siily question re mc14069ubcp

[njkmonty]

is mc14069ubcp  interchangeable for a cd4069?

i was looking at using it here... as I dont seem to have any cd4069's lying around

[slacker]

Yes, the mc1 part is just Motorola/Onsemi/Freescale's own prefix.

[njkmonty]

cool thanks for that!

[drummer4gc]

Should that be +5v in instead of +9v? I've seen a few of these layouts that specify 9v for a 5v relay...typo, or am I missing something?

[PRR]

"Most" small relays will stand 40% over-voltage steady. So exact 9V is on the edge.

There's often a little loss in a transistor.

But this plan is for a *latching" relay. We don't apply current steady. We BLIP to switch one way, BLIP to switch the other way. The blips have to be several milliSeconds to get the mechanical bits moving, and R.G.'s blip-constant is 0.1uFd+100K or around 10mS. Even if you blip it once a second, the relay only gets power 1% of the time. You'd have to try a lot harder to burn-up a "5V" relay with 9V just 1% of the time.