Audio Circuit

WIDEBAND_ANTENNA_PREAMPLIFIER

Published:2009/6/15 21:02:00 Author:May

This wideband antenna preamplifier has a gain of around 20 dB from 40 to 860 MHz, covering the entire VHF, FM, commercial, and UHF bands. A phantom power supply provides dc to the preamp via the coaxial cable feeding the unit.   (View)

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VLF_60_kHz_ANTENNA_PREAMP

Published:2009/6/15 20:57:00 Author:May

Suitable for 60-kHz standard frequency reception, here is a schematic for a FET preamp and antenna.   (View)

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GENERAL_PURPOSE_PREAMPLIFIER

Published:2009/6/15 4:08:00 Author:May

Suitable for general audio use, the preamp circuit uses a feedback pair. Current gain is set by the ratio of (R4 + R6)/R4.   (View)

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AUDIO_TO_UHF_PREAMP

Published:2009/6/15 3:57:00 Author:May

The Signetics NE5204 or NE5205 can be used in this AF to 350-MHz (-30 dB) preamp. If 600MHz @ 3dB is needed, use the NE5205. The noise figure is 4.8dB at 75Ω, 6dB at 50Ω. Gain is approximately +20dB over the passband.   (View)

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FREQUENCY_COUNTER_PREAMP

Published:2009/6/15 3:56:00 Author:May

Based on the LM733 or NE592, the preamp shown has a bandwidth of 100 MHz. The FET inputs provide about 1-MΩ input impedance. Q4, Q5, and IC2 provide signal conditioning.   (View)

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GENERAL_PURPOSE_JFET_PREAMP

Published:2009/6/15 3:31:00 Author:May

This JFET preamplifier has a gain of about 20dB and a bandwidth of over 100kHz. It is use-ful as a low-level audio amplifier for high-imped-ance sources.   (View)

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Balanced Output Circuit Composed of Double Operational Amplifier

Published:2011/7/18 2:55:00 Author:Sue | Keyword: Balanced, Output, Double, Operational Amplifier

The picture shows the balanced output circuit composed of double operational amplifier.   (View)

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Four-input Audio Mixer Circuit

Published:2011/7/20 6:09:00 Author:Sue | Keyword: Four-input, Audio Mixer

The picture shows a follower-type four-input audio mixer circuit. The circuit has four inputs. By adjusting the relative values of 470KM input resistor and 470KM feedback resistor, every input and every output will keep a gain of 1.   (View)

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Microphone Low Noise Audio Preamplifier Circuit

Published:2011/7/18 6:50:00 Author:Sue | Keyword: Microphone, Low Noise, Audio, Preamplifier

As seen in the figure, MC2830 will compose audio circuit. Traditional audio circuit cannot tell the difference between audio signal and noise signal. When it is very noisy, it is always the switch that make the noise. To avoid such disadvantage, we use different audio and noise wave forms. Audio wave form always has wide rangeability while noise wave form is more stable. Audio activation is decided by R6. If R6 changes from 14K to 0.7K, audio activation's sensibilitywill become lower.   (View)

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DVD Player Power Circuit

Published:2011/7/14 7:20:00 Author:Sue | Keyword: DVD Player, Power

In DVD player power circuit, it is easy for TEA1521 toserve as flyback power.   (View)

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High-precision Analog Signal Isolating Amplifier

Published:2011/7/20 6:44:00 Author:Sue | Keyword: High-precision, Analog Signal, Isolating Amplifier, Isolating Operational Amplification, Isolating Operational Amplifier

Typical applications: Direct current/voltage signal's isolation, transformation and amplication. Industrial site signal's isolation and long-term transportation. Analog signal's jamming and suppression of ground wire and statistics' isolation and collection. Instruments and meters and sensor signal's reception and dispatch. Non electrical quantity signal's conversion. Power distribution, armarium's isolators. Functions such as isolation of signal sensor's one-in-one-out, two-in-two-out of analog signal of 4-20mA. ISO series optoelectronic isolation amplifier uses direct current signal imitation modulation technique. The null point and full scale within the range can be adjusted and set according to the sensor.   (View)

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Computer Mainboard ATXPWROK Control Circuit

Published:2011/7/19 7:52:00 Author:Sue | Keyword: Computer Mainboard, Control

When it is working, ATXPWROK is high level. Q45 is connected and Q44 is disconnected. +12V voltage will be put on Q43 and Q24's pin 2 through resistors, that is binary channels MOS tube's N channel's control pin is high level and the channel is connected. At that time, VCC voltage will output 5V USB voltage from pin7,pin8 through N-type MOS tube. At the same time, when ATXPWROK is high level, ATXPWROK # is low level, then ANT GATE U26 outputs low level. Q40 is disconnected and will output high level control signal to Q43 and 24's pin 4, that is binary channel MOS tube's P-type channel is disconnected. Then pin 5, pin 6 have no output current, that is 5VSB doesn't supply 5VUSB voltage.   (View)

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The food humidity detector circuit (2)

Published:2011/7/21 0:21:00 Author:Borg | Keyword: humidity detector circuit

(View)

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Balanced transmission mode circuit diagram

Published:2011/7/16 9:44:00 Author:Sophia | Keyword: Balanced transmission mode

Figure is the balanced transmission mmode using twowire. This mode sends two signals with the 180 ° phase difference, and receive differeence of these two signals. Two signal lines can be offset if there is the noise between two signals. Balanced transmission is basically a low output impedance and high input impedance mode. The transmission line needs to use the two-wire shielded cable with excellent frequency characteristics and low distributed capacitance.   (View)

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CX2O111--the Am/Fm radio integrated circuit

Published:2011/7/15 19:14:00 Author:Borg | Keyword: Am/Fm radio, integrated circuit

CX2O111 is the AM/FM radio integrated circuit produced by Sony, which is used in radios, recorders, compound stereos and so on.1.the internal circuit and pin functions of CX2O111CX2O111 includes all the circuits of the AM/FM and efficiency, mix, INTREQ and detected wave output audio signals. This IC is in 24-pin dual line flat package, whose internal circuit is shown in Figure 1 and the pin functions and data are listed in table 1. Figure 1. the internal circuit of CX2O111   (View)

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TEANA A33-EL Electrical Load Signal Circuit One

Published:2011/7/14 8:43:00 Author:Joyce | Keyword: TEANA, Electrical Load , Signal

TEANA A33-EL Electrical Load Signal Circuit   (View)

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TEANA A33-EL Electrical Load Signal Circuit Two

Published:2011/7/14 8:43:00 Author:Joyce | Keyword: TEANA , Electrical Load , Signal

TEANA A33-EL Electrical Load Signal Circuit   (View)

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TEANA A33-EL Electrical Load Signal Circuit Three

Published:2011/7/14 8:43:00 Author:Joyce | Keyword: TEANA , Electrical Load , Signal

TEANA A33-EL Electrical Load Signal Circuit   (View)

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A 5W Frequency Modulation Transmitter Power Amplifier Circuit

Published:2011/7/20 3:16:00 Author:Joyce | Keyword: 5W , Frequency Modulation Transmitter, Power Amplifier

High frequency oscillation signal from output end IF of the varactor tuner of the television is used as the signal source. The tuner has a stable oscillation frequency, adding an 8 V voltage on input voltage BT would enable it to output stable frequency as long as the voltage is no less than 9 V. A coupling capacitance of several P should be added on the input end under operation. If the third stage amplifier gets too hot, two transistors should be connected with it in parallel .Adjusting the density of the inductance coil means adjusting the frequency-selecting loop.   (View)

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Mega Bass Circuit

Published:2011/7/20 3:16:00 Author:Joyce | Keyword: Mega Bass

The mega bass circuit is as shown in the figure.   (View)

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