R7, LED D1 will illuminate at 0dB input (0.775V RMS), LED D2 at +5dB input (1.378V RMS) and LED D3 at +10dB (2.451V RMS).

The circuit was optimized for low current consumption as it was intended for battery operation. To achieve this, the best arrangement has proven to be the one using two different op-amp types for IC1 and IC2. In fact the LM393 IC was not operating satisfactorily as dot-mode LED driver, whereas the LM324 was unable to charge C2 in the linear way, as expected. Therefore, the final circuit is some op-amp wasting, but the small added cost will be quickly compensated by battery savings.

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11-90 HZ SUBWOOFER FILTER USING TL072 OP-AMP CIRCUIT SCHEMATIC DIAGRAM

11-90 HZ SUBWOOFER FILTER USING TL072 OP-AMP CIRCUIT SCHEMATIC DIAGRAM

The Subwoofer filter circuit to remove for separate pre amplifier to drive the low frequency sound a lot. In tone, call tone, normal Can not be done. is a fine deep low bass sounds like a bass drum, or at a movie complex in a low voice if we can be heard with But to add cabinets and amps. The subwoofer circuit is pass low frequency with in 11-90 Hz. Switching power supply 12V cut out if they need to use +-15V. I had change the Capacitor to cut out vocals per the red circle mark.

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6 BAND GRAPHIC EQUALIZER CIRCUIT USING 741 OP-AMP SCHEMATIC DIAGRAM

6 BAND GRAPHIC EQUALIZER CIRCUIT USING 741 OP-AMP SCHEMATIC DIAGRAM

The audiblefrequency spectrum is covered in six steps: 50Hz, 160Hz, 500Hz, 1.6kHz, 5kHz, 16kHz. All potentiometers are of 100kO linear type. The circuit provides adequate boost / cut for normal use.

power supply for the circuit can be derived from the amplifier / preamplifier itself. The wide rangeof supply voltage (6V-20V) makes the circuit very versatile. Power consumption is negligible.

list Component

R1,R2,R3,R4,R5,R6 : 27kO     C1: 100n      C6: 300pF
R7:  470kO                   C2: 33n       C7: 100uF/16V
R8:  330kO                   C3: 10n       C8: 4.7uF/16V
R9:  100kO                   C4: 3.3n      C9: 47uF/16V
R10: 4.7kO                   C5: 1n        IC1: 741 Op amp
R11: 4.7kO
VR1,VR2,VR3,VR4,VR5,VR6: 100kO Linear Potentiometers

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SIMPLE SURROUND USING OP-AMP CIRCUIT SCHEMATIC DIAGRAM

SIMPLE SURROUND USING OP-AMP CIRCUIT SCHEMATIC DIAGRAM

Although there have been similar circuits published over the years, this is a little different in a few areas. I wanted to avoid having any active electronics in the main Left and Right channels, since this eliminates any possibility of sound degradation due to the introduction of the opamps. The input impedance of 50k will not pose a problem for any preamp (including valve types), and the main signal is simply in parallel with the additional circuitry.

No volume control has been included, since you already have one in the preamp. It would just become another component to fiddle with, and since it would be rarely used, would probably become noisy over time.

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OP-AMP (LM741) PRE-AMP MIC SCHEMATIC DIAGRAM

OP-AMP (LM741) PRE-AMP MIC SCHEMATIC DIAGRAM

This is the circuit of Op-Amp Microphone Preamplifier using a single power supply, this circuit suitable for dynamic or electret microphones. Nothing too special here. The Schematic is shown using a dynamic microphone, for use with an electret a pair of suitable biasing resistor is required to power the electret microphone.

rangkaian Op-amp pre-amp micSkema rangkaian op-amp pre-amp mic

Note:

    * use a capacitor with voltage 25volt or more
    * so that the sound produced maximal use supplay good voltage, with output of 18 volts max
    * If the desired strengthening of the different, you can change the value of R1 or R2


The design is a standard non-inverting design, the input is applied to the non-inverting input of the op-amp, which is pin 3 in most cases. The input impedance is 23.5k, the overall voltage gain is determined by R2 and R1according to the following formula:

Vo = (R2 / R1) + 1

With the values of R2 and R1 on the diagram of the voltage gain (for mid band, 1kHz) is approximately 23x or 27.2dB.

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OP-AMP FOR PEMBANDING TEGANGAN CIRCUIT DIAGRAM

OP-AMP FOR PEMBANDING TEGANGAN CIRCUIT DIAGRAM

This following project serves to compare whenever the input voltage differs from two defined limits, V1 and V2. This circuit will provide an indication whenever the input voltage differs from two defined limits, V1 and V2. The supply voltage, Vcc must be higher than the highest input voltage by at least 2 volts. One application here is to monitor a 12V car battery. V1 could be set to 14V and V2 to 11V thus giving an indication of over charge or a weak battery.

The CA3140 op-amps are used to advantage as they have very little output offset voltage and can switch down to near 0volts. If any other op-amp is used such as CA741 or LF351 then it will be necessary to have an offset null control. This is just a 10k preset pins contacted between 1 and 5, the wiper connected to the negative supply rail op-amps or 4 pins.

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