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  • Audio Noise Filter circuit

    2017-02-13 16:10:1478

    This audio noise filter circuit is a bandpass filter for audio frequency band. It filters unwanted signals that are lower or higher than the audio freq...

  • Active Biquadratic Band-pass Filter Circuit

    2017-02-13 15:44:3966

    For all the active filter circuits, the center frequency is 1KHz, the quality factor Q=50, and the gain Kv=100(equal to 40dB)....

  • n circuit diagram of EMI filter

    2017-02-13 15:23:5463

    In the Figure, C1 = 6.4μF, L2 = 3.5mH, C3 = 8.4μF, L4 = 3.5mH, C5 = 6.4μF. If the input and output load resistance is 50Ω, the circuit in Figure 1 ...

  • Diagram of two filter circuits used for AM broadcast interfe

    2017-02-13 15:05:0561

    AM reflecting filter in the picture (a) can be composed of common disk-type ceramic capacitor, silver capacitor, and Panasonic V series polyester capac...

  • ACTIVE_FOURTH_ORDER_HIGH_PASS_FILTER_FOR_50_Hz

    2017-02-13 14:02:3063

    This circuit which uses an LM1458 or similar op amp is a fourth-order high-pass filter with a 24 dB/octave roll-off The values of R1/R2,R3/R4,C1/C2,C3/...

  • Capacitor Input Filter Calculation

    2017-02-13 13:23:2962

    This is a simple means of calculating the required size of the input filter capacitor in a basic power supply, or calculating the peak-to-peak ripple v...

  • VARIABLE_BANDWIDTH_848_KC_CRYSIAL_FILTER

    2017-02-13 13:12:5463

    High-Q unbalanced crystal filter is easy to adjust over appreciable frequency range,Can be used in f-m oscillators, signal generators, and i-f amplifie...

  • 1_MHz_TRACKING_FILTER

    2017-02-13 13:07:3461

    Exar XR-S200 PLLIC is connected to function as frequency filter when phase-locked loop locks on input signal, to produce filtered version of input sign...

  • 1000_1_TUNING_VOLTAGE_VOLTAGE_CONTROLLED_FILTER

    2017-02-13 12:30:3765

    A standard dual integrator ftlter can be constructed using a few CA3080s. By varying IABC, the reso-nant frequency can be swept over a 1000:1 range. At...

  • CW_FILTER_1

    2017-02-13 10:08:5163

    Variable-bandwidth variable-frequency audio filter can be tuned to center frequency anywhere in range from 300 to 3000 Hz.Bandwidth can be as narrow as...

  • SUBSONIC_FILTER

    2017-02-13 06:20:0666

    This filter is a fifth-order high-pass section that provides 1 dB attenuation at 20 Hz. Below that, however, the response drops off very steeply; the -...

  • Active filter circuit with variable states

    2017-02-13 05:19:5062

    The circuit shown in figure has 2 outputs UA1 and UA2, the former is a high -pass filter output, and the latter is a band-pass filter output. The opera...

  • ONE_FILTER_THREE_PHASE_SINE_WAVE_GENERATOR

    2017-02-13 04:18:0373

    It is possible to build a three-phase sine-wave oscillator using just one UAF42 state variable filter along with some resistors and diodes. Three outpu...

  • ACTIVE_SECOND_ORDER_BANDPASS_FILTER_FOR_SPEECH_RANGE

    2017-02-13 02:23:4263

    This filter circuit which uses LM1458 or similar op amp has a response of 300 Hz to 3.4 kHz with 12 dB/octave roll-off outside the pass band. Section A...

  • CRYSIAL_RADIOTELEGRAPH_I_F_FILTER

    2017-02-13 02:12:1862

    Voltage-controlled varactor diode D1 permits remote location of potentiometer used for phasing adjustment. Circuit can be used for any i-f value from 1...

  • DIGITALLT_TUNED_LOW_POWER_ACTIVE_FILTER

    2017-02-13 01:02:1865

    This constant gain, constant Q, variable frequency filter provides simultaneous low-pass, bandpass, and high-pass outputs with the component values sho...

  • Simple_low_pass_filter

    2017-02-12 21:13:4163

    This circuit has a 6-dB per octave rolloff, after a closed-loop 3-dB point that is defined by fc(Fig. 7-41B). Gain below the fc corner frequency is def...

  • VARIABLE_HIGH_PASS_FILTER

    2017-02-12 20:10:2866

    This second order filter which should prove useful in audio applications uses an LM1458 or other similar of op amp. It is tuneable from 30 to 300 Hz cu...

  • ACTIVE_FOURTH_ORDER_LOW_PASS_FILTER

    2017-02-12 19:58:4262

    This circuit is a fourth-order low-pass filter with values for kHz. The values of R1,R2,C1 and C2, and R3, R4, C3 and C4 can be scaled for operation at...

  • SHORTWAVE_RECEIVER_IF_FILTER

    2017-02-12 19:18:4573

    An inexpensive filter can be made from microprocessor crystals. This filter has 700 Hz BW (3 dB) and has a flat response (1 dB) for about 400 to 500 Hz...

  • Various IF filters circuit

    2017-02-12 18:07:5961

    Most of the gain and selectivity of superheterodyne radio receivers are provided by the intermediate frequency (IF) amplifier. Therefore, it is a ampli...

  • High_pass_active_filter_with_Norton_amplifier

    2017-02-12 16:35:5063

    This circuit uses an LM3900 Norton amplifier as a 1-kHz high-pass filter. National Semiconductor, Linear Applications Handbook, 1991, p. 227....

  • Multiple_feedback_bandpass_filter

    2017-02-12 16:26:3463

    This circuit uses one section of a 3403 op amp with multiple feedback to form a bandpass filter. Raytheon Linear integrated Circuits, 1989, p. 4-160....

  • Various IF filters circuit

    2017-02-12 14:49:4863

    Most of the gain and selectivity of superheterodyne radio receivers are provided by the intermediate frequency (IF) amplifier. Therefore, it is a ampli...

  • Bart woz fourth-stage active low-pass filter circuit

    2017-02-12 13:47:0864

    This device is designed as the Bart woz fourth-stage active low-pass filter circuit that can be used to filter the very low frequency random impulsive ...

  • Low_offset_12th_order_max_flat_low_pass_filter

    2017-02-12 13:04:4664

    This circuit shows a 12th-order filter that uses two LTC1062s and a precision dual op amp. Figure 7-16B shows the frequency response for the following ...

  • DZW75-48/5050II high frequency rectifier filter circuit

    2017-02-12 09:52:3762

    Alternating positive and negative pulse voltage of high-frequency transformer T's secondary induction is rectified by the full-wave rectifier composed ...

  • 45_MHz_IF_AMPLIFIER_WITH_CRYSTAL_FILTER

    2017-02-12 09:11:1463

    A 40673 dual-gate MOSFET is matched to a crystal filter at 45 MHz. The filter impedance is around 2kΩ. The + 4-V source can be made variable for gain ...

  • Qualcomm AM band suppression filter circuit

    2017-02-12 09:00:3361

    Many shortwave receivers would be adversely affected in front of the critical frequency, even if the rest parts of the receiver work well. For example,...

  • Low pass filter for subwoofer

    2017-02-12 08:42:0373

    Description. Many low pass filter circuits for subwoofer are given here and this is just another one. The circuit given here is based on the opamp TL06...

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