Twin T circuit wanted
in [Design]
|
From: John Larkin on 7 Jun 2010 09:47 On Mon, 07 Jun 2010 06:47:07 -0500, John Fields <jfields(a)austininstruments.com> wrote: >On Sun, 06 Jun 2010 20:24:00 -0700, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Sun, 6 Jun 2010 18:05:57 +0100, "john jardine" >><zen177928(a)zen.co.uk> wrote: >> >>> >>>"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) >>> >> >> >>Here's my ship's fog bell generator, as I remember it. The decay was >>set by tapering off the supply voltage to 4 or maybe 5 LC oscillators, >>so Q didn't matter. It sounded pretty good. >> >>ftp://jjlarkin.lmi.net/Ships_Bell.JPG >> >>A refinement would be to have a separate decay rate for each >>oscillator, since some harmonics of a real bell fade at different >>rates from others. >> >>Yikes, I remember thousands of schematics but can never recall where I >>left my glasses. > >--- >Apparently, since what he asked for was a: "single transistor >circuit". ;) > >JF This is a discussion group, and the subject was circuits that simulate bells. You posted none. Why is that? A single-oscillator version of my thing doesn't sound as good, but it is sort of bell-like. It's a cinch you're not going to simulate 5 damped oscillation modes with one trensistor. [1] Show us your single-transistor bell simulator circuit. John [1] the original touch-tone telephone managed to make controlled-amplitude DTMF tone pairs from a single transistor, sort of defying conventional wisdom about oscillator modes.
From: John Larkin on 7 Jun 2010 11:19 On Mon, 7 Jun 2010 00:51:57 -0400, "tm" <noone(a)msc.com> wrote: > >"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message >news:35po06tdq5g8shn21k3n9pto73i5vm3vjf(a)4ax.com... >> On Sun, 6 Jun 2010 18:05:57 +0100, "john jardine" >> <zen177928(a)zen.co.uk> wrote: >> >>> >>>"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) >>> >> >> >> Here's my ship's fog bell generator, as I remember it. The decay was >> set by tapering off the supply voltage to 4 or maybe 5 LC oscillators, >> so Q didn't matter. It sounded pretty good. >> >> ftp://jjlarkin.lmi.net/Ships_Bell.JPG >> >> A refinement would be to have a separate decay rate for each >> oscillator, since some harmonics of a real bell fade at different >> rates from others. >> >> Yikes, I remember thousands of schematics but can never recall where I >> left my glasses. >> >> John >> >> > >In a like request, how about a GQ alarm? > >I restored a GQ generator on a WW2 sub that used a geared motor to >trigger a damped oscillator with mechanical contacts. Of course it was all >tubes. > >T > The fog bell circuit I did replaced a Henschel unit that actually whacked a metal bar with a solenoid and picked up the result with a magnetic pickup coil. It sounded pretty ratty. John
From: Jim Thompson on 7 Jun 2010 12:01 On Mon, 07 Jun 2010 08:19:42 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Mon, 7 Jun 2010 00:51:57 -0400, "tm" <noone(a)msc.com> wrote: > >> >>"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message >>news:35po06tdq5g8shn21k3n9pto73i5vm3vjf(a)4ax.com... >>> On Sun, 6 Jun 2010 18:05:57 +0100, "john jardine" >>> <zen177928(a)zen.co.uk> wrote: >>> >>>> >>>>"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) >>>> >>> >>> >>> Here's my ship's fog bell generator, as I remember it. The decay was >>> set by tapering off the supply voltage to 4 or maybe 5 LC oscillators, >>> so Q didn't matter. It sounded pretty good. >>> >>> ftp://jjlarkin.lmi.net/Ships_Bell.JPG >>> >>> A refinement would be to have a separate decay rate for each >>> oscillator, since some harmonics of a real bell fade at different >>> rates from others. >>> >>> Yikes, I remember thousands of schematics but can never recall where I >>> left my glasses. >>> >>> John >>> >>> >> >>In a like request, how about a GQ alarm? >> >>I restored a GQ generator on a WW2 sub that used a geared motor to >>trigger a damped oscillator with mechanical contacts. Of course it was all >>tubes. >> >>T >> > >The fog bell circuit I did replaced a Henschel unit that actually >whacked a metal bar with a solenoid and picked up the result with a >magnetic pickup coil. It sounded pretty ratty. > >John Years and years ago I did an analog "Warning Chime/CPU Monitor for Automotive Applications", which provided CPU POR functions and chime/alarm sounds in GM products. The chime sound was cleaner than the original bar "clacker". ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy
From: tm on 7 Jun 2010 12:07 "Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote in message news:as5q06lfrb18da77fdrt9t2tv7alfjujpg(a)4ax.com... > On Mon, 07 Jun 2010 08:19:42 -0700, John Larkin > <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Mon, 7 Jun 2010 00:51:57 -0400, "tm" <noone(a)msc.com> wrote: >> >>> >>>"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in >>>message >>>news:35po06tdq5g8shn21k3n9pto73i5vm3vjf(a)4ax.com... >>>> On Sun, 6 Jun 2010 18:05:57 +0100, "john jardine" >>>> <zen177928(a)zen.co.uk> wrote: >>>> >>>>> >>>>>"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) >>>>> >>>> >>>> >>>> Here's my ship's fog bell generator, as I remember it. The decay was >>>> set by tapering off the supply voltage to 4 or maybe 5 LC oscillators, >>>> so Q didn't matter. It sounded pretty good. >>>> >>>> ftp://jjlarkin.lmi.net/Ships_Bell.JPG >>>> >>>> A refinement would be to have a separate decay rate for each >>>> oscillator, since some harmonics of a real bell fade at different >>>> rates from others. >>>> >>>> Yikes, I remember thousands of schematics but can never recall where I >>>> left my glasses. >>>> >>>> John >>>> >>>> >>> >>>In a like request, how about a GQ alarm? >>> >>>I restored a GQ generator on a WW2 sub that used a geared motor to >>>trigger a damped oscillator with mechanical contacts. Of course it was >>>all >>>tubes. >>> >>>T >>> >> >>The fog bell circuit I did replaced a Henschel unit that actually >>whacked a metal bar with a solenoid and picked up the result with a >>magnetic pickup coil. It sounded pretty ratty. >> >>John > > Years and years ago I did an analog "Warning Chime/CPU Monitor for > Automotive Applications", which provided CPU POR functions and > chime/alarm sounds in GM products. The chime sound was cleaner than > the original bar "clacker". > This is the one I repaired many years ago. Others now keep it working. http://www.policeinterceptor.com/sounds/423gq.wav I'd like to have it as a ring tone somehow. Tom
From: John Fields on 7 Jun 2010 12:50
On Mon, 07 Jun 2010 06:47:45 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Mon, 07 Jun 2010 06:47:07 -0500, John Fields ><jfields(a)austininstruments.com> wrote: > >>On Sun, 06 Jun 2010 20:24:00 -0700, John Larkin >><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Sun, 6 Jun 2010 18:05:57 +0100, "john jardine" >>><zen177928(a)zen.co.uk> wrote: >>> >>>> >>>>"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) >>>> >>> >>> >>>Here's my ship's fog bell generator, as I remember it. The decay was >>>set by tapering off the supply voltage to 4 or maybe 5 LC oscillators, >>>so Q didn't matter. It sounded pretty good. >>> >>>ftp://jjlarkin.lmi.net/Ships_Bell.JPG >>> >>>A refinement would be to have a separate decay rate for each >>>oscillator, since some harmonics of a real bell fade at different >>>rates from others. >>> >>>Yikes, I remember thousands of schematics but can never recall where I >>>left my glasses. >> >>--- >>Apparently, since what he asked for was a: "single transistor >>circuit". ;) >> >>JF > >This is a discussion group, --- Excellent! I see that your usual remarkable grasp of the obvious is still flying unfettered. --- >and the subject was circuits that simulate >bells. --- Sorry, but no. The subject was: "Twin T circuit wanted", while the body of the message read: "Can someone supply a single transistor circuit that will give a damped sine wave when a pulse is applied? to emulate a bell sound". You posted neither a twin tee circuit nor a single transistor circuit, but rather something so that you could pat yourself on the back regardless of the OP's request. --- >You posted none. Why is that? --- I chose not to, but to criticise you instead. --- >A single-oscillator version of my thing doesn't sound as good, but it >is sort of bell-like. --- OK, but then there's still the question of the two-transistor capacitor charger-upper and whether or not it's part of the circuit, but I'm sure you'll get around that somehow. Then, of course, the poor OP's got to figure out the transformers and the values of all the components, but that's OK since you're just throwing out ideas, not designs, eh? --- >It's a cinch you're not going to simulate 5 >damped oscillation modes with one trensistor. [1] >Show us your single-transistor bell simulator circuit. --- All in due course, if I choose to, but it seems that John Jardine has already done a nice job of it, so why should I accept your invitation to a sissing contest? --- >John > >[1] the original touch-tone telephone managed to make >controlled-amplitude DTMF tone pairs from a single transistor, sort of >defying conventional wisdom about oscillator modes. --- All well and good, but what does that have to do with generating bell-like tones? |