DELTA_SIGMA_MODULATION_FOR_DIGITALCOMMUNICATIONS

Published:2009/7/20 23:35:00 Author:Jessie

Flip-flop sampling pulse generator supplies 5-mlcrosec pulses at 3-kcprr to modulator that also has analog signal input. Integrated difference signal fires Schmitt trigger to provide positive output that opens gate, passing square-wave pulse that sets flip-flop. Output of flip-flop is fed to emitter-follower and demodulated by ac five low-pass liter having 50-cps cutoff.-H. Inose et al, New Modulation Technique Simplifies Circuits, Electronics, 36:4, p 52-55.   (View)

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Overtone_crystal_oscillator_with_operating_range_of_20_MHz_to_100_MHz_depending_on_crystal_selection_and_tank_tuning

Published:2009/7/20 23:32:00 Author:Jessie

Overtone crystal oscillator with operating range of 20 MHz to 100 MHz depending on crystal selection and tank tuning. VEE is -5.2 volts (courtesy Motorola Semiconductor Products Inc.).   (View)

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Multicrystal_RF_oscillator_for_the_20_MHz_to_20_MHz_range

Published:2009/7/20 23:30:00 Author:Jessie

Multicrystal RF oscillator for the 2.0 MHz to 20 MHz range (courtesy Motorola Semiconductor Products Inc.).   (View)

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Fundamental_crystal_oscillator_for_1_MHz_to_20_MHz

Published:2009/7/20 23:28:00 Author:Jessie

Fundamental crystal oscillator for 1 MHz to 20 MHz. VEE is -5.2 volts (courtesy Motorola Semiconductor Products Inc.).   (View)

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Voltage_controlled_oscillator_using_an_MC1648

Published:2009/7/20 23:18:00 Author:Jessie

Voltage-controlled oscillator using an MC1648. This VCO is tunable from 110 MHz to 145 MHz. The control voltage range is 1.8 volts at 110 MHz to 5 volts at 145 MHz (courtesy Motorola Semiconductor products Inc.).   (View)

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100_MHz_oscillator_and_buffer

Published:2009/7/20 23:17:00 Author:Jessie

100 MHz oscillator and buffer (courtesy Texas Instruments Incorporated).   (View)

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105_MHz_gate_1_contraolled_BF_amplifier_using_a_TIS152_dual_gate_MOSFET

Published:2009/7/20 23:15:00 Author:Jessie

105 MHz gate-1-contraolled BF amplifier using a TIS152 dual-gate MOSFET(courtesy Texas Instruments Incorporated).   (View)

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1_second_reference_oscillator

Published:2009/7/20 23:15:00 Author:Jessie

1-second reference oscillator. This circuit is ideal for clock circuits where no 60-hertz line is available (courtesy Intersil, Inc.).   (View)

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10_watt_and_25_watt_marine_bano_transmitters_

Published:2009/7/20 23:13:00 Author:Jessie

10-watt and 25-watt marine bano transmitters (courtesy Motorola Semiconductor Products Inc.).   (View)

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Watchdog_light_sensitive_oscillator

Published:2009/7/20 23:11:00 Author:Jessie

Watchdog light-sensitive oscillator. The basic circuit is a relaxation oscillator that sounds an alarm through a speaker or earphone. R2 is set for a bias current just below the firing level (courtesy General Electric Company).   (View)

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25_watt_marine_band_transmitter

Published:2009/7/20 23:11:00 Author:Jessie

25-watt marine band transmitter. See page258 for parts list,   (View)

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Voltage_controlled_sine_wave_oscillator_for_up_to_50_kHz

Published:2009/7/20 23:10:00 Author:Jessie

Voltage-controlled sine-wave oscillator for up to 50 kHz. For frequencies of 10 kHz to 50 kHz capacitor Cc should be 3 pF. For frequencies less than 10 kHz capacitor Cc should be 30 pF. Select capacitor C according to desired frequency, or make it variable from zero to 5 μF (courtesy Fairchild Semiconductor).   (View)

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10_watt_marine_band_transmitters

Published:2009/7/20 23:08:00 Author:Jessie

10-watt marine band transmitters. See page-for parts list.   (View)

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200_MHz_crystal_oscillator

Published:2009/7/20 23:07:00 Author:Jessie

200 MHz crystal oscillator. This circuit incorporates a 100 MHz oscillator and a frequency doubler. VEE is -5.2 volts (courtesy Motorola Semiconductor Products Inc.).   (View)

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DIFFERENTIAL_INPUT_AND_OUTPUT

Published:2009/7/20 23:07:00 Author:Jessie

Preamplifier for servo system uses 90° operational integrator to drive MC1420 opamp having differential input and differential output connected in inverting configuration. With values shown, voltage gain is about 38 dB. Bandwidth is about 4 kHz, giving stability when using 510-pF compensating capacitors. Zener provides 12 V required for opamp operation from single supply,-A, Pshaenich, Servo Motor Drive Amplifiers, Motorola, Phoenix, AZ, 1972, AN-590.   (View)

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20W_AT_60_Hz

Published:2009/7/20 22:55:00 Author:Jessie

Adding high-current oomph mentary transistors to opamp gives servoam-plifier with 115-V output. Opamp drives low impedance of 10-V filament transformer connected in reverse to boost output to 115 V for driving servo. Use heatsink for transistors. Bringing opamp feedback resistor to actual out-put point makes nonlinearities and crossover point between transistors insignificant by placing them in feedback loop.-I. Math, Math's Notes, CQ, Jan. 1978, p 53-54 and 70.   (View)

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105_MHz_to_107_mixer_for_FM_operation

Published:2009/7/20 22:55:00 Author:Jessie

105 MHz to 10.7 mixer for FM operation (courtesy Texas Instruments Incorporated).   (View)

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Digitally_programmed_oscillator

Published:2009/7/20 22:54:00 Author:Jessie

Digitally programmed oscillator. The circuit uses an AD537 monolithic V/F converter and an AD7520 multiplying D/A convener. It is a programmable square wave frequency source with excellent linearity in the range of0 to 100 kHz (courtesy Analog Devices, Inc.).   (View)

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Quadrature_oscillator_using_an_ECG947_dual_operational_amplifier_IC

Published:2009/7/20 22:53:00 Author:Jessie

Quadrature oscillator using an ECG947 dual operational amplifier IC. The ECG947 is short-circuit proof and requires no external components for frequency compensation (courtesy GTE Sylvania Incorporated).   (View)

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OPERATIONAL_INTEGRATOR_PHASE_SHIFTER

Published:2009/7/20 22:52:00 Author:Jessie

Motorola MPSA13 Darlington IC provides 90° phase shift required in servo amplifier for 115-V 60-Hz servomotor. Two cascaded 2N3904 discrete Darlingtons can be used in place of IC.-A. Pshaenich, Servo Motor Drive Amplifiers, Motorola. Phoenix, AZ, 1972, AN-590.   (View)

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