Circuit Diagram

Low_distortion_oscillator

Published:2009/7/24 9:01:00 Author:Jessie

The 2N4416 JFET is capable of oscillating in a circuit, where harmonic distortion is very low. The JFET oscillator is excellent when a low harmonic content is required for a good mixer circuit. The values given are for a 20-MHz oscillator. National Semiconductor, Linear Applications Handbook, 1991, p. 114.   (View)

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Stable_low_frequency_crystal_oscillator

Published:2009/7/24 9:00:00 Author:Jessie

This Colpitts crystal oscillator is ideal for low-frequency oscillator applications. Excellent stability is assured because the 2N3823 JFET circuit loading does not vary with temperature. National Semiconductor, Linear Applications Handbook, 1991, p. 114.   (View)

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LOW_POWER_BINARY_TO_10SUPn_SUP_GAIN_LOW_FREQUENCY_AMPLIFIER

Published:2009/7/1 1:55:00 Author:May

Gain increases by decades as the binary input decreases from 1,1 to 0,0. Minimum gain is 1 and maximum gain is 1000, Since the switch is static in this type of amplifier the power dissipation of the switch will be less than a tenth of a milliwatt.   (View)

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JFET_Pierce_crystal_oscillator

Published:2009/7/24 8:59:00 Author:Jessie

This circuit allows a wide frequency range of crystals to be used without circuit modification. Because the JFET gate does not load the crystal, good Q is maintained, which thus ensures good frequency stability. National Semiconductor, Linear Applications Handbook, 1991, p. 106.   (View)

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LOW_POWER_INVERTING_AMPLIFIER_WITH_DIGITALLY_SELECTABLE_GAIN

Published:2009/7/1 1:55:00 Author:May

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Temperature_compensated_crystal_oscillator

Published:2009/7/24 8:27:00 Author:Jessie

This circuit uses an LTC1043 to differentiate between a temperature-sensing network and a dc reference. The singla-ended output biases a varactortuned crystal oscillator to compensate drift. The varactor-crystal network has high dc impedance, with eliminates the need for an output amplifier from the LTC1043. Connect other LTC1043 pins as follows: 4 to +5 V, 16 to ground through a 0.001-μF capacitor, and 17 directly to ground. Linear Technology, Linear Applications Handbook, 1990, p. AN3-15.   (View)

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PHOTODIODE_CURRENT_TO_VOLTAGE_CONVERTER

Published:2009/7/1 1:53:00 Author:May

The circuit uses three CA3130 BiMOS op amps in an application sensitive to sub-picoampere input currents. The circuit provides a ground-referenced output voltage proportional to input current flowing through the photodiode.   (View)

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Basic_positive_buck_converter

Published:2009/7/24 8:26:00 Author:Jessie

This circuit is used to convert a larger positive input voltage to a lower positive output, using an LT1074 switching regulator. Typical waveforms are shown in Fig. 4-39B. These waveforms are based on a VIN of 20 V, VOUT of 5 V, and L of 50μH for both continuous mode (inductor current never drops to zero) with IOUT of 3A, and discontinuous mode (inductor current drops to zero during a potion of the switching cycle (IOUT =0.17 A).   (View)

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THERMALLY_STABILIZED_PPIN_PHOTODIODE_SIGNAL_CONDITIONER

Published:2009/7/1 1:50:00 Author:May

The photodiode specified responds linearly to light intensity over a 100 dB range.Digitizing the diodes linearly amplified output would require an A-D converter with 17 bits of range. This requirement can be eliminated by logarithmically compressing the diode's output in the signal conditioning circuity. Al and Q4 convert the diode's photocurrent to voltage output with a logarithmic transfer function. A2 provides offsetting and additional gain. A3 and its associated components form a temperature control loop which maintains Q4 at constant temperature (all transistors in this circuit are part of a CA3096 monolithic array). The 0.033μF value at A3's compensation pins gives good loop damping if the circuit is built using the array's transistors in the location shown. Because of the array de's small size, response is quick and clean. A full-scale step requires only 250 ms to settle to final value. To use this circuit, first set the thermal control loop.To do this, ground Q3's base and set the 2 k pot so A3's negative input voltage is 55 mV above its positive input. This places the servo's setpoint at about 50℃(25℃ ambient + (2.2 mV/℃, x 25℃ rise = 55 mV = 50℃). Unground Q3's base and the array will come to temperature. Next, place the photodiode in a completely dark environment and adjust the dark trim so A2's output is 0 V. Finally, apply or electrically simulate 1 mW of light and set the full-scale trim for 10 V out. Once adjusted, this circuit responds logarithmically to light inputs from 10nW to 1mW with an accuracy limited by the diode's 1% error.   (View)

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HIGH_IMPEDANCE_LOW_CAPACITANCE_AMPLIFIER

Published:2009/7/1 1:50:00 Author:May

This compound series-feedback circuit provides high input impedance and stable，wide-band galn for general purpose video amplifier applications．   (View)

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FET_CASCODE_VIDEO_AMPLIFIER

Published:2009/7/1 1:49:00 Author:May

The FET cascode video amplifier features very low input loading and reduction of feed-back to almost zero. The 2N5485 is used be-cause of its low capacitance and high Yfs. Bandwidth of this amplifier is limited by R1, and load capacitance.   (View)

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MONOSTABLE_PHOTOCELL_CIRCUIT_HAS_SELF_ADJUSTING_TRIGGER_LEVEL

Published:2009/7/1 1:49:00 Author:May

A photocell circuit provides automatic threshold adjustment. Monostable actionprevents undesired retriggering of the output. With only one op amp IC，the circuit offers：Automatic adjustment of its trigger level to accommodate vanous light Sources，changesh ambient light and misalignments；A built-in monostable action to provide only a singleoutput pulse during a preset time；Feedback action toralse the threshold level aftertriggering and to speed switching．The feedback also eliminates the circuit's tendencyto oscillate during switching   (View)

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PRECISION_PEAK_TO_PEAK_AC_DC_CONVERTER

Published:2009/7/1 1:48:00 Author:May

Using a CA3140 BiMOS op amp and a single positive supply converts a conventional voltage doubler with two precision diodes into a precision peak-to-peak ac-to-dc voltage converter having wide dynamic range and wide bandwidth.   (View)

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MINIMUM_POWER_FLASHER（15_V）

Published:2009/7/1 1:48:00 Author:May

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EMERGENCY_LANTERN／FLASHER_

Published:2009/7/1 1:47:00 Author:May

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HIGH_EFFICIENCY__PARALLEL_CIRCUIT_FLASHER_

Published:2009/7/1 1:46:00 Author:May

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FREQUENCY_DIVIDER

Published:2009/7/1 1:46:00 Author:May

If the input frequency is known, the timer can easily be used as a frequency divider by adjusting the length of the timeing cycle. Figure shows the waveforms of the timer when used as a divide-by-three circuit. This application makes use of the fact that this circuit cannot be retriggered during the timing cycle.   (View)

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VARIABLE_FLASHER_

Published:2009/7/1 1:46:00 Author:May

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MODULATED_LIGHT_BEAM_CIRCUIT_CANCELS_AMBIENT_LIGHT_EFFECTS

Published:2009/7/1 1:46:00 Author:May

Feedback control of the phototransistor in this optical detector helps negate the effects of varying ambient light sources. The output of a modulated visible-light LED is detected, amplified, buffered, and fed through a low-pass ftlter. Ambient light signals below the LED's 10-kHz modulating rate reach the detector's base out of phase with incoming ambient light and cancel the undesired effects.   (View)

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ALTERNATING_FLASHER

Published:2009/7/1 1:44:00 Author:May

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