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Seismo-Quake® Monostable Timer
267 x 180 x 80 millimeters (10.68 x 7.2 x 3.2 inches)
175 grams (6.17 ounces)
|What is the Seismo-Quake® Monostable Timer ?|
The monostable timer was developed out of the need for a cost effective tutorship solution in electronics pertaining to, the 555 timer integrated circuit and to seamlessly interface external circuitry to the monostable timer circuit. Apply electrical power to the circuit, provide a pulse on the trigger input of the timer circuit and switch an external device on, for example a buzzer, for a predetermined time ! The time period that the external device for example a buzzer is sounding, is determined by the formula t = 1.1 x R x C for a Bipolar 555 timer ingtegrated circuit. R is resistance in the form of a potentiometer and C is capacitance in the form of a capacitor. A pulse on the reset input of the timer circuit will stop the external device for example a buzzer sounding, if the time period has not yet expired. Both inputs of the timer circuit, trigger and reset may be controlled manually.
Seismo-Quake® Monostable Timer consist of a pre-assembled printed circuit board (PCB) with a 555 timer integrated circuit as the main electronic component. An onboard pulse differentiator assist with pulses at the trigger input of the timer circuit. A safe maximum supply voltage for both CMOS and Bipolar are 16VDC. The output current of a CMOS 555 timer integrated circuit may sink or source 100mA and may connect to a TTL or CMOS device and the output current of a Bipolar 555 timer integrated circuit may sink or source 200mA. An onboard output transistor greatly increase current handling capability.
|Key Features - Technical|
Electrically safe to use with no alternating current (AC) mains connection.
Power source is a 9 Volt (or PP3) battery (not included).
Input and output reverse polarity protection build in.
No voltage regulation applied.
Safe maximum supply voltage of 16VDC.
Functional operating ambient temperature 0ºC to +70ºC.
555 timer integrated circuit operating ambient temperature 0ºC to +70ºC.
Use in process control.
Use in robotics
Switching an external device on for a predetermined time and off again.
Where a low power device is required.
Valuable knowledge for education in electronics. Include a 555 timer integrated circuit in monostable configuration, light emitting diodes (LEDs) as visual output indicators, input pulse differentiator and output transistors.
Provide additional expansion for hobby model enthusiasts.
Seismo-Quake® Monostable Timer integrate with the Seismo-Quake® Burglar Alarm.
Assembling the Seismo-Quake® Monostable Timer kit, connect the 9 Volt (PP3) battery clip to the connector on the printed circuit board (PCB) marked DC IN. Remember to note the polarity. The red colour coded wire connect to +V and the black colour coded wire connect to GND. Calculate the time period with the formula t = 1.1RC for a Bipolar 555 timer integrated circuit and provide a pulse on the trigger input of the timer circuit. Congratulations, the Seismo-Quake® Monostable Timer may now switch an external device on for a predetermined time and off again !
|Hints and Tips|
For a more economical approach use NiMH rechargeable batteries.
The last time this page was modified, was: 9:54 pm, 16 Jul 2018
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