Flash-Triggered Pulse Stretcher Using Classic Monostable
Description: This is a flash-triggered (photo-driven) circuit that produces a pulse with a constant predetermined width. This circuit can be used to control any device.
The flash-triggered circuit operates by utilizing a photodetector, which is typically a photodiode or phototransistor, to sense light from a flash source. When the photodetector receives a flash of light, it generates a signal that triggers the circuit to produce a pulse. The width of this pulse is determined by the design of the circuit, often set by timing components such as resistors and capacitors in an RC timing network.
The output pulse can be used to control various devices, including relays, transistors, or other electronic components, allowing for the activation or deactivation of those devices in response to the detected flash. This capability makes the circuit suitable for applications in photography, where it can synchronize camera flashes, or in automation systems where it can respond to specific light signals.
The circuit may include additional components such as a comparator to ensure that the pulse width remains consistent under varying conditions. By adjusting the values of the resistors and capacitors, the pulse width can be fine-tuned to meet specific requirements. Furthermore, protection diodes may be included to safeguard the circuit from voltage spikes or reverse polarity, enhancing its reliability and longevity in practical applications.This is a flash triggered (photo-driven) circuit which produce a pulse with constant predetermined wide. This circuit can be used to control any device which..
The monostable period is set for approximately 1 second, which is typical for this application. The induced line hum is transmitted through capacitor C2, resulting in a continuous stream of trigger pulses. The output remains low for about 10 milliseconds...
The circuit demonstrates the functionality of the HA-5151 as a battery-powered monostable multivibrator. In this configuration, the time constant is set to 0.632, simplifying the time constant equation to T = R1 * C1. Diode D2 is employed to ensure...
U1A functions as an amplifier that drives D2 and charges C2. U1B operates as a voltage follower. R3 and R4 set the amount of stretch applied to the input pulse. C2 is capable of being charged to handle varying pulse...
This circuit is activated when switch SW1 is pressed, grounding the base of transistor Q2. The pulse rate is approximately equal to 0.7 multiplied by the product of resistor R3 and capacitor C1.
The described circuit features a transistor Q2, which...
The schematic for a monostable multivibrator is shown in figure 3-11. Like the astable multivibrator, one transistor conducts and the other cuts off when the circuit is energized. More: Recall that when the astable multivibrator was first energized, it was...
In a monostable multivibrator, one state is stable and permanent, while the other is temporary and quasi-stable. When an external trigger pulse is applied at the appropriate moment, the multivibrator transitions from the stable state to the quasi-stable state. It...
When the output is low, applying a negative-going pulse to the trigger input sets the flip-flop (Q goes low), driving the output high and turning off component 1. Capacitor C is then charged through resistor Ra until the voltage across...
This is a versatile discrete monostable circuit. The circuit consists of a 2N3819 JFET and 2N3704 transistors. This monostable multivibrator circuit has an additional input to enable or inhibit the function at any time without causing an output pulse. The...
This timer utilizes a basic monostable circuit. The duration for which the relay remains energized, referred to as the ON period, is regulated by the resistor R3 and capacitor C2. Conversely, the duration for which the relay remains de-energized, known...
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