Search found 325 matches

by Bernius1
Mon Aug 15, 2005 12:33 pm
Forum: General Discussion
Topic: rf interference
Replies: 20
Views: 4219

Re: rf interference

Just another thought; most FM receivers have a front end limiter. It's possible that the relay ckt is broadcasting noise loud enough to drop the gain in the front end. This would cause diminished range , while the ckt yet actually works. The only other thing I could think about is that the ground pl...
by Bernius1
Mon Aug 15, 2005 12:10 pm
Forum: General Discussion
Topic: Making hydrogen from water & DC
Replies: 208
Views: 46139

Re: Making hydrogen from water & DC

The funny thing to me is that the perpetrators retain their affirmation of the errant logic. But I see E=MC2 in a prior post. So, is it a 'divide-by-zero' trick, where a zero-mass electron provides infinite energy ? W*H*E*W !! I made it to the end of this post. So, here are....
MY
LAST
WORDS !
by Bernius1
Thu Jun 16, 2005 4:54 am
Forum: General Discussion
Topic: Summer Project
Replies: 4
Views: 904

Re: Summer Project

Whaddayathinkofthisone ? A small piece of glass , a Peltier-junction element, two temp sensors, and an optical (LED/ x-istor pair) sensor, and a PIC. A humidity sensor alone cannot determine if it IS raining , or if it HAS or WILL rain. Put the cold side of the Peltier junction on the glass. The two...
by Bernius1
Thu Jun 09, 2005 5:38 am
Forum: General Discussion
Topic: Small battery load test.
Replies: 8
Views: 1748

Re: Small battery load test.

Hey J ! No, I'd never short a car battery. But for 9V's , the spoon over the terminals works fine. You only have to short it long enough to drop the voltmeter to near zero, then release. All of the real information in a load test is derived from the voltage recovery. Any resistor able to sufficientl...
by Bernius1
Tue Jun 07, 2005 12:37 pm
Forum: General Discussion
Topic: Small battery load test.
Replies: 8
Views: 1748

Re: Small battery load test.

All you need are a voltmeter (analog) and a spoon. You read the voltage, short the battery for about 1/2 second , and watch the needle recover. If it drops to around 1/2 rated voltage and comes right up, battery good. If it drops to 5%>50% rated voltage, and recovers to rated voltage, it's weak ( bu...
by Bernius1
Tue Jun 07, 2005 12:27 pm
Forum: General Discussion
Topic: Halon and/or Refrigerant Detector
Replies: 9
Views: 1577

Re: Halon and/or Refrigerant Detector

Grainger. Pricey, but it's there.
by Bernius1
Tue Jun 07, 2005 8:54 am
Forum: General Discussion
Topic: Relatively Compact Power Generation Using Fuel
Replies: 40
Views: 6828

Re: Relatively Compact Power Generation Using Fuel

In Mexico they make these things that fit on a bicycle, make power all day, and only require 2 or 3 tacos daily to do this.........
by Bernius1
Mon Jun 06, 2005 7:23 am
Forum: General Discussion
Topic: Parabolic Antenna
Replies: 7
Views: 1338

Re: Parabolic Antenna

I've gotta throw in a tangential anecdote; Several years ago, I met guy in a bus company in Staten Island, whose 'friend in Brooklyn' made copycat cards for dish receivers. But if the satellites received two Ser #'s simlutaneously.... Well, suddenly, the card was fried, & the box temporarily useless...
by Bernius1
Sat Jun 04, 2005 8:54 am
Forum: General Discussion
Topic: Is there any vacuum tube audio diy fan?
Replies: 8
Views: 1624

Re: Is there any vacuum tube audio diy fan?

I unfortuately have an RIP on this one. A mechanic in our shop, affectionately named "Paulie-O" (A trick on 'polio', because if a woman met him, she couldn't 'walk away'!). Anyway, he died last month at 55 of cancer. A Viet Nam Vet and guitarist, he could describe any standard tube amp, including mi...
by Bernius1
Sat Jun 04, 2005 8:44 am
Forum: General Discussion
Topic: Relatively Compact Power Generation Using Fuel
Replies: 40
Views: 6828

Re: Relatively Compact Power Generation Using Fuel

It's interesting to consider 'energy density' , and to see the great orders of magnitude between them: Anti-matter (greatest) Nuclear Chemical Mechanical Electrical Gravitational The greatest chemical densities are represented as the most violently reactive (explosive). Johnson Wax's J-Shop 1200 is ...
by Bernius1
Fri Jun 03, 2005 8:21 am
Forum: General Discussion
Topic: component placement
Replies: 0
Views: 600

component placement

Premise : Standard op-amp, Rf ( feedback resistor ) yielding gain of 50 (arbitrarily). Placing a capacitor-to-ground in the feedback loop should act as a low-pass amplifier , or high pass ? AND , ( what I really want to know ) Is there a difference between placing the capacitor between the output an...
by Bernius1
Fri Jun 03, 2005 6:12 am
Forum: General Discussion
Topic: IR remote circuit running out of steam?!
Replies: 47
Views: 8665

Re: IR remote circuit running out of steam?!

I admittedly didn't read the whole thread, though most suggestions seem viable. But here's my take;<p>The first sentence in the Ckt descrip.says 'during idle time' the cap is charging. So I think the ckt is designed as intermittent (TV remote) and not data x-fer. That said, the 4700uf's charge curve...
by Bernius1
Fri Jun 03, 2005 5:49 am
Forum: General Discussion
Topic: Simple presence detector help?
Replies: 6
Views: 1634

Re: Simple presence detector help?

Hey ! Has anyone tried a cordless barcode scanner ? With every pass, all you'd have to do is store the data string, and compare it with the next/previous pass. And two might give depth of field .
Try this site for industrial light curtains and scanners.
Lots-o-downloads.
by Bernius1
Thu May 26, 2005 1:21 pm
Forum: General Discussion
Topic: Tips and Techniques
Replies: 27
Views: 4499

Re: Tips and Techniques

WOW !! I'm reading this at my desk. Very thoughtful. So I'll add; **I hang my hammers on nails driven in my shop wall. The weight of the hammer acts like it's pulling out the nail, but it can't so it hangs. **For larger spools, I use wire hangers, take the last inch or two, and bend it inwards. Then...
by Bernius1
Thu May 26, 2005 10:07 am
Forum: General Discussion
Topic: Tips and Techniques
Replies: 27
Views: 4499

Re: Tips and Techniques

This may sound nubious, but it worked. I replaced a triac on a touch lamp with a part I had 'in hand'. Its ratings were higher, so it required more holding current. At the gate, I got three stepped voltages, but too low and with insufficient current to even light it dimly on 'high'. So, seeing that ...