EXACTLY !Break the beam once, LED comes on.
Break the beam again, LED goes out
repeat
Yes?
ak
I did a mistake in my circuit ,inverting transistor pins, and I corrected in the mean time, but the comments about it remained.The pins on the PNP BC327 transistor are shown correct on the schematic.
All the lights you enumerated are not used to trigger the ldr. They are just to light my room. Whatever model i use.If the light is incandescent AC, is a compact fluorescent or is a PWM dimmed LED type then it pulses and the LDR might be fast enough to trigger the Flip-flop many times.
Your experimentation is null and void. You cannot test a CD4027 by playing around with the clock input on pin-3.Playing around, I discovered something interesting about this IC.
If I take pin 3 wire, and connect it directly to +, output change state accordingly to the internal state of the IC.
If i connect the wire to - (gnd), pin 3 is switched internally. But nothing shows in the output.
So,
connect to +, output switch to ON state.
connect to -, internally switched but output remains in ON state as before.
connect to +, output switch to OFF state(as the internal mechanism dictates probably)
connect to -, internally switched but output remains in OFF state as before.
and so on.
This is a perfect contact that it does. No random stuff.
In my very old (20years) circuit I had 2 relays on the board. Now i realize that the second relay most probably was to directly ground that pin 3. Im not completly sure, since a lot of the components and wires are messed up and is very weird looking now. But it worked then! Very, very well.
A comparator can be used as a Schmitt inverter, but it's much more versatile. If you want a Schmitt inverter, use a Schmitt inverter.Now i understand that comparator and Schmitt trigger is the same thing.
For Schmitt inverter? 74*14, CD4093 (a NAND), CD40106.- My question is, what is the most common IC's ?
Your useful list will depend on the types of circuits you build. I've been designing circuits for 4 decades and I have a variety of parts on hand because I almost always order extras and in quantity to get price breaks.Can you give me your entire list of most used, all types, all categories, of IC that you have in your home?
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