T&L Publications

I did what Haklesup did but attached a little 12.6V charger to the antenna on a 2000 Explorer. It will unplug if I forget to myself. I like that idea of the ammeter connection across the battery disconnect switch. I would expect those Honda batteries under those types of drain/charge conditions to d...

I was helped getting my ham license by how they had recently opened up the technician license category when I took an entry exam.

Hi Mr Al, sorry if I missed replying to something. If you like to send it again I can still try to answer it. I remember now about the diamond things. The little hand files came from Dollar Tree, four in the pack. I also got packs of diamond cutting wheels for my Dremel rotary tool from Harbor Freig...

Howdy Mr Al, thanks for mentioning maybe missing a PM. That wasn't any problem considering how things can happen in life.

I had some of those files that came four in a pack. I think they indeed were pretty low quality.

haklesup, those thoughts remind me how diamond fingernail files deteriorated much faster than I expected when filing steel nails or black drywall type screws, as far as I can remember.

Reminds me of when cutting steel with a diamond impregnated circular saw blade. The diamond tends to dissolve.

Indeed! You're welcome.

I inserted a rectifier and switch into the cord, so that through the diode is low, and bypassed is high.

I found thick grounding wire at the hardware store. I think it is six gauge.

I like the idea of the bare solid copper wire tip and have done it that way for a long time.

I refined my circuit today on LTspice. I added the emitter follower on the input like I was thinking earlier, and added another one to buffer the pull-up resistor. I was thinking about lowing the value of the 47ohm resistor since I noticed little or no actual effect by including it in the circuit at...

I think adding another 2N3904 as an emmitter follower for the input would be good to try.

I think I am probably in the knee region of figure 4 right now (at the last linked site). Yet after further looking at the graph, I think that isn't right. Since power is still a little over half of the rated output by my reckoning, operation has to be on the red (safe part) of the curve. I did noti...

I have two microwave ovens, one on power pulsing and the other also on that, but also given voltage reduction. I noticed some of my things needed much more pulsing and for much longer than ovens were set up for. My first oven ended up with stuck timer contacts from too much cycling. I made an extern...

Howdy, I had an old Texas Instruments calculator that appears to have predated the TI 30 that had a wall wart using a transformer like that. I seem to recall that it even regulated the output with just a zener diode. Presently I have a choke that I made with a roll of wire as the magnetic core. I wo...

I had an inductor coil in mind that had a small inner diameter, and enough Iayering to make the outer diameter about ten times the inner, or more. Say ¼" inside, 2" outside diameter, and maybe something like 3" long. I haven't been a fan of iron or steel leads because of concerns abou...