Twin T circuit wanted
in [Basics]
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From: john jardine on 6 Jun 2010 13:05 "default" <default(a)defaulter.net> wrote in message news:9dhk06dltvk703cdpri3dt91bvjnbjr6cf(a)4ax.com... > Can someone supply a single transistor circuit that will give a damped > sine wave when a pulse is applied? to emulate a bell sound > -- ,---------, | |5V .-. - | | --- | |4k7 | '-' === | GND ,-----------------------------o-----o | | | Damped Sine | .-.1M o-------o Out | | | | -> ~1Vpp | | | | | 10k 10k '-' | | ___ ___ || | |/ o---|___|---o--|___|--o--||---o---| BC547 | | | || |> | --- | 10u | | ---100n | o------ | | | | | | === | | --- | || || | | --- 10u '----||-----o----||---' | | || | || .-. | 10n .-. 10n | | .-."Q"Pot | | | | | |<-. | | '-' | | |220 '-'1k 1k | '-' | -> | | | | PIC o------------' === === === Narrow Pulse GND GND GND to Ring (created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)
From: John Larkin on 6 Jun 2010 13:14 On Sun, 06 Jun 2010 08:41:19 -0400, default <default(a)defaulter.net> wrote: >On Sat, 05 Jun 2010 10:06:01 -0700, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Sat, 05 Jun 2010 10:49:18 -0400, default <default(a)defaulter.net> >>wrote: >> >>>On Sat, 05 Jun 2010 09:54:04 -0400, Jamie >>><jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote: >>> >>>>default wrote: >>>>> Can someone supply a single transistor circuit that will give a damped >>>>> sine wave when a pulse is applied? to emulate a bell sound >>>>Damped? Do you mean compressed to a sequare wave? >>>> >>>> >>>> You can do a 180 degree phase shift in a double T RC network how >>>>ever, that produces a sine wave. etc.. >>>> >>>> >>>> >>>> >>>> Feed back --||---+---||----+---||-----Base of tranny.. >>>> | | >>>> | | >>>> R R >>>> | | >>>> com com >>>> >>>>ect. >>>> >>>> >>>> >>>Damped as in decaying, just like a bell. >>> >>>Seems to me John Larkin or Jim Thompson posted something like this a >>>long time ago. Searching didn't find exactly what I want. I'm >>>building a set of mechanical chimes but wanted something to use until >>>I work out the kinks - and test the pic timing. >> >>I did a bell simulator once, but I used several, three or four, >>damped-ringing LC resonators. A single one didn't sound very >>bell-like. Turns out that bells have a number of nearby resonant >>modes, each with not-quite harmonics. Complex. >> >>The thing I did drove loudspeakers in the bow of a ship to go >>bong-bong-bong every 30 seconds in the fog, so a crew guy didn't have >>to stand there all night whacking a bell. >> >>Why not use the PIC and a dac? The code would be interesting. >> >>John >> >I want the finished product to have mechanical chimes, the electronic >bells (twelve, with the ability to strike 2-4 at the same time, or >strike one while another is still ringing down) > >To get the timing for the music I thought a little excursion into >electronic bells would be helpful, because the mechanical parts are >unwieldy, and I haven't committed to a mechanical design I'm satisfied >with - then I thought this might also make a killer doorbell . . . a >bit of "mission creep" is setting in. To simulate the chimes, why not a PC with a sound card? There must be tons of suitable software around. John
From: krw on 6 Jun 2010 13:29 On Sun, 06 Jun 2010 10:14:04 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Sun, 06 Jun 2010 08:41:19 -0400, default <default(a)defaulter.net> >wrote: > >>On Sat, 05 Jun 2010 10:06:01 -0700, John Larkin >><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Sat, 05 Jun 2010 10:49:18 -0400, default <default(a)defaulter.net> >>>wrote: >>> >>>>On Sat, 05 Jun 2010 09:54:04 -0400, Jamie >>>><jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote: >>>> >>>>>default wrote: >>>>>> Can someone supply a single transistor circuit that will give a damped >>>>>> sine wave when a pulse is applied? to emulate a bell sound >>>>>Damped? Do you mean compressed to a sequare wave? >>>>> >>>>> >>>>> You can do a 180 degree phase shift in a double T RC network how >>>>>ever, that produces a sine wave. etc.. >>>>> >>>>> >>>>> >>>>> >>>>> Feed back --||---+---||----+---||-----Base of tranny.. >>>>> | | >>>>> | | >>>>> R R >>>>> | | >>>>> com com >>>>> >>>>>ect. >>>>> >>>>> >>>>> >>>>Damped as in decaying, just like a bell. >>>> >>>>Seems to me John Larkin or Jim Thompson posted something like this a >>>>long time ago. Searching didn't find exactly what I want. I'm >>>>building a set of mechanical chimes but wanted something to use until >>>>I work out the kinks - and test the pic timing. >>> >>>I did a bell simulator once, but I used several, three or four, >>>damped-ringing LC resonators. A single one didn't sound very >>>bell-like. Turns out that bells have a number of nearby resonant >>>modes, each with not-quite harmonics. Complex. >>> >>>The thing I did drove loudspeakers in the bow of a ship to go >>>bong-bong-bong every 30 seconds in the fog, so a crew guy didn't have >>>to stand there all night whacking a bell. >>> >>>Why not use the PIC and a dac? The code would be interesting. >>> >>>John >>> >>I want the finished product to have mechanical chimes, the electronic >>bells (twelve, with the ability to strike 2-4 at the same time, or >>strike one while another is still ringing down) >> >>To get the timing for the music I thought a little excursion into >>electronic bells would be helpful, because the mechanical parts are >>unwieldy, and I haven't committed to a mechanical design I'm satisfied >>with - then I thought this might also make a killer doorbell . . . a >>bit of "mission creep" is setting in. > >To simulate the chimes, why not a PC with a sound card? There must be >tons of suitable software around. MP3 player.
From: George Herold on 6 Jun 2010 18:15 On Jun 6, 1:05 pm, "john jardine" <zen177...(a)zen.co.uk> wrote: > "default" <defa...(a)defaulter.net> wrote in message > > news:9dhk06dltvk703cdpri3dt91bvjnbjr6cf(a)4ax.com... > > > Can someone supply a single transistor circuit that will give a damped > > sine wave when a pulse is applied? to emulate a bell sound > > -- > > ,---------, > | |5V > .-. - > | | --- > | |4k7 | > '-' === > | GND > ,-----------------------------o-----o > | | | Damped Sine > | .-.1M o-------o Out > | | | | -> ~1Vpp > | | | | > | 10k 10k '-' | > | ___ ___ || | |/ > o---|___|---o--|___|--o--||---o---| BC547 > | | | || |> > | --- | 10u | > | ---100n | o------ > | | | | | > | === | | --- > | || || | | --- 10u > '----||-----o----||---' | | > || | || .-. | > 10n .-. 10n | | .-."Q"Pot > | | | | | |<-. > | | '-' | | |220 > '-'1k 1k | '-' | > -> | | | | > PIC o------------' === === === > Narrow Pulse GND GND GND > to Ring > > (created by AACircuit v1.28 beta 10/06/04www.tech-chat.de) That's cool, I have no use for it but I'll have to copy it down. George H.
From: default on 6 Jun 2010 22:58
On Sun, 06 Jun 2010 10:14:04 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Sun, 06 Jun 2010 08:41:19 -0400, default <default(a)defaulter.net> >wrote: > >>On Sat, 05 Jun 2010 10:06:01 -0700, John Larkin >><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Sat, 05 Jun 2010 10:49:18 -0400, default <default(a)defaulter.net> >>>wrote: >>> >>>>On Sat, 05 Jun 2010 09:54:04 -0400, Jamie >>>><jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote: >>>> >>>>>default wrote: >>>>>> Can someone supply a single transistor circuit that will give a damped >>>>>> sine wave when a pulse is applied? to emulate a bell sound >>>>>Damped? Do you mean compressed to a sequare wave? >>>>> >>>>> >>>>> You can do a 180 degree phase shift in a double T RC network how >>>>>ever, that produces a sine wave. etc.. >>>>> >>>>> >>>>> >>>>> >>>>> Feed back --||---+---||----+---||-----Base of tranny.. >>>>> | | >>>>> | | >>>>> R R >>>>> | | >>>>> com com >>>>> >>>>>ect. >>>>> >>>>> >>>>> >>>>Damped as in decaying, just like a bell. >>>> >>>>Seems to me John Larkin or Jim Thompson posted something like this a >>>>long time ago. Searching didn't find exactly what I want. I'm >>>>building a set of mechanical chimes but wanted something to use until >>>>I work out the kinks - and test the pic timing. >>> >>>I did a bell simulator once, but I used several, three or four, >>>damped-ringing LC resonators. A single one didn't sound very >>>bell-like. Turns out that bells have a number of nearby resonant >>>modes, each with not-quite harmonics. Complex. >>> >>>The thing I did drove loudspeakers in the bow of a ship to go >>>bong-bong-bong every 30 seconds in the fog, so a crew guy didn't have >>>to stand there all night whacking a bell. >>> >>>Why not use the PIC and a dac? The code would be interesting. >>> >>>John >>> >>I want the finished product to have mechanical chimes, the electronic >>bells (twelve, with the ability to strike 2-4 at the same time, or >>strike one while another is still ringing down) >> >>To get the timing for the music I thought a little excursion into >>electronic bells would be helpful, because the mechanical parts are >>unwieldy, and I haven't committed to a mechanical design I'm satisfied >>with - then I thought this might also make a killer doorbell . . . a >>bit of "mission creep" is setting in. > >To simulate the chimes, why not a PC with a sound card? There must be >tons of suitable software around. > >John > > I don't want to simulate, I want hardware making sound. A PC for a door bell is overkill - and the real thing will be mechanical that is a design goal. -- |