Hi All
I'm entirely new to electronics and the last time I covered any theory on electricity was more than 10yrs ago, so please excuse my lack of knowledge.
My Problem:
I fly RC Helicopters and would like to create a remote glow plug ignition system. To elaborate, a glow plug is simply a heating element that, with the aid of a starter motor, starts the helis engine. Glow plug can usually be heated using a 1.25 -1.5V 1700mAh battery that is attached to the engine and then removed once started. I would prefer to have an on board ignition system that can be activated by a tactile switch.
The system would make use of the 555 timer IC on a 10 sec timer i.e. the glow plug should be heated for 10 secs and then switches of until the switch is pressed again. From my research (taken from the nomograph monostable operation section of the datasheet) a 10M resistor and 1.2uF capacitor should give me a 10 sec high output. The entire system would be powered by a 7.4V 2200mAh lipo via a voltage regulator set to 5.2V (10A const, 20A peak). The datasheet also indicates that the trigger voltage must be lower than 1/3 of the input voltage.
I plan to design the circuit as illustrated in the monostable section of the http://english.cxem.net/beginner/beginner1.php website.
Questions:
1. Have I got the correct resistor and capacitor values for the 10 sec timing? - don't worry about this question the design website provides the values for the resistor and capacity for 10 sec (100K and 100uF).
2. How do I get the trigger voltage to be less that 1/3 the input, or would the timer resistor do this anyway?
3. Is the layout in the pic incorrect for my problem and if so how can I modify it for my use?
4. What can I use to boost the output current (power transistor - maybe?) and drop the voltage to 1.25 - 1.5V (resistor/regulator)?
I'd appreciate any help.
Thanks,
Deanen
I'm entirely new to electronics and the last time I covered any theory on electricity was more than 10yrs ago, so please excuse my lack of knowledge.
My Problem:
I fly RC Helicopters and would like to create a remote glow plug ignition system. To elaborate, a glow plug is simply a heating element that, with the aid of a starter motor, starts the helis engine. Glow plug can usually be heated using a 1.25 -1.5V 1700mAh battery that is attached to the engine and then removed once started. I would prefer to have an on board ignition system that can be activated by a tactile switch.
The system would make use of the 555 timer IC on a 10 sec timer i.e. the glow plug should be heated for 10 secs and then switches of until the switch is pressed again. From my research (taken from the nomograph monostable operation section of the datasheet) a 10M resistor and 1.2uF capacitor should give me a 10 sec high output. The entire system would be powered by a 7.4V 2200mAh lipo via a voltage regulator set to 5.2V (10A const, 20A peak). The datasheet also indicates that the trigger voltage must be lower than 1/3 of the input voltage.
I plan to design the circuit as illustrated in the monostable section of the http://english.cxem.net/beginner/beginner1.php website.
Questions:
1. Have I got the correct resistor and capacitor values for the 10 sec timing? - don't worry about this question the design website provides the values for the resistor and capacity for 10 sec (100K and 100uF).
2. How do I get the trigger voltage to be less that 1/3 the input, or would the timer resistor do this anyway?
3. Is the layout in the pic incorrect for my problem and if so how can I modify it for my use?
4. What can I use to boost the output current (power transistor - maybe?) and drop the voltage to 1.25 - 1.5V (resistor/regulator)?
I'd appreciate any help.
Thanks,
Deanen
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