Circuit Challenge of the Day
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From: TTman on 18 Dec 2009 17:27 "Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com/Snicker> wrote in message news:7rvni5paadb1tmuocnqjqmjm2qa3tg8mc8(a)4ax.com... > On Fri, 18 Dec 2009 21:01:33 -0000, "TTman" <someone.pc(a)ntlworld.com> > wrote: > >> >>"Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com/Snicker> >>wrote in message news:90dni5dpk2qgvmio5f82piv3ov07u0sm9u(a)4ax.com... >>> Circuit Challenge of the Day >>> >>> The following circuit... >>> >>> http://analog-innovations.com/SED/RampGenerator_Amusement.pdf >>> >>> is a ramp generator. >>> >>> It is easy to see how the upper trip point circuitry causes discharge >>> of the ramp. >> >>Is it ? >> >>> >>> But what causes the turn-around at the bottom? >>> >> >>Errr R3? lol >> > > Errrr! How? This isn't multiple choice... Tell me a sequential set > of events that causes Q1 to turn off when the ramp bottoms. > Lighten up Jim, it was a tongue in cheek joke..... I know zip about analogue, remember ?
From: ian field on 18 Dec 2009 18:32 "Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com/Snicker> wrote in message news:90dni5dpk2qgvmio5f82piv3ov07u0sm9u(a)4ax.com... > Circuit Challenge of the Day > > The following circuit... > > http://analog-innovations.com/SED/RampGenerator_Amusement.pdf > > is a ramp generator. > > It is easy to see how the upper trip point circuitry causes discharge > of the ramp. > > But what causes the turn-around at the bottom? Years ago I put together a circuit for messing with random inductors, it was based on a bistable and the "off" state was tripped by the rise to saturation current in the driver transistor. The fun part was sensing when the flyback voltage had peaked and was on its way back, to trip the bistable on state. The circuit would be easily recognisable if I could find it - it was a dead bug/bird's nest type thing, but it seems to have vanished without trace - I'm pretty sure I documented the development, but I can't find that either.
From: Phil Hobbs on 18 Dec 2009 19:47 ian field wrote: > "Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com/Snicker> > wrote in message news:90dni5dpk2qgvmio5f82piv3ov07u0sm9u(a)4ax.com... >> Circuit Challenge of the Day >> >> The following circuit... >> >> http://analog-innovations.com/SED/RampGenerator_Amusement.pdf >> >> is a ramp generator. >> >> It is easy to see how the upper trip point circuitry causes discharge >> of the ramp. >> >> But what causes the turn-around at the bottom? > > Years ago I put together a circuit for messing with random inductors, it was > based on a bistable and the "off" state was tripped by the rise to > saturation current in the driver transistor. The fun part was sensing when > the flyback voltage had peaked and was on its way back, to trip the bistable > on state. > > The circuit would be easily recognisable if I could find it - it was a dead > bug/bird's nest type thing, but it seems to have vanished without trace - > I'm pretty sure I documented the development, but I can't find that either. > > Sounds a bit like a Royer converter. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
From: Tim Williams on 18 Dec 2009 21:07 "Jon Kirwan" <jonk(a)infinitefactors.org> wrote in message news:u5tni5du7c86ufih2bhdobop109ik6vah2(a)4ax.com... <snip> > I actually like the way it works. I just didn't like the way Jim drew > the darned thing. I still don't quite like it -- I'd like to see Q3 and Q4 together, since they're basically an RTL NOR gate (Q4 having a peculiar turn-off voltage). Then invert it with Q2, feed back to Q4 and drive Q1, and you have your driver part, from left to right. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: Jon Kirwan on 18 Dec 2009 21:20 On Fri, 18 Dec 2009 20:07:15 -0600, "Tim Williams" <tmoranwms(a)charter.net> wrote: >"Jon Kirwan" <jonk(a)infinitefactors.org> wrote in message >news:u5tni5du7c86ufih2bhdobop109ik6vah2(a)4ax.com... ><snip> >> I actually like the way it works. I just didn't like the way Jim drew >> the darned thing. > >I still don't quite like it -- I'd like to see Q3 and Q4 together, since >they're basically an RTL NOR gate (Q4 having a peculiar turn-off voltage). >Then invert it with Q2, feed back to Q4 and drive Q1, and you have your >driver part, from left to right. Well, draw it up the way you'd like. I'd love to see that, if you can afford the moment to do it. Honestly. It might help me do a better job thinking about other things to see a little better about redrafting stuff like this. Anyway, I'd appreciate your shot at it if you feel like trying a hand at it. (I don't agree about your wish for Q3 and Q4, right now, but if you draw it up the way that makes better sense to you I might change my mind about it and learn something.) Thanks, Jon
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