Here is a simple and powerful LED circuit that can be operated directly from the AC 100 volt to AC 230 Volts mains supply. The circuit can be used as mains power locator or night lamp etc.. The resistor R1,R2 and capacitor C1 provides necessary current limiting. The circuit is sufficiently immune against voltage spikes and surges.
Circuit's pictures:
Circuit diagram:
Parts:
D1 = 1N4007
D2 = 1N4007
D3 = 1N4007
D4 = 1N4007
R2 = 1M-1/2W
R1 = 470R-1/2W
C1 = 220nF-275vAC
D5 = 5mm. Blue LED
Features:
- Small in size!
- Blue LED operated on mains voltage
- Suited for mains indicator or other pilot lamps
- For safety guidance, stairs, corridors…
- Special X2 safety capacitor
- 100Vac to 240Vac 50Hz or 60Hz Operated
- Dimensions: 28x18mm / 1.10 x 0.71"
Note:
- Only for use inside a cabinet
- The capacitor C1 can be polyester type.
- Also white LED can be used in this circuit.
- Assemble the circuit on a general purpose PCB.
Safety and Hazard WARNINGS:
This circuit operates on a lethal power voltage. Mount the circuit in a protective cabinet prio to applying AC Power. Do not modify the circuit - Wait 10 minutes before touching the circuit after disconnecting the AC Power. This circuit is not intended for children.
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4 comments:
Very impressive work.
The pic for 220VAC application shows:
A 0.1uF x 275V cap.
Your BOM shows a 220 nF x 275V cap.
IE about twice the capacity.
Is the BOM applicable to 110 VAC systems.
Can you please clarify which caps & resistors apply in each case
@peterlonz
You can use 100nf-220nf/275V Cap.
use a cap with rated for atleast 400V when using this circuit on 240v AC, or else u blow ur setup when a voltage spike occurs. Add a 47uF 100V cap parallel to the led to reduce flicker as well as a 3.6V 1/2W zenner to increase the life of the led. Rest all is good.
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