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Index 1280

EXTENDED_RANGE_VU_METER（DOT_MODE）

Published:2009/6/28 21:05:00 Author:May

EXTENDED_RANGE_VU_METER（DOT_MODE）
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PHOTOGRAPHIC_TIMER

Published:2009/6/28 21:04:00 Author:May

PHOTOGRAPHIC_TIMER
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SHUTTER_TESTER
Shutter speed tester combines frequency counter, crystal oscillator, and photo-transistor-operated gate generator. Oscillator pulses are counted as long as the shutter is open. Reset is automatic at the instant the shutter opens. (View)

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FLASH_EXPOSURE_METER

Published:2009/6/28 21:02:00 Author:May

FLASH_EXPOSURE_METER
Strobe light meter catches the peak of flash intensity and holds it long enough to give a reading. The reset button must be pressed before each measurement. (View)

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REMOTE_FLASH_TRIGGER

Published:2009/6/28 21:01:00 Author:May

REMOTE_FLASH_TRIGGER
Transistor Q1 is a light-activated silicon-controlled rectifier (LASCR). The gate is tripped by light entering a small lens built into the top cap. To operate, provide a 6-in. length of stiff wire for the anode and cathode connections and terminate the wires in a polarized power plug that matches the sync terminals on your electronic flashgun (strobelight). Make certain the anode lead connects to the positive sync terminal. When using the device, bend the connecting wires so the LASCR lens faces the main flash. This will fire the remote unit. (View)

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FLASH_SLAVE_DRIVER

Published:2009/6/28 20:58:00 Author:May

FLASH_SLAVE_DRIVER
In photography, a separate flash, triggered by the light of a master flash light, is often required to provide more light, fill-in shadows etc. The sensitivity of this circuit depends on the proximity of the master flash and the value of R1. Increasing R1 gives increased sensitivity. (View)

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SOUND_ACTIVATED_STROBE_TRIP

Published:2009/6/28 20:57:00 Author:May

SOUND_ACTIVATED_STROBE_TRIP
Take strobe-flash pictures the instant a pin pricks a balloon, a hammer breaks a lamp bulb or a bullet leaves a gun. Use a transistor amplifier of 1-watt rating or less. (It must have an output transformer.) The amplifier is terminated with a resistor on its highest output impedance, preferably 16 ohms. To test, darken room lights, open camera shutter, and break a lamp bulb with a hammer. The sound of the hammer striking the lamp will trigger the flash, and the picture will have been taken at that instant. (View)

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SOUND_LIGHT_FLASH_TRIGGER

Published:2009/6/28 20:55:00 Author:May

SOUND_LIGHT_FLASH_TRIGGER
Sound input to the microphone triggers tthe IC monostable circuit which subsequently triggers an SCR, and hence the flash, after a time delay. This delay is adjustable—by varying the monostable on-time—from from 5 milliseconds to 200 milliseconds. (View)

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60_MHz_POWER_GAIN_TEST_CIRCUIT

Published:2009/6/28 21:09:00 Author:Jessie

60_MHz_POWER_GAIN_TEST_CIRCUIT
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PHOTO_STOP_ACTION

Published:2009/6/28 20:52:00 Author:May

PHOTO_STOP_ACTION
This circuit gives multiple stop-action photographic effects like showing a bouncing ball in up to nine locations in a single photograph. The circuit will automatically fire the bulbs sequentially with the time between each firing variable. The circuit is functionally complete except for the actual firing system. In many cases, a simple SCR will work, as shown. The firing can be initiated in one of two ways. A trigger pulse can be applied to the trigger input terminal through a capacitor, or can operate the unit as a slave. Light from a camera-mounted flash will activate the circuit through its built-in photocell pickup. The time period between each successive flash is determined by C1 and R1, which is variable. Afterfiring the circuit, it must be reset by momentarily depressing the reset button. (View)

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POWER_METER（1_kW_FULL_SCALE）

Published:2009/6/28 21:09:00 Author:Jessie

POWER_METER（1_kW_FULL_SCALE）
The circuit is intended for 117 Vac ±50 Vac operation, but can be easily modified for higher or lower voltages. It measures true (nonreactive) power be ing delivered to the load and requires no external power supply. Idling power drain is only 0.5 W. Load current sensing voltage is only 10 mV, keeping load voltage loss to 0.01%. Rejection of reactive load currents is better than 100:1 for linear loads. Nonlinearity is about 1% full scale when using a 50 μA meter movement. (View)

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DARKROOM_TIMER

Published:2009/6/28 20:50:00 Author:May

DARKROOM_TIMER
The darkroom timer/controller uses few external components: a display, a digit driver, keyboard, and output switching devices. A 4-digit common-cathode LED display is desirable for dark room environments. The time base is provided by shaping up the 50/60 Hz ac line. A DPDT switch (S1) is used to select a resolution of .1 or 1 seconds and to simultaneously move the decimal point. Timer/ controller has two switched ac outlets, one for the enlarger and one for the safe light. They are the complements of each other in that the safe light is on when the enlarger is not active and is off when the enlarger is printing. The buzzer is of the self-contained oscillator variety and operates with dc drive. (View)

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AUTOMATIC_CONTRAST_METER

Published:2009/6/28 20:48:00 Author:May

AUTOMATIC_CONTRAST_METER
The circuit arrangement consists of a photo-amplifier which feeds a voltage derived from varying light levels in an enlarger to a pair of peak detectors. One follows the peak positive voltage and the other the peak negative voltage. The capacitors used for storing the voltage peaks in the followers also form part of sample and hold circuits which are then switched to hold after the measurement. Their outputs represent the maximum and minimum values of light intensity. A differential amplifier then computes the ratio of these values, and the result is displayed on an LED bargraph meter. (View)

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1AUDIO_POWER_METER

Published:2009/6/28 21:07:00 Author:Jessie

1AUDIO_POWER_METER
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0°TO_360°PHASE_SHIFTER

Published:2009/6/28 20:45:00 Author:May

0°TO_360°PHASE_SHIFTER
Each stage provides 0°to 180°phase shift. By ganging the two stages，0°to 360°phase shift is achieved．The 2N3070 JFETs do not load the phase shift networks． (View)

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SOLID_STATE_AUTO_REGULATOR

Published:2009/6/28 21:06:00 Author:Jessie

SOLID_STATE_AUTO_REGULATOR
Replaces and outperforms electromechanical charging-voltage regulator in autos using altemator systems. Prolongs battery life by preventing un dercharging or overcharging of 12-V lead-acid battery. Uses LM723 connected as sia;itching regulatorfor controlling altematorfield cument. R2 is adjusted to maintain 13.8.V fully charged voltage for standard auto battery. Article gives construction details and tells how to use external relay to maintain altemator charge-indica-torfunction in cars having idiot light ratherthan charge-discharge ammeter. Q1 is 2N2063A (SK3009) 10-A PNP transistor.-W. J. Prudhomme, Build Your Own Car Regulator, 73 Magazine, March 1977, p 160-162. (View)