Search found 325 matches

by Bernius1
Thu May 26, 2005 9:58 am
Forum: General Discussion
Topic: ian's grammactical rules
Replies: 48
Views: 8624

Re: ian's grammactical rules

Dean, the poem and sentiments are all great. I think Dr_when hit a valid point when he posed " 2b^!2b ", because it's a logical problem. At first reading ( and that too fast ) I thought he wrote '2b or |2b|', and said ' That's it ! The misspellers think in absolute values ! That's how they accept er...
by Bernius1
Sat Apr 09, 2005 6:09 am
Forum: General Discussion
Topic: PCB made out of acrylic ?!?
Replies: 19
Views: 4537

Re: PCB made out of acrylic ?!?

How's this idea? Take a foot of 20-24 ga. stranded wire, strip it, and use the fine strands to solder directly to the SMD LED's, making a spider's web or net. Now you can either hang it in the box, looking like a real spider's web,or super glue the net to the acrylic. For crossed lines & touch point...
by Bernius1
Tue Apr 05, 2005 1:03 pm
Forum: General Discussion
Topic: Unsoldering IC's
Replies: 15
Views: 2749

Re: Unsoldering IC's

mpja.comhas an SMD rework station that seems nice. If you look at the tips listed under the unit, one may fit for DIP's.
Hmmm. 'good luck'? No 'cheers'? Nah..
Ahhh... Später !
by Bernius1
Thu Mar 31, 2005 10:49 am
Forum: General Discussion
Topic: narrow band receiver transmitter
Replies: 9
Views: 1644

Re: narrow band receiver transmitter

Are you REALLY in the USA ? If you are, you can buy any FM radio as a receiver , and buy a wireless FM-band microphone at most toy stores for under $20.00. All you will lack is range. Why? Because power out put AND transmitting antenna design are fixed by design, and spec's are sent to the FCC for f...
by Bernius1
Mon Mar 28, 2005 1:43 pm
Forum: General Discussion
Topic: CELL JAMMER
Replies: 28
Views: 5867

Re: CELL JAMMER

AM radios (& sometimes computers )pick up the broadcasted packets from a cellphone as a 'chick-chick-chick' sounding distortion. But I don't get it so much from the 1.4GHz+ phones , as from the older 800MHz-900MHz phones. Either way, it's an AM modulation, so a receiver looking for those clicks need...
by Bernius1
Mon Mar 28, 2005 1:35 pm
Forum: General Discussion
Topic: LM324 tester?
Replies: 13
Views: 2996

Re: LM324 tester?

Dac, How is the LM324 fitted in the ckt ? I ask because I didn't see in your post if it's a current feedback ckt, or buffers for the CPU chip. Can you give a quickie schematic of the components in the immediate vicinity? Does it integrate a square wave ? Do the 4 act together (quad osc.)? Also; I ha...
by Bernius1
Sat Mar 26, 2005 7:28 am
Forum: General Discussion
Topic: simple diode question
Replies: 4
Views: 964

Re: simple diode question

Cato, you're absolutely right, but I don't think that signal or junction capacitance are involved with either the 1N4000 series, or other common switching diodes, like 1N4148. If it is, it's probably a mis-applied replacement for a signal diode. I'm not in disagreement, just seeing the larger target.
by Bernius1
Wed Mar 23, 2005 11:59 am
Forum: General Discussion
Topic: Need help with center tap Xformer
Replies: 70
Views: 12576

Re: Need help with center tap Xformer

ELECTRON-VOLTS. Correct. Distance matters ( Spark plug gap ), and charge builds at the tip. Take a spring-top 6V battery & a utility razor blade. Scuff the razor edge until arcing starts, then lift slightly off one of the pigtails about 1/64th inch (.4mm for the French ). The arc can be maintained u...
by Bernius1
Wed Mar 23, 2005 6:00 am
Forum: General Discussion
Topic: power supply circuit
Replies: 16
Views: 3321

Re: power supply circuit

Edd, I know the values are way out. The ckt was a 30-second cut & paste. A PIC , or even 555 will have to switch a higher freq MOSFET. I really like your ckt, except that it's more like a reference supply for a sensor, than a secondary reversed power supply (current-wise). I did want to use the flyb...
by Bernius1
Wed Mar 23, 2005 5:43 am
Forum: General Discussion
Topic: The topic is topics
Replies: 14
Views: 2218

Re: The topic is topics

JOHN ! Politically correct, it's not 'querent', but "alternate lifestyle rent". I think the best reproof is no response. I think the line was crossed with the 'hydrogen' thread for buffoonery, but I always enjoy reading the remarks of other listers. I really have to read EVERY thread, because most d...
by Bernius1
Tue Mar 22, 2005 6:09 am
Forum: General Discussion
Topic: power supply circuit
Replies: 16
Views: 3321

Re: power supply circuit

Edd, I've seen supply circuits that reverse polarity. Take a look at http://img8.exs.cx/img8/5755/polarity3eb.jpg this image. (This is the direct link http://img8.exs.cx/img8/5755/polarity3eb.jpg ) "thanks to imageshack" . Assuming that this is a square wave out of a PIC at TTL levels, will the outp...
by Bernius1
Tue Mar 22, 2005 5:15 am
Forum: General Discussion
Topic: Need help with center tap Xformer
Replies: 70
Views: 12576

Re: Need help with center tap Xformer

Like dominoes. Each moves slightly, but the initial tipping force carries indefinitely.
by Bernius1
Mon Mar 21, 2005 4:19 am
Forum: General Discussion
Topic: Need help with center tap Xformer
Replies: 70
Views: 12576

Re: Need help with center tap Xformer

3rd logical option; BOTH are right. Electrons move (Feynman again) about 1"/sec in copper wire. That seems to agree with Stephen. However, in AC, they'll move a little one way, and then back the other way. Remember , an amp is one coulomb/sec. So, at 60Hz and 1A, 1/120th of a coulomb moves a fractio...
by Bernius1
Fri Mar 18, 2005 4:37 am
Forum: General Discussion
Topic: Need help with center tap Xformer
Replies: 70
Views: 12576

Re: Need help with center tap Xformer

OK At the risk of sounding very,very,very redundant; If you take a center-tapped x-fmr, and use TWO bridge rec's, top & bottom with a 78L05 & a 79L05, you've got a nice bi-polar supply. NOW, take those two stacked bridge rec's on a 2-wire secondary (no center tap, or just disconnect it). Without the...
by Bernius1
Thu Mar 17, 2005 3:56 am
Forum: General Discussion
Topic: Can anyone help?
Replies: 24
Views: 3576

Re: Can anyone help?

So the lesson is; 'gullible' IS in the dictionary, but not in any elec-tech manuals ? As far as a numerically generated noise profile, I still think a 10-sec sample of repeatable noise is a decent idea for routing out intermittent problems. Or a program that took the same sample, and with each repet...