Oscillator Circuit

CRYSTAL_OSCILLATOR_DOUBLER

Published:2009/6/24 23:30:00 Author:May

Circuit Notes The crystal operates into a complex load at series resonance. L1, C1, and C2 balance the crystal at zero reactance. Capacitor C1 fine-tunes the center frequency. Tank circuit L2, C3 doubles the output frequency the circuit operates as an FM oscillator-doubler.   (View)

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OVERTONE_OSCILLATOR_WITH_CRYSTAL_SWITCHING

Published:2009/6/24 23:18:00 Author:May

Circuit Notes The large inductive phase shift of L1 is compensated for by C1. Overtone crystals have very narrow bandwidth; therefore, the trimmer has a smaller effect than for fundamental-mode operation.   (View)

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CRYSTAL_CONTROLLED_BUTLER_OSCILLATOR

Published:2009/6/24 23:13:00 Author:May

Circuit NotcsA typical Butler oscillator (20-100 MHz) uses an FET in the second stage; the circuit is not reliable with two bipolars. Sometimes two FETs are used. Frequency is determined by LC values.   (View)

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FIFTH_OVERTONE_OSCILLATOR

Published:2009/6/24 23:06:00 Author:May

Circuit NotesThis circuit isolates the crystal from the dc base supply with an rf choke for better starting characteristics.   (View)

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50_MHz_150_MHz_OVERTONE_OSCILLATOR

Published:2009/6/24 23:02:00 Author:May

  (View)

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SCHMITT_TRIGGER_CSCILLATOR

Published:2009/6/24 22:57:00 Author:May

Circuit NotesA Schmitt trigger provides good squaring of the output, sometimes eliminating the need for an extra output stage.   (View)

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VOLTAGE_CONTROLLED_TWO_PHASE_OSCILLATOR

Published:2009/6/24 22:00:00 Author:May

This circuit uses two multipliers for integration-with-contro llable-time -constants in a feedback loop. R2 and R5 will be recognized in the AD534 voltage-to-current configuration; the currents are integrated in C1 and C3, and the voltages they develop are connected at high impedance in proper polarity to the X inputs of the next AD534. The frequency-control input, EY, varies the integrator gains, with a sensitivity of 100 Hz/V, and frequency error typically less than 0.1% of full scale from 0.1V to 10V (10 Hz to 1 kHz). C2 (proportional to C1 and C3), R3, R4 provide regenerative darnp-ing to start and maintain oscillation. Z1 and Z2 stabilize the amplitude at low distortion by degenera-tive damping above ±10V.   (View)

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THREE_DECADE_VCO

Published:2009/6/24 21:59:00 Author:May

A range of 10 Hz to 10 kHz is covered by this circuit.   (View)

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4093_CMOS_VFO

Published:2009/6/24 21:52:00 Author:May

Two gates of a Quad 4093 are used in an astable multivibrator. C1 is a three-gang 365 pF variable capacitor with sections paralleled. S3 and S4 switch in optional extra capacitors.   (View)

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SIMPLE_AUDIO_TEST_OSCILLATOR

Published:2009/6/24 21:50:00 Author:May

An 88-mH surplus telephone toroidal coil is used in a 1-kHz oscillator. Up to 8 V p-p into a high-Z load is available. THD is 0.9%.   (View)

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4093_CMOS_ASTABLE_OSCILLATOR

Published:2009/6/24 21:48:00 Author:May

Two gates of the Quad 4093 are used to make an oscillator. RX can be from about 5 kΩ to around 10 MΩ. CX can be from about 10 pF to many μF, the limit being set by the leakage of the capacitor. Frequency is approximately 2.8/RXCX (R MΩ, Cmfd).   (View)

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VARIABLE_DUTY_CYCLE_OSCILLATOR

Published:2009/6/24 21:42:00 Author:May

Using a potentiometer and steering diodes, this 1.2-kHz oscillator will provide 1 to 99% duty cycle. Vary C1 to change frequency.   (View)

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WIEN_BRIDGE_AUDIO_OSCILLATOR

Published:2009/6/24 21:39:00 Author:May

For variable-frequency operation, R1 and R2 can be replaced by a dual potentiometer.   (View)

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PRECISION_GATED_OSCILLATOR

Published:2009/6/24 21:37:00 Author:May

A 1-kHz gated oscillator with no long turn-on cycle is shown. R2, R3, and D1 preset the voltage on tuning capacitor C1 to 1/3 of the supply voltage.   (View)

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CMOS_VFO

Published:2009/6/24 21:31:00 Author:May

The circuit shown has a frequency range of 2 Hz to 30 kHz. R2 is a linear or log potentiometer.   (View)

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CRYSTAL_OSCILLATOR

Published:2009/6/24 21:28:00 Author:May

Circuit NotesStable VXO using 6-or 8-MHz crystals uses a capacitor and an inductor to achieve frequency pulling on either side of series resonance.   (View)

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SIMPLE_TTL_CRYSTAL_OSCILLATOR

Published:2009/6/24 21:25:00 Author:May

Circuit NotesThis simple and cheap crystal oscillator comprises one third of a 7404, four resistors and a crystal. The inverters are biased into their linear regions by RI to R4, and the crystal provides the feedback. Oscillation can only occur at the crystals fundamental frequency.   (View)

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VARIABLE_WIEN_BRIDGE_OSCILLATOR

Published:2009/6/24 21:15:00 Author:May

This circuit uses a single potentiometer to tune a 300- to 3000-Hz range. A FET op amp is used at A1 and A2. The upper frequency limit is determined by the gain-bandwidth product of the op amps.   (View)

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BASIC_OSCILLATOR_CIRCUITS

Published:2009/6/24 21:12:00 Author:May

Five basic types of LC oscillators are shown. The frequency can be changed by using the formula:where Leffective =equivalent inductance Ceffective =equivalent capacitance   (View)

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PRECISION_LF_OSCILLATOR

Published:2009/6/24 21:07:00 Author:May

Using R1, R7, and D1 to preset C1 to one third of the supply voltage, this circuit avoids a longer first cycle period than subsequent cycles.   (View)

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