Search found 1253 matches

by Dean Huster
Sat Jan 19, 2013 1:24 pm
Forum: General Discussion
Topic: Motorcycle Safety Devices
Replies: 6
Views: 1922

Motorcycle Safety Devices

OK. We need to start a new topic, this a bit off-topic from elecronics. As I review the alarming statistics of accidents where motorcycle riders are seriously injured, I realize that automobile safety standards have not been equally applied to motorcycles. That strikes me as a bit prejudicial, so I'...
by Dean Huster
Sat Jan 19, 2013 1:18 pm
Forum: General Discussion
Topic: High Voltage Circuit
Replies: 16
Views: 4316

Re: High Voltage Circuit

WITH LED FLASHLIGHT, no less! But alas, unless it includes a can opener, I don't see buying it. Maybe a better item would be dual use also: Push one button for a spritz of perfume, another for a blast of pepper spray. But really, 7.8 millions volts? And how did they measure that? And how did they in...
by Dean Huster
Tue Jan 15, 2013 1:21 pm
Forum: General Discussion
Topic: High Voltage Circuit
Replies: 16
Views: 4316

Re: High Voltage Circuit

That air purifier circuit used a 1X2 or some other HV rectifier and wasn't a compact circuit overall. No other HV circuits in 1970, 1970 or 1972. Some of the extra history of Popular Electronics surfaces in these issues. In 1970, they started dumping long-time columns such as "Short-Wave Listening" ...
by Dean Huster
Fri Jan 04, 2013 7:00 pm
Forum: General Discussion
Topic: High Voltage Circuit
Replies: 16
Views: 4316

Re: High Voltage Circuit

I've been wanting to catalog the PE contents and decided to begin now. The circuit isn't in the Jan, Feb, Mar or Apr 1970 issues. More later.
by Dean Huster
Mon Dec 31, 2012 9:38 am
Forum: General Discussion
Topic: High Voltage Circuit
Replies: 16
Views: 4316

Re: High Voltage Circuit

I have nearly every Popular Electronics issue publilshed. But going through 120 magazines for that one circuit is a bit time-consuming. Can you zero-in on the title of the article? Annual indices were published in the December issues on-and off and there may not be any help there. The SWTP site won'...
by Dean Huster
Sun Dec 23, 2012 1:02 pm
Forum: General Discussion
Topic: 12^3
Replies: 3
Views: 1252

Re: 12^3

The wife wasn't so darned impressed. She's a labor & delivery nurse here and there were all kinds of patients insisting that they be induced so they could have their kid on 12/12/12. It's so ridiculous. As for the time, it's a little flawed on a 24-hour clock with 1212:12 and calendar-wise the flaw ...
by Dean Huster
Fri Oct 26, 2012 6:14 pm
Forum: General Discussion
Topic: Decimal to seven segment conversion...
Replies: 9
Views: 2465

Re: Decimal to seven segment conversion...

The 74154 essentially does what a diode matrix would do and in the same amount of space even though it is a 24-pin chip on 0.6 row centers. I don't know if there's a CMOS version and if so, is probably small so you'd have to cascade a couple. Another option that might take up even more space is to p...
by Dean Huster
Fri Oct 26, 2012 6:10 pm
Forum: General Discussion
Topic: Another Car Audio Amp ( 5,000W - Mono ) :O
Replies: 28
Views: 6612

Re: Another Car Audio Amp ( 5,000W - Mono ) :O

The uninitiated don't realize that about 3/4 of the circuitry in one of these car amps is not amplifier -- it's power supply just to get the higher voltages required to have that massive output power available. If all you have to work with is the 12v from the car, you're limited to just a few tens o...
by Dean Huster
Mon Oct 08, 2012 7:41 pm
Forum: General Discussion
Topic: Light dependent resistors...
Replies: 7
Views: 2138

Re: Light dependent resistors...

In most applications, it's just where you put the LDR in a voltage divider that will reverse its resultant action .... on the supply side or on the grounded side.
by Dean Huster
Sun Sep 16, 2012 3:10 pm
Forum: General Discussion
Topic: Bad Bulbs?
Replies: 19
Views: 3936

Re: Bad Bulbs?

.... condensation forms inside the fixture at night while the lamp is off.
I find that in the odd world where I live, most of my outdoor lamps are off during the day (I guess we use the sun a lot more here); at night, the lamp is on and would chase moisture away.
by Dean Huster
Sat Sep 08, 2012 12:16 pm
Forum: General Discussion
Topic: Ceiling Fan wiring
Replies: 26
Views: 6459

Re: Ceiling Fan wiring

All the fans I've seen (and since I do handyman stuff for a living now, I seen lots of them) have three-wire caps -- dual caps. Running wiring through ceiling and walls for the cap only is pure nuts. First of all, it has to be Romex to be "legal" for 120v use. Second, it would be weird and unknown w...
by Dean Huster
Tue Aug 28, 2012 8:08 pm
Forum: General Discussion
Topic: WHERE ARE THEY?
Replies: 32
Views: 8355

Re: WHERE ARE THEY?

dacflyer, remember that N&V wasn't originally a hobbyist experimenter magazine -- or newsprint tabloid of the same genre. It started out as a newsprint tabloid with nothing but electronics-oriented classified ads. That genre was gradually changed by the publisher when the "writing on the wall" was s...
by Dean Huster
Fri Aug 24, 2012 6:26 pm
Forum: General Discussion
Topic: WHERE ARE THEY?
Replies: 32
Views: 8355

Re: WHERE ARE THEY?

Considering the fact that the Electro-Tech forum ( http://www.electro-tech-online.com/general-electronics-chat/ ) is busier than a one-armed paper hanger, I'd say that the N&V forum has very little to offer anymore. Sad to say, I know. The N&V forum has gradually slid downhill in usage and seems to ...
by Dean Huster
Sat Jul 28, 2012 6:14 pm
Forum: General Discussion
Topic: Scope question...
Replies: 7
Views: 2766

Re: Scope question...

I didn't see that comment on their site. Still, they're talking about system bandwidth: probe + scope. As mentioned, a 10X probe will give the best system bandwidth figures IF the probe has a bandwidth that is a LOT higher than that of the scope. A 100MHz probe on a 100MHz scope DOES NOT give you a ...
by Dean Huster
Fri Jul 06, 2012 7:59 pm
Forum: General Discussion
Topic: AC Detector
Replies: 3
Views: 1693

Re: AC Detector

Yep. In the electrical tool section at Home Depot. And they have some built into the handle of screwdrivers, too, which can be a nice safety thing -- but then the dedicated versions have insulated probes.