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Index 1412

BIPOLAR_STEPPER_MOTOR_DRIVE_CIRCUIT

Published:2009/6/18 23:39:00 Author:May

BIPOLAR_STEPPER_MOTOR_DRIVE_CIRCUIT
A 4017 decade counter/divider driven from a low-frequency oscillator (U1-a and U1-b) is used to drive transistor switches to sequence the windings, as is needed. MOT1 is a 12-V stepper motor. R9 and R10 are selected for the motor's current rating. A 3.3-Hz signal from UI will cause the motor to run at 1 rpm, a 33-Hz signal will result in 10 rum, etc. (View)

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TWO_TRANSISTOR_AUDIO_AMPLIFIER

Published:2009/6/18 23:39:00 Author:May

TWO_TRANSISTOR_AUDIO_AMPLIFIER
This is a general-purpose audio ampliffier for driving a pair of stereo earphones in monaural mode.Two can be used for stereo. In this case, ground the centei top of the earphone (sleeve of J1). (View)

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10_Hz_TO_10_kHz_VCO_WITH_SQUARE_AND_TRIANGLE_WAVE_OUTPUTS

Published:2009/6/18 23:37:00 Author:May

10_Hz_TO_10_kHz_VCO_WITH_SQUARE_AND_TRIANGLE_WAVE_OUTPUTS
(View)

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NB_FM_AUDIO_AMPLIFIER

Published:2009/6/18 23:36:00 Author:May

NB_FM_AUDIO_AMPLIFIER
This audio system amplifies, limits, and filters an audio voice signal for use with an FM modulator or VCO. It has pre-emphasis of 6-dB/octave 800-3000Hz. Almost any suitable op amp can be used. (View)

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SCHMITT_TRIGGER_SINE__SQUARE_WAVE_GENERATOR

Published:2009/6/18 23:36:00 Author:May

SCHMITT_TRIGGER_SINE__SQUARE_WAVE_GENERATOR
A sine wave input can produce a square wave output by this Schmitt trigger circuit based on a 555 IC. (View)

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VARIABLE_FREQUENCY_SQUARE_WAVE_GENERATOR

Published:2009/6/18 23:35:00 Author:May

VARIABLE_FREQUENCY_SQUARE_WAVE_GENERATOR

This simple square-wave generator produces a variable frequency output of 2800 Hz to 80 kHz with the values shown. Frequency is adjusted with potentiometer R1. (View)

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MICROPOWER_LINEAR_AMPLIFIER

Published:2009/6/18 23:34:00 Author:May

MICROPOWER_LINEAR_AMPLIFIER
This circuit, based on the inverter in the CD4007UB CMOS linear amplifier, shows a method for reducing drain current. (View)

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VACUUM_TUBE_AUDIO_AMPLIFIER

Published:2009/6/18 23:33:00 Author:May

VACUUM_TUBE_AUDIO_AMPLIFIER
This schematic is for a tubehead amplifier. The output from transformer T1 is positive half-wave ac rectified by Dl and filtered by C1, C2, and RI for a +15-V supply. A -15-V supply is avail-able from D2, C3, C4, and R3. The plate supply for the 12AX7 tubes is produced by a voltage multi-plier.Some listeners prefer the sound of a vacuum tube audio system. Although this is rather subjective and a personal preference, this circuit can be used to simulate the tube sound preferred by these listeners. (View)

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60_Hz_SQUARE_WAVE_GENERATOR

Published:2009/6/18 23:30:00 Author:May

60_Hz_SQUARE_WAVE_GENERATOR
This generator circuit uses an overdriven amplifier to produce a 60-Hz square wave from the 60-Hz ac line. The circuit can be used in lineoperated applications as a clock source. (View)