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That crowbar circuit in the referenced pdf didn't make a whole lot of sense to me. Not that I examined it that closely, it's approaching the limit for what I can see on this monitor. But do you

I last messed with the 723 somewhere in the early 1970s. I'm guessing that this was before the common 3-terminal regulator parts were pretty much everywhere. I have very little reason to consider

Note 3 should read Add a 0.01uF capacitor with a 27~33 ohm resistor in series across each power rectifier to minimize commutation EMI [radio noise]. I have a nice PDF on diode commutation noise and

First I consider Astron power supplies to be over rated and exist only because "hams have always used them." I'm amazed [really more dismayed] they get decent reviews. There are too many

When a member of our shortwave listener club showed me a PA0RDT active E-Probe antenna I almost giggled, being polite I didn't giggle. However I thought "Well PT Barnum was right...one is born every

Re: " Honda stock electrics sucked almost as bad as Lucas." I've never been able to understand the original stock Honda 350/360 charge system. It appeared to be a SCR that shorted out the V+ after a

An interesting read, that. I've been pretty lucky, the closest I've come to that kind of an encounter is the other end of the town where I lived before I moved over here. That, and one other

I'm really a shortwave listener who happened to pick up his ham license. https://en.wikipedia.org/wiki/1974_Super_Outbreak That nightmare convinced me ham radio had a use. I rode a Honda CB350 with a

I remember seeing them mentioned a fair amount back when, not so much lately. I can believe that.

At one time 88mH (and other value) inductors were as common as roaches and just about as valuable. Today they are scarce, a quick net search didn't find any 'real' 88mH loading coils for sale. RTTY

I've heard of those things for a really long time. Seen them referenced in magazines, etc. But I don't think that I've ever actually run across them... I do have some toroid coils, no idea what

All sorts of stuff: https://mysite.du.edu/~etuttle/electron/elecindx.htm -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a

I have several software programs that emulate the old CRT mark/space vertical/horizontal? display with a simulation on the PC screen. It isn't as accurate as the CRT display, I'd say it's about 60%

Heh. I remember seeing a setup like that. This was so long ago that I can't even remember when it was. Somebody I knew thought that I might perhaps be interested in ham radio, and introduced me to

I found a stash of 5 'new old stock' 5CP1 5 inch oscilloscope CRTs at my parent's home. The new owners called my sister and told her they found a box of "electrical junk" under the eves. I went over,

The published charts/formula for delay are all wrong, or 'wrong' for certain manufacturers CMOS 555's.. I spent several hours cut and pasting RC values to get the time delay I needed. All 555 are not

How so? -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A.

Try a 15k or 20k pot....turn the knob and the display should change.

86164.0905 seconds ( https://en.wikipedia.org/wiki/Second ) (23 h 56 min 4.0905 s or 23.9344696 h). Another way to understand this difference is to notice that, relative to the stars, as viewed from

Simple logic would suggest 10k +/- 2K Tony