Twin T circuit wanted
in [Basics]
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From: default on 5 Jun 2010 08:42 Can someone supply a single transistor circuit that will give a damped sine wave when a pulse is applied? to emulate a bell sound --
From: Jamie on 5 Jun 2010 09:54 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.
From: default on 5 Jun 2010 10:49 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. --
From: krw on 5 Jun 2010 11:55 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. If you've got a PIC, why not use it?
From: default on 5 Jun 2010 12:59
On Sat, 05 Jun 2010 10:55:09 -0500, "krw(a)att.bizzzzzzzzzzzz" <krw(a)att.bizzzzzzzzzzzz> 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. > >If you've got a PIC, why not use it? The pic is just putting out de multiplexed pulses (only 4 outputs on the chip expanded to 12) to operate solenoids to strike chimes. Pics don't make sine waves very well without a lot of extra effort. The end goal is a mechanical chime system that can be programmed for different melodies. I have a goal in mind, I'm not interested in changing the goal, and this is just a little side excursion to aid in testing. -- |