Comments on: Super bright LED night light

By: suleman

suleman — Tue, 01 Nov 2011 05:36:50 +0000

Good One

By: Simon B

Simon B — Mon, 01 Aug 2011 14:53:10 +0000

A large hammer to the head normally stops them playing music.

By: ravi

ravi — Sun, 31 Jul 2011 03:02:16 +0000

Hi good morning sir.daily am travelling in train approx 150km.in this train the people will play music player in china mobiles with lot of sound.this is too much irritating to co passengers.if you have any ckt to jam this player please send to my email.thanks.

By: rohit kumar

rohit kumar — Tue, 17 May 2011 03:39:17 +0000

Thanks Seetharaman for the Technical Know how !!

By: Seetharaman

Seetharaman — Sun, 15 May 2011 18:10:30 +0000

You can use 30 LEDs replace D2 with 3 X 36 volt 1/2 watt zener diodes in series to achieve 108 volts. 35mA will be DC current through the LEDs. The DC voltage across the bridge rectifier will be 1.3 volts. the drop across R2 will be 0.2volt. Normal thumb rule for filter capacitor for 100Hz(full wave rectifier) ripple is 1000uF per amp load for acceptable level ripple. you can calculate for 35mA. The drop across R3 will be voltage across D2 – 2.5 volts. Drop across C1 will have both AC and DC components. Measurement will be difficult without proper expensive multimeter.

By: rohit kumar

rohit kumar — Sat, 14 May 2011 04:53:09 +0000

Hello Seetharaman,

I have some questions regarding the circuit?
If 30 leds are used in this circuit.

-what is the voltage drop across C1.
-What is the voltage across the bridge rectifier.
-what is the Current in the circuit (mA)
-What is the voltage drop across the resistor R2 & R3
-How do we calculate C2 for ripple free.

By: rohit kumar

rohit kumar — Sat, 14 May 2011 04:31:18 +0000

Hello Seetharaman,

If 30 leds are used in the circuit, what would the power conusumption be ?

By: Seetharaman

Seetharaman — Sat, 23 Apr 2011 11:23:07 +0000

Hi Abiola You can try IRF540.
Hi Janong you have to replace D2 from 39 volts to 120 volt zener. C2 should be rated for 250 volts.
Hi Prashanth this will hardy consume any current during day time.
Also go through my comments on oct 16th
For 230 Volt operation reduce C1 0.33uF 400 volt no other change is required

By: Raji abiola

Raji abiola — Thu, 21 Apr 2011 17:04:00 +0000

Pls what is the equivalent of zvn2106, i cant get it

By: janong

janong — Tue, 08 Feb 2011 02:01:26 +0000

1. how can i improve the no. of led that will be connected in series with the circuit ,
2 does making 30 led’s as a load vary their brightness?? is there a revision in the circuit that was presented here so that it can handle the 30 led’s