John Larkin's LC oscillator
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From: Tim Williams on 11 Jun 2010 08:02 "Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote in message news:1q3316tr0ak2u8rdhr974agci3svmobtjo(a)4ax.com... > Isn't there some young buck out there who can analyze circuits ?:-( Me? Go do it yourself Jim. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: John Fields on 11 Jun 2010 09:16 On Fri, 11 Jun 2010 07:02:03 -0500, John Fields <jfields(a)austininstruments.com> wrote: >On 10 Jun 2010 13:23:55 -0700, Winfield Hill ><Winfield_member(a)newsguy.com> wrote: > > >> In a ringing bell application, as the supply voltage sags, >> and the amplitude drops, I imagine the circuit will move >> from class C back to class A operation, before stopping. > >--- >Why imagine? > >Here's a circuit list that'll show it all _and_ it'll create a .wav >file, "bong.wav" in whatever folder the cicuit's in, so you can hear >it. > >Enjoy! :-) --- Oops... Here it is: Version 4 SHEET 1 936 680 WIRE -384 48 -592 48 WIRE -320 48 -384 48 WIRE -112 48 -224 48 WIRE 16 48 -112 48 WIRE 112 48 16 48 WIRE 16 64 16 48 WIRE 112 64 112 48 WIRE -384 96 -384 48 WIRE -112 96 -112 48 WIRE -448 144 -496 144 WIRE 16 160 16 128 WIRE 112 160 112 144 WIRE 112 160 16 160 WIRE -496 176 -496 144 WIRE -592 192 -592 48 WIRE -272 192 -272 112 WIRE -272 192 -384 192 WIRE 16 192 16 160 WIRE -112 240 -112 176 WIRE -48 240 -112 240 WIRE -384 272 -384 192 WIRE -272 272 -272 192 WIRE -496 288 -496 256 WIRE -112 304 -112 240 WIRE 16 320 16 288 WIRE 112 320 16 320 WIRE 16 336 16 320 WIRE 112 336 112 320 WIRE -592 432 -592 272 WIRE -496 432 -496 368 WIRE -496 432 -592 432 WIRE -384 432 -384 352 WIRE -384 432 -496 432 WIRE -272 432 -272 336 WIRE -272 432 -384 432 WIRE -112 432 -112 368 WIRE -112 432 -272 432 WIRE 16 432 16 416 WIRE 16 432 -112 432 WIRE 112 432 112 416 WIRE 112 432 16 432 WIRE -592 528 -592 432 FLAG -592 528 0 SYMBOL ind2 96 48 R0 SYMATTR InstName L1 SYMATTR Value 20e-3 SYMATTR Type ind SYMBOL ind2 96 432 M180 WINDOW 0 36 80 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName L2 SYMATTR Value 500e-6 SYMATTR Type ind SYMATTR SpiceLine Rser=.01 SYMBOL npn -48 192 R0 SYMATTR InstName Q1 SYMATTR Value 2N3904 SYMBOL res -128 80 R0 SYMATTR InstName R1 SYMATTR Value 100k SYMBOL cap 0 64 R0 SYMATTR InstName C1 SYMATTR Value 10e-6 SYMBOL voltage -592 176 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 24 104 Invisible 0 SYMATTR Value 5 SYMATTR InstName V2 SYMBOL pnp -448 192 M180 SYMATTR InstName Q3 SYMATTR Value 2N4403 SYMBOL voltage -496 272 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 24 104 Invisible 0 SYMATTR Value PULSE(5 0 0 1e-6 1e-6 .01) SYMATTR InstName V1 SYMBOL npn -320 112 R270 SYMATTR InstName Q2 SYMATTR Value 2N3904 SYMBOL cap -288 272 R0 SYMATTR InstName C4 SYMATTR Value 1e-6 SYMBOL res -400 256 R0 SYMATTR InstName R2 SYMATTR Value 100k SYMBOL res -512 160 R0 SYMATTR InstName R3 SYMATTR Value 1000 SYMBOL cap -128 304 R0 SYMATTR InstName C2 SYMATTR Value 1e-7 SYMBOL res 0 320 R0 SYMATTR InstName R4 SYMATTR Value 750 TEXT 32 184 Left 0 !K1 L1 L2 1 TEXT -528 464 Left 0 !.tran 5 TEXT -528 496 Left 0 !.wave .\\bong.wav 8 10000 N008
From: John Larkin on 11 Jun 2010 10:47 On Fri, 11 Jun 2010 07:02:44 -0500, "Tim Williams" <tmoranwms(a)charter.net> wrote: >"Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote in >message news:1q3316tr0ak2u8rdhr974agci3svmobtjo(a)4ax.com... >> Isn't there some young buck out there who can analyze circuits ?:-( > >Me? > >Go do it yourself Jim. > >Tim I like the way it works with a very high turns ratio, very small AC drive at the emitter. But at lower ratios, it gets very nonlinear and becomes, if that means anything, a tuned blocking oscillator. The base capacitor value would be lowered so that the cap recharges a bunch during a oscillatory cycle. I'm sure JT and JF will spend the next week diligently searching for a set of values that will make my circuit not work. Then they'll crow, or rather, cluck about it. That's OK: as Woody Allen says, we need the eggs. John
From: Jeroen Belleman on 11 Jun 2010 11:15 John Larkin wrote: > > I like the way it works with a very high turns ratio, very small AC > drive at the emitter. But at lower ratios, it gets very nonlinear and > becomes, if that means anything, a tuned blocking oscillator. The base > capacitor value would be lowered so that the cap recharges a bunch > during a oscillatory cycle. > > I'm sure JT and JF will spend the next week diligently searching for a > set of values that will make my circuit not work. Then they'll crow, > or rather, cluck about it. That's OK: as Woody Allen says, we need the > eggs. I made it squeg. Maybe that will please them. Jeroen Belleman
From: John Larkin on 11 Jun 2010 11:37
On Fri, 11 Jun 2010 17:15:50 +0200, Jeroen Belleman <jeroen(a)nospam.please> wrote: >John Larkin wrote: >> >> I like the way it works with a very high turns ratio, very small AC >> drive at the emitter. But at lower ratios, it gets very nonlinear and >> becomes, if that means anything, a tuned blocking oscillator. The base >> capacitor value would be lowered so that the cap recharges a bunch >> during a oscillatory cycle. >> >> I'm sure JT and JF will spend the next week diligently searching for a >> set of values that will make my circuit not work. Then they'll crow, >> or rather, cluck about it. That's OK: as Woody Allen says, we need the >> eggs. > >I made it squeg. Maybe that will please them. > >Jeroen Belleman Sloman is our resident squegging expert. John |