Photo stop action

Description: This circuit provides multiple "stop-action" photographic effects, such as capturing a bouncing ball in up to nine different positions within a single photograph. The circuit is designed to automatically activate the bulbs sequentially, with a variable time interval between each activation. It is functionally complete, with the exception of the actual firing mechanism. In many instances, a simple Silicon Controlled Rectifier (SCR) can be utilized, as illustrated. The firing process can be initiated in one of two ways: a trigger pulse can be applied to the trigger input terminal via a capacitor, or the unit can function as a slave device. Illumination from a camera-mounted flash will trigger the circuit through its integrated photocell pickup. The interval between each successive flash is determined by capacitor C1 and resistor R1, which are adjustable. After each activation, the circuit must be reset by briefly pressing the reset button.

This circuit is designed to facilitate advanced photographic techniques by enabling the capture of multiple images in rapid succession, effectively freezing motion for analysis or artistic effect. The sequential firing of bulbs is critical for achieving the desired stop-action effect. The use of an SCR as the firing mechanism allows for efficient control over the high current required to activate the bulbs, ensuring reliable operation.

The trigger input terminal serves as the primary control point, where an external trigger pulse can be introduced. This allows for flexibility in operation; when a capacitor is connected, it filters the pulse to ensure smooth activation. Alternatively, integrating a photocell pickup enables the circuit to respond to external light sources, such as a flash from a camera. This feature is particularly useful in dynamic shooting environments where the timing of the flash is crucial.

The timing of the bulb activations is adjustable, thanks to the combination of capacitor C1 and resistor R1. By varying these components, the user can modify the duration between each flash, allowing for tailored photographic effects. This adjustability is essential for different scenarios, such as capturing fast-moving objects or creating specific visual effects.

The reset mechanism is straightforward; a momentary press of the reset button clears the circuit's previous state, preparing it for the next series of activations. This ensures that the user can quickly and efficiently prepare the circuit for subsequent shots without significant downtime.

In summary, this circuit represents a versatile tool for photographers seeking to explore motion capture techniques. Its design incorporates essential features for flexibility, reliability, and ease of use, making it suitable for both amateur and professional applications in the realm of stop-action photography.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 Cl and Rl, which is variable. After firing the circuit, it must be reset by momentarily depressing the reset button.