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BTW, your URL is missing a DOT after www. Here is the "corrected" URL. https://www.tesladownunder.com/WorldsBrightestBike.htm#BikeLights Ken W7EKB

I rode/drove/almost-died-more-than-once on motorcycles for awhile when I was much younger and a bit more stupid than I am now. I have an over-worked guardian angel. Harley-Davidson. Almost big

A friend and fellow idiot sent me this link https://www.tesladownunder.com/WorldsBrightestBike.htm#BikeLights I am impressed and bow down to this guy. [and I'm glad I live nowhere close to him.] I

I too build an arc lamp: I used ?” carbon rods and a full-sized arc welder. It was very noisy! I focused the beam. It was about 10kWatt. Later I rectified and filtered the AC to DC and added

If you use a cheap standard Lanche' cell, the carbon rod will generally be present. Just checked for the fun of it. Really messy. I used "D" cells from Krogers. I built an arc light using the carbon

I have taken the carbon rod from Carbon/zinc batteries for different projects. The last time I did, they were built different. No single carbon rod down the middle. I don't know when they started

Wiki has an interesting article on batteries https://en.wikipedia.org/wiki/List_of_battery_sizes I am not sure I'd bet my life on the accuracy of the information, but it is informative.

Going way back in time, radios used 3 batteries *A Battery* powered the filament, very few tubes had indirectly heated cathodes, the filament was the cathode because it was so much more efficient.?

When I was young, we had one of those AC/battery powered tube radios.? It was the only one I remember seeing but I'm sure they weren't that uncommon.? I never saw the innards, but I imagine the B+

I'd have to dig through my "lab notebooks." All in 3 photocopy boxes filled with notebooks and sheets of paper. I'm recovering from bronchitis, my wife would have called 911 last Friday night if she

I remember running into stuff that used various batteries whose voltage tended toward higher than flashlights, 15V, 22-1/2V, 30V, 45V, 67-1/2V, and 90V. Some projects in sixties Popular Electronics

I use dual 120F capacitors in our solar powered LED street markers that are embedded in the highways. DOT regulation requires the lights to be able to be lit for at least 16 hours/night. Bertho

As Donald pointed out, alkaline cells/batteries have a fairly high internal resistance, the old carbon zinc Leclanché cells had an even higher internal resistance. [I had to go pick up a

I remember in my high school days (1956) of removing the vibrator in many friends cars, banging it on the curb and putting it back in. This broke the "welded" contacts and restarted the pulsed signal

I'll opine that the filament actually only saw about 6V when turned on. The old Carbon-Zinc D cells had a quite high internal resistance. https://data.energizer.com/pdfs/carbonzinc_appman.pdf

I think you can figure that out. Andy

I wondered when you might go there!? :-) My only experience with vibrator power was in the automobile's radio which of course used vacuum tubes (late '50's).? We almost never turned it on.? I

OK I am weird, as a 3 year old (1954) I'd swipe my father's WWII *MX-991/U flashlight. This is the standard right angle headed unit. I'd hide in closets, under the sink, under beds, in the small room

Yup, that's where I got a number of them. "Winmodems", which are absolutely useless to me. -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this

Hello Andy,In the attached folder there is the united circuit where the PID and the driver I chose. I grounded one of the input legs of the differential driver. The driver is desscribed in the