Electrical Equipment Circuit

TELEPHONE_OR_EXTENSION_TONE_RINGER

Published:2009/6/25 22:06:00 Author:May

This circuit uses ML8204/ML8205 devices. With the components shown, theoutput frequency chops between 512 Hz (fH1) and 640 Hz (fH2) at a10 Hz (fL) rate.   (View)

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FCC_APPROVED_TELEPHONE_TONE_RINGER

Published:2009/6/25 22:03:00 Author:May

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TELEPHONE_TONE_RINGER

Published:2009/6/25 22:02:00 Author:May

This is a complete telephone bell replacement circuit with minimum external components with on-chip diode bridge and transient protection and direct drive for piezoelectric transducers.   (View)

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TV_MODULATOR

Published:2009/6/25 21:53:00 Author:May

The FM oscillator/modulator is a voltage-controlled oscillator, which exhibits a nearly linear output frequency versus input voltage characteristic for a wide deviation. It provides a good FM source with a few inexpensive external parts. It has a frequency range of 1.4 to 14 MHz and can typically produce a ±25 kHz modulated 4.5 MHz signal with about 0.6% total harmonic distortion.   (View)

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TV_MODULATOR

Published:2009/6/25 21:53:00 Author:Jessie

The FM oscillator/modulator is a voltage-controlled oscillator, which exhibits a nearly linear output frequency versus input voltage characteristic for a wide deviation. It provides a good FM source with a few inexpensive external parts. It has a frequency range of 1.4 to 14 MHz and can typically produce a ±25 kHz modulated 4.5 MHz signal with about 0.6% total harmonic distortion.   (View)

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CB_MODULATION_MONITOR

Published:2009/6/25 21:48:00 Author:Jessie

Connect this circuit to a transceiver with a coaxial T connector in the transmission line. Key the transmitter (unmodulated), set S1 to CAL, and adjust R2 for a full scale reading. Return S1 to MOD position. The meter will read % modulation with 10% accuracy.   (View)

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05_Hz_SQUARE_WAVE_OSCILLATOR

Published:2009/6/25 21:41:00 Author:Jessie

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MODULATION_MONITOR

Published:2009/6/25 21:41:00 Author:Jessie

Broad-tuned recelver demodulates the RF signal picked up by a loosely coupled wire placed near the transmitting antenna．   (View)

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WIDE_BAND_DIFFERENTIAL_MULTIPLEXER

Published:2009/6/25 21:37:00 Author:Jessie

This design allows high frequency signal handling and high toggle rates simultane-ously．Toggie rates up to 1 MHz and MHz signals are possible with this circuit．   (View)

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NEGATIVE_PEAK_DETECTOR

Published:2009/6/25 21:36:00 Author:Jessie

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PRECISION_SQUARER

Published:2009/6/25 21:36:00 Author:Jessie

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POSITIVE_PEAK_DETECTOR

Published:2009/6/25 21:36:00 Author:Jessie

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MULTIPLEXER／MIXER_

Published:2009/6/25 21:35:00 Author:Jessie

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FREE_RUNNING_SQUARE_WAVE_OSCILLATOR

Published:2009/6/25 21:35:00 Author:Jessie

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COMMON_SOURCE_MIXER

Published:2009/6/25 21:35:00 Author:Jessie

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EIGHT_CHANNEL_MUX／DEMUX_SYSTEM

Published:2009/6/25 21:32:00 Author:Jessie

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OSCILLATOR_CLOCK_GENERATOR_

Published:2009/6/25 21:31:00 Author:Jessie

This self-starting fixed frequency oscillator circuit gives excellent frequency stability. R1 and C1 comprise the frequency determining network while R2 provides the regenerative feedback. Diode D1 enhances the stability by compensating for the difference between VOH and VSupply. In applications where a precision clock generator up to 100 kHz is required, such as in automatic test equipment, C1 may be replaced by a crystal.   (View)

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DIFFERENTIAL_MUX／DEMUX_SYSTEM

Published:2009/6/25 21:31:00 Author:Jessie

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PRODUCT_DETECTOR

Published:2009/6/25 21:29:00 Author:Jessie

Circuit Notes The MC1596/MC1496 makes an excellent SSB product detector. This product detec-tor has a sensitivity of 3.0 microvolts and a dynamic range of 90 dB when operating at an intermediate frequency of 9 MHz. The detector is broadband for the entire high frequency range. For operation at very low intermediate frequencies down to 50 kHz the 0.1μF capacitors on pins 7 and 8 should be increased to 1.0 μF. Also, the output filter at pin 9 can be tailored to a specific intermediate frequency and audio amplifier input impedange. The ernit-ter resistance between pins 2 and 3 may be increased or decreased to adjust circuit gain, sensitivity, and dynamic range. This circuit may also be used as an AM detector by intro-ducing carrier signal at the carrier input and an AM signal at the SSB input. The carrier signal may be derived from the intermediate fre-quency signal or generated cally. The carrier signal may be introduced with or without mod-ulation, provided its level is sufficiently high to saturate the upper quad differential amplifier. If the carrier signal is modulated, a 300 mV (rms) input level is recommended.   (View)

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DIGITAL_TRANSMISSION_ISOLATOR

Published:2009/6/25 21:29:00 Author:Jessie

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