Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
alec_t thanks for your circuit.
will try in next holidays. maybe i need to change u2, because
not popular in my country. search dsheet u2 first.
i like your circuit with 4.8-5.5v.
really need this because my area often lights off.
I try to answer from the last exp,
Basic circuit like above
R10 change to 1K
VR change to VR1K As potensio, the 3rd leg to ground
LDR when light on in house - 10K
LDR when black shade by finger close - 90K
Trans BC547.
Battery 5.5v 2000mah rechargable in full.
The circuit run perfectly with...
I will try to expriment again. But I have only lm741. hope not many different with 393.
My goal actually, long life battery when light about 3 months (when the led off). So the led still
can on when dark about 1 hour. So we can switch to another standard emergency lamp.
I dont satisfied...
I ever tried the circuit like above with no luck, except
the vr change to potensio. and change the resistor value.
if not, the led continues on, or continues off.
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