Search found 2219 matches

by Robert Reed
Sat Aug 23, 2014 9:23 pm
Forum: General Discussion
Topic: Trying to find / download a service manual...
Replies: 6
Views: 1826

Re: Trying to find / download a service manual...

I downloaded a manual a few months ago from one of those sites. You jump thru a bunch of hoops to confuse you and then finally there appears a giant DOWNLOAD button. without going any further I gladly pressed it. Yeah, I got my manual and along with it a host of viruses. For one, it completely took ...
by Robert Reed
Sat Aug 23, 2014 9:09 pm
Forum: General Discussion
Topic: Cure for failing remote controls...
Replies: 6
Views: 1718

Re: Cure for failing remote controls...

I have had that phenomenon happen more times than I'd like to remember. I think its a chemical change in the molecular structure perhaps speeded up by heat and humidity. One thing seems certain - its a "Death Knell" that eventually kills it even if you perform temporary maintenance on it. The only g...
by Robert Reed
Sun Aug 03, 2014 9:07 pm
Forum: General Discussion
Topic: Boda antenna construction
Replies: 4
Views: 3211

Re: Boda antenna construction

I have seen Vertical Dipoles described in that way.
by Robert Reed
Sun Jun 15, 2014 9:17 pm
Forum: General Discussion
Topic: Old Magazines
Replies: 2
Views: 2618

Re: Old Magazines

Great Find Steven! Don't know where to start first :grin:
by Robert Reed
Wed May 21, 2014 9:18 pm
Forum: General Discussion
Topic: Why won't my motor spin?
Replies: 17
Views: 3409

Re: Why won't my motor spin?

Well the mystery is solved and I thought I should share this with you before I close out this post. I did some experimenting with the one shot timing which slowed down rotation speed. At 50 RPM the motor worked perfect just as the circuit was designed to do. Decreasing the one shot timing and conver...
by Robert Reed
Tue May 20, 2014 7:52 pm
Forum: General Discussion
Topic: Why won't my motor spin?
Replies: 17
Views: 3409

Re: Why won't my motor spin?

Hey John and Len Looked at this problem from a different angle and need some backup opinions for my theory. As stated I scoped a consequent drive pulse for each coils energizing and all this time was assuming that the Hall detector was located on that pole piece. but in actuality, the detector could...
by Robert Reed
Tue May 20, 2014 11:48 am
Forum: General Discussion
Topic: Why won't my motor spin?
Replies: 17
Views: 3409

Re: Why won't my motor spin?

John The coils appear to fire one at a time. And to reinforce that action (and again this is just my take on it) If you look at either Hall device you will note either transistor base connected to opposite poles of the hall device. Since each hall will see a positive and negative field from the roto...
by Robert Reed
Mon May 19, 2014 9:42 pm
Forum: General Discussion
Topic: Why won't my motor spin?
Replies: 17
Views: 3409

Re: Why won't my motor spin?

Lemp Qx base drive pulse from Hall device is sequential with Coil x current. does not appear to be any overlap from coil to coil current. Will try to upload current and revised circuit. Revised circuit is a monostable ring style generator with tickle pulse start. All connections and timing match up ...
by Robert Reed
Sun May 18, 2014 9:54 am
Forum: General Discussion
Topic: Why won't my motor spin?
Replies: 17
Views: 3409

Re: Why won't my motor spin?

Yes John the motor runs very free. Manually rotated it in small increments before power up and still nothing. Out of desperation, used a power drill with a rubber snubber attached and made gentle contact with the motor shaft to get it up to speed-still nothing! Would a simplified schematic help?
by Robert Reed
Sat May 17, 2014 9:34 pm
Forum: General Discussion
Topic: Why won't my motor spin?
Replies: 17
Views: 3409

Why won't my motor spin?

Have a blower motor in a piece of equipment that refuses to start at power up about 20% of the time. Did some investigation and here is what I found: It is a four pole brushless motor with two imbedded hall devices placed 90 degrees apart in close proximity to the axis of the shaft in which has a PM...
by Robert Reed
Thu May 15, 2014 7:41 pm
Forum: Nuts & Volts Magazine Discussions
Topic: Zeener Diodes in Parallel: 72 Watt Power Supply, May 2014
Replies: 2
Views: 4140

Re: Zeener Diodes in Parallel: 72 Watt Power Supply, May 201

Are these already built into one of the off shelf items or are they reader built added circuitry. I see no mention of them in the parts list. All good arguments here and the only thing I could add is a reduced source impedance of the zener circuit, which like all other suggestions would be out of th...
by Robert Reed
Sat May 03, 2014 9:12 pm
Forum: Up For Grabs
Topic: Commercial Intercom Components---Long Gone!
Replies: 10
Views: 6997

Re: Commercial Intercom Components

I may have use for a power amp Len. I have a large pond with an even larger Frog problem(thousands and thousands). I have tried everything to rid them, but to no avail. My last ditch thought is an underwater transducer kicked by a heavy power amp. Problem is I have not quite finished with preliminar...
by Robert Reed
Tue Apr 08, 2014 7:58 pm
Forum: General Discussion
Topic: Opinions please
Replies: 5
Views: 1555

Re: Opinions please

OR--- Maybe 'Lytics with the negative polarity stripe. I cant envision any use for diodes here and especially in that size.
by Robert Reed
Thu Mar 13, 2014 9:38 pm
Forum: General Discussion
Topic: Readout window
Replies: 3
Views: 857

Re: Readout window

Hey, thanks a bunch Externet. Did not check Digi or Mouser as did not know how they were categorized. Can even get the bezels too-cool. Will order some soon.
by Robert Reed
Thu Mar 13, 2014 6:43 pm
Forum: General Discussion
Topic: Readout window
Replies: 3
Views: 857

Readout window

I Have Several frequency Counters for retrofitting under construction now. But one part I am having trouble finding is the red transparent window covering the digits. I have tried several plastic retailers in my area and an hour on the web came up empty. With all the LED readouts in this world, you ...