T&L Publications

I am afraid that you are SOL on what you want to do here. The P6105 is a garden variety passive probe with all their shortcomings. Basically a series 9 meg resistor shunted by a 10 pf capacitor at the tip. The comp box at the other end has a variable capacitor to ground that is adjusted in conjuncti...

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 ...

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. ...

I have seen Vertical Dipoles described in that way.

Great Find Steven! Don't know where to start first

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...

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...

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...

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 ...

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?

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...

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...

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...

OR--- Maybe 'Lytics with the negative polarity stripe. I cant envision any use for diodes here and especially in that size.

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.