Camera Circuits

Flash-meter

Insulated-gate, field-effect transistor (IGFET), Q2 and silicon photo cell Zl form the heart of this circuit. Transformer T1 is an audio-output type, but it"s reversed in the circuit. A sudden flash from a photoflash unit detected by Zl sends a voltage pulse through the low-impedance winding of Tl via Rl. That voltage pulse is stepped-up in Tl"s 500-!l, primary winding before being rectified...
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...
Sound light-flash trigger

Sound input to the microphone triggers the IC monostable circuit which subsequently triggers an SCR, and hence the flash, after a time delay
Xenon-flash-trigger

This circuit is used for remote photographic flash units that flash at the~ame time as the flash attached to the camera. This circuit is designed to the trigger cord or hot shoe connection of a commercial portable flash unit and triggers the unit from the light produced by the light of the flash unit attached to the camera. This provides remoteoperation without the need for wires or cables...
Photo Strobe Circuit

Sound or light sensors corniected to J2 produce a voltage that is amplified by ICl-a and ICl-b. A positive trigger voltage that is developed by D1 and 1)3 and amplified by ICl-d, drives 1C2 and 1C1 to trigger SCR1. SCR1 is connected to a strobe.
Darkroom Timer Circuit

The electronic darkroom timer is built around a 555 oscillator/timer, a pair of general-purpose transistors, a buzzer, and an LED. The 555 (Ul) is configured as an astable multivibrator (free-running oscillator). The frequency of the oscillator is determined by the values through i3 and Cl through C4. Switch SI is used to divide the capacitor network to vary the time interval between beeps;...
Enlarging Light Meter Circuit

Meter Ml, a +/-50-uA zero-center D`Arsonval meter movement is driven by Ul, a TL081 FET op amp, through R3. The gain of Ul is set at 11 by Rl and R2, while capacitor 01 is used to restrict the bandwidth of Ul to 1.6 Hz. Power for the circuit is derived from a simple dual-polarity 12- V power supply (consisting of Tl, D3, D4, 02, and 03). A light-dependent resistor (LDR), R16 (which is a...
Time-Delay Photo-Flash Trigger

Ql is a phototransistor that is normally illuminated by a beam of light. When the beam is intercoupled, pin
Enlarger Exposure Meter Circuit

Two gates of a 4011 arc used as a comparator. When the resistance of R4 decreases the voltage at pin 1 and 2 increases, producing a logic zero at pin 3, causing pin 4 to go high and activating the LED. R3 is calibrated in light units, or seconds exposure time. To calibrate, set pot R3 so as to just be on the LED ON/OFF threshold. With a light level that is suitable to correctly expose a...
Camera-alarm-trigger

Transistor Ql remains off until the magnetic switch connected to Jl closes. When that happens, the 9 Vis connected through Rl to Ql"S base. Ql turns on, thereby charging C2 through relay Kl, which causes Kl "s contacts to close. Since the contacts connect viaJ2 to the remote control jack in the camera, which in tum connects to the camera"s shutter release, the closure of Kl"s contacts will...
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
Slide Projector Auto Advance

A 4001 CMOS Quad NORgate is set up as an astable multivibrator, which drives a simple differentiator and relay
Photo Flash Slave Unit Circuit

Phototransistor Ql receives a light pulse from a photoflash unit. The pulse is ac-coupled to amplifier Q2. It then triggers SCR1,
Analog Voltage Camera-Image Tracker

By using a low-cost RS-170 camera and this circuit, a voltage that trades the position of an object in
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
Contrast meter

One leg of the photocell (Rl) is tied to the +15 volt supply and the other end is connected to ground through resistor R2, forming a voltage-divider network. The non-inverting input of the 741 op amp, IC1, is tied to the junction formed by Rl and R2, while its inverting input is grounded through resistor R3. When switch SI is pressed, another divider network is formed, reducing the voltage...
Photo Strobe Slave Trigger Circuit

The photo strobe slave trigger circuit uses a solar cell and an SCR to flash any strobe when you trigger your master strobe.
Darkroom-enlarger-timer

The NE555 circuit is a basic one-shot timer with a relay connected between the output and ground. It is triggered with the normally open momentary contact switch, which when operated, grounds the trigger input at pin 2. This causes a high output to energize Kl which closes the normally open contacts in the lamp circuit. They remain closed during the timing interval, then open at time out....
Slide-timer

This circuit will record commentary and/ or music on one track of a tape and put the beeps that change the slides on another track. Gate U2a is used to trigger U1, which is configured as a timer when a pulse is received from either the tape input or via pushbutton switch Sl. Timer U2 outputs one pulse for every input pulse received, no matter how long S1 is depressed. The Q output of U2 at...
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 (Si) is used to select a resolution of or 1 seconds and to simultaneously move the decimal point
Kirlian Photography power supply

CD4049 IC multivibrator circuit drives a Darlington connected transistor pair, which drives TR2, a transformer.
Photo-Event Timer

S2 is used to initiate timing. A light-to-dark or dark-to-light transition stops this timer, depending on the setting of
Electronic-photoflash

Using the CA3164A BiMOS control chip consumes less than 15 pA during standby, yet it can provide 100 mA of chopped current to the de-to-de converter during the energy-reservoir charging cycle. The CA3164A drives tbe primary of T1 with symmetrically chopped current at a 400 to 2000 Hz rate. The CA3164Ns chopper frequency is about 500Hz;
Wien-Bridge Oscillator

The HA2541 is well-suited for use as the heart of an oscillator. In spite of the rudimentary diode limiting that is
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....
Camera Trip Circuit

This circuit was used to trip a camera shutter. Grounding pin 2 of U1 makes pin 4 of U1 go high. This triggers both tim
Tlash exposure meter

Strobe light meter catches the peak of flash intensity and holds it long enough to give a reading
Remote flash trigger

Transistor Ql is a light-activated silicon-controlled rectifier (LASCR). The gate is tripped by light entering a small iens built into the top cap. To operate, provide a 6-in. length of stiff wire for the anode andcathodeconnections 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...
Flash slave driver

In photography r 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 Rl

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