On Wednesday 27 October 2021 10:58:33 pm Glen Slick wrote:
On Wed, Oct 27, 2021 at 7:53 PM Jim Ford <james.ford@...> wrote:
This might have been the video which was relevant to capacitor
discussion in this thread:
Are Your Capacitors Installed Backwards? Build this and find out
Wow, talk about over-complicating things...
You don't need a scope to do this test. Just a wire plugged into any handy audio amplifier will do. One way will get you more hum out of the speaker than the other. An RCA jack allows the use of any handy audio patch cable and it's way cheaper than a BNC.
If you do want to build a gizmo, you don't need 3 ICs, either, just a pair of transistors in an astable multivibrator circuit. Put the LEDs in line with the collector of each transistor, and when that one turns on that transistor's collector is going toward ground. If I were going to build something like that a bit of perf board would do, no need to make a circuit board, no surface mount parts either.
He mentions the "CD" prefix as being more tolerant of higher power supply voltages than other brands. If he'd gone with the original 4066 rather than the 74HC4066, they can handle power supply voltages of up to 15V no problem.
He also mentions wanting longevity in terms of operation, but uses a bipolar 555 rather than the CMOS 7555.
Not much of a fan of that channel, I guess...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
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Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
