smartmachine
- May 14, 2013
- 1
- Joined
- May 14, 2013
- Messages
- 1
Hi!........
I saw a circuit on the instructables.com website, which described a simple circuit of how to connect a LED on AC Mains, on the following link:
http://www.instructables.com/id/LED-on-AC-Mains/
The circuit consisted of a Diode (1N4007), a resistance (resistor) of 1 watt rating of value anywhere from 20 kilo ohms up to 100 kilo ohms, and of course an LED (5mm or 10 mm of any colour). The circuit was assembled in such a way that, the Diode (1N4007) was connected with its black anode to the Cathode of the LED and the resistor was connected on the anode side of the LED.
I built this circuit with using Bridge rectifier (combining four 1N4007 diodes) and it is working fine. The problem (and my Question of course) is this that, the resistor in this circuit ALWAYS gets VERY HOT! I first used the resistor of 1 Watt rating of value 22K ohms, then used 27K ohms in place with 2 Watt rating, and now used 10K ohms of 5 Watt rating, the problem remains the same! The circuit still works, but the same resistance gets sooo hot (but never burns out, in all above cases and in this 5 Watt case of the resistor also, I've noted it for a very long time connecting the circuit with AC Mains) that u can't even pick it up with your two fingers to sense the temperature of the resistor! WHY IS THIS SO??..... and How to overcome this problem?
Plz provide help in this context for which I'll be grateful.
I saw a circuit on the instructables.com website, which described a simple circuit of how to connect a LED on AC Mains, on the following link:
http://www.instructables.com/id/LED-on-AC-Mains/
The circuit consisted of a Diode (1N4007), a resistance (resistor) of 1 watt rating of value anywhere from 20 kilo ohms up to 100 kilo ohms, and of course an LED (5mm or 10 mm of any colour). The circuit was assembled in such a way that, the Diode (1N4007) was connected with its black anode to the Cathode of the LED and the resistor was connected on the anode side of the LED.
I built this circuit with using Bridge rectifier (combining four 1N4007 diodes) and it is working fine. The problem (and my Question of course) is this that, the resistor in this circuit ALWAYS gets VERY HOT! I first used the resistor of 1 Watt rating of value 22K ohms, then used 27K ohms in place with 2 Watt rating, and now used 10K ohms of 5 Watt rating, the problem remains the same! The circuit still works, but the same resistance gets sooo hot (but never burns out, in all above cases and in this 5 Watt case of the resistor also, I've noted it for a very long time connecting the circuit with AC Mains) that u can't even pick it up with your two fingers to sense the temperature of the resistor! WHY IS THIS SO??..... and How to overcome this problem?
Plz provide help in this context for which I'll be grateful.
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