IR illuminator for night-vision tv cameras and scopes

This source uses LEDs and an astable oscillator to control the switch, duty-cycle, and effective IR illumination output.

Source: http://www.circuitos.cl.tripod.com

Tanim 2012-09-07 09:48:10

I m new about electronics. . Plz tell me what is the value of 1st capacitor? Is it in pf or nf or f? ?

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+35

Admin 2012-09-07 19:02:48

C1 - 0.01uF
C2 - 47 uF

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+43

addy dan 2012-08-10 20:47:20

U1-a and U1-b?
These are NOT gates of Two types, try this circuit and any complain tell me.

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+42

mike 2012-07-06 05:45:22

what is U1-a and U1-b .? is that an IC chip.?

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+37

Dom 2015-10-12 05:21:14

Message from mike
what is U1-a and U1-b .? is that an IC chip.?

It's a single 14 pin chip a 4001 [e.g CD4001 from Fairchild]. It's a quad gate or has four cmos gates and the circuit only uses 2 of them, hence the 1/4 next to each gate.

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+18

Nijad 2011-04-28 11:59:03

very nice and useful

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+46

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