I got this, but saw no polarity markings like my other larger piezo buzzer.
Andy
Piezo Transducer
Electrical Specifications:
Rated Voltage: 5Vp-p
Rated Current: 2mA (max)
Sound Output at 10cm: 85 dBA
Resonant Frequency: 2.04kHz
Dimensions: 8.43mm H x 12.1mm diameter
Number of pins: 2
Pitch: 6.5mm
Lead thickness: 0.62mm
PC mount
Markings: 12RT04CC
Piezo buzzer - no polarity marks
Started by ●May 20, 2019
Reply by ●May 20, 20192019-05-20
On 2019-05-20 21:20, AK wrote:> I got this, but saw no polarity markings like my other larger piezo buzzer. > > Andy > > Piezo Transducer > Electrical Specifications: > > Rated Voltage: 5Vp-p > Rated Current: 2mA (max) > Sound Output at 10cm: 85 dBA > Resonant Frequency: 2.04kHz > Dimensions: 8.43mm H x 12.1mm diameter > Number of pins: 2 > Pitch: 6.5mm > Lead thickness: 0.62mm > PC mount > Markings: 12RT04CC >It expects to be driven by an alternating voltage. If you connect it to a DC source, a battery for example, it will just go *tick!*. Jeroen Belleman
Reply by ●May 20, 20192019-05-20
On Mon, 20 May 2019 12:20:32 -0700 (PDT), AK <scientist77017@gmail.com> wrote:>I got this, but saw no polarity markings like my other larger piezo buzzer. > >Andy > >Piezo Transducer >Electrical Specifications: > > Rated Voltage: 5Vp-p > Rated Current: 2mA (max) > Sound Output at 10cm: 85 dBA > Resonant Frequency: 2.04kHz > Dimensions: 8.43mm H x 12.1mm diameter > Number of pins: 2 > Pitch: 6.5mm > Lead thickness: 0.62mm > PC mount > Markings: 12RT04CCIt is not a buzzer, it is a transducer. A transducer is a device that can convert (in this case) sound to electricity or electricity to sound. To use that as a buzzer you will need to drive it with an oscillator, at 2.04 kilo hertz and a wave with a 5 volt peak to peak amplitude (to get the maximum noise out of it) It doesn't have the polarity indicated because it has no polarity. Think of it as a loudspeaker (another transducer since they can be used as microphones and convert sound to electricity) It will work at other frequencies with less volume. It should click when you put a battery on the leads, and click again when you reverse the polarity of the battery. (it also stores a charge like a capacitor) Look up oscillators if you want to use it as a buzzer. The 555 makes a dandy oscillator.
Reply by ●May 20, 20192019-05-20
On Monday, May 20, 2019 at 4:48:52 PM UTC-5, default wrote:> On Mon, 20 May 2019 12:20:32 -0700 (PDT), AK > <scientist77017@gmail.com> wrote: > > >I got this, but saw no polarity markings like my other larger piezo buzzer. > > > >Andy > > > >Piezo Transducer > >Electrical Specifications: > > > > Rated Voltage: 5Vp-p > > Rated Current: 2mA (max) > > Sound Output at 10cm: 85 dBA > > Resonant Frequency: 2.04kHz > > Dimensions: 8.43mm H x 12.1mm diameter > > Number of pins: 2 > > Pitch: 6.5mm > > Lead thickness: 0.62mm > > PC mount > > Markings: 12RT04CC > > It is not a buzzer, it is a transducer. > > A transducer is a device that can convert (in this case) sound to > electricity or electricity to sound. To use that as a buzzer you will > need to drive it with an oscillator, at 2.04 kilo hertz and a wave > with a 5 volt peak to peak amplitude (to get the maximum noise out of > it) > > It doesn't have the polarity indicated because it has no polarity. > Think of it as a loudspeaker (another transducer since they can be > used as microphones and convert sound to electricity) > > It will work at other frequencies with less volume. It should click > when you put a battery on the leads, and click again when you reverse > the polarity of the battery. (it also stores a charge like a > capacitor) > > Look up oscillators if you want to use it as a buzzer. The 555 makes > a dandy oscillator.Ok. I want to replace the current piezo buzzer I have with something that will fit on my breadboard. It's a pulse type which I do not like. Andy
Reply by ●May 21, 20192019-05-21
On Mon, 20 May 2019 18:04:36 -0700 (PDT), AK <scientist77017@gmail.com> wrote:>On Monday, May 20, 2019 at 4:48:52 PM UTC-5, default wrote: >> On Mon, 20 May 2019 12:20:32 -0700 (PDT), AK >> <scientist77017@gmail.com> wrote: >> >> >I got this, but saw no polarity markings like my other larger piezo buzzer. >> > >> >Andy >> > >> >Piezo Transducer >> >Electrical Specifications: >> > >> > Rated Voltage: 5Vp-p >> > Rated Current: 2mA (max) >> > Sound Output at 10cm: 85 dBA >> > Resonant Frequency: 2.04kHz >> > Dimensions: 8.43mm H x 12.1mm diameter >> > Number of pins: 2 >> > Pitch: 6.5mm >> > Lead thickness: 0.62mm >> > PC mount >> > Markings: 12RT04CC >> >> It is not a buzzer, it is a transducer. >> >> A transducer is a device that can convert (in this case) sound to >> electricity or electricity to sound. To use that as a buzzer you will >> need to drive it with an oscillator, at 2.04 kilo hertz and a wave >> with a 5 volt peak to peak amplitude (to get the maximum noise out of >> it) >> >> It doesn't have the polarity indicated because it has no polarity. >> Think of it as a loudspeaker (another transducer since they can be >> used as microphones and convert sound to electricity) >> >> It will work at other frequencies with less volume. It should click >> when you put a battery on the leads, and click again when you reverse >> the polarity of the battery. (it also stores a charge like a >> capacitor) >> >> Look up oscillators if you want to use it as a buzzer. The 555 makes >> a dandy oscillator. > >Ok. I want to replace the current piezo buzzer I have with something that will fit on my breadboard. > >It's a pulse type which I do not like. > >AndyI like bells myself. I cut a chime bar from some hard aluminum alloy and used a solenoid to pull down on a mallet to strike the bar. It sounded bad (with all the mechanical noise the solenoid made) and I ended up using a 555 as a monostable timer to get just the right timing on the stroke of the mallet. I hate piezo buzzers. Even a speaker driven with a 555 sounds better to me.
Reply by ●May 21, 20192019-05-21
On Monday, May 20, 2019 at 10:04:35 PM UTC-5, default wrote:> On Mon, 20 May 2019 18:04:36 -0700 (PDT), AK > <scientist77017@gmail.com> wrote: > > >On Monday, May 20, 2019 at 4:48:52 PM UTC-5, default wrote: > >> On Mon, 20 May 2019 12:20:32 -0700 (PDT), AK > >> <scientist77017@gmail.com> wrote: > >> > >> >I got this, but saw no polarity markings like my other larger piezo buzzer. > >> > > >> >Andy > >> > > >> >Piezo Transducer > >> >Electrical Specifications: > >> > > >> > Rated Voltage: 5Vp-p > >> > Rated Current: 2mA (max) > >> > Sound Output at 10cm: 85 dBA > >> > Resonant Frequency: 2.04kHz > >> > Dimensions: 8.43mm H x 12.1mm diameter > >> > Number of pins: 2 > >> > Pitch: 6.5mm > >> > Lead thickness: 0.62mm > >> > PC mount > >> > Markings: 12RT04CC > >> > >> It is not a buzzer, it is a transducer. > >> > >> A transducer is a device that can convert (in this case) sound to > >> electricity or electricity to sound. To use that as a buzzer you will > >> need to drive it with an oscillator, at 2.04 kilo hertz and a wave > >> with a 5 volt peak to peak amplitude (to get the maximum noise out of > >> it) > >> > >> It doesn't have the polarity indicated because it has no polarity. > >> Think of it as a loudspeaker (another transducer since they can be > >> used as microphones and convert sound to electricity) > >> > >> It will work at other frequencies with less volume. It should click > >> when you put a battery on the leads, and click again when you reverse > >> the polarity of the battery. (it also stores a charge like a > >> capacitor) > >> > >> Look up oscillators if you want to use it as a buzzer. The 555 makes > >> a dandy oscillator. > > > >Ok. I want to replace the current piezo buzzer I have with something that will fit on my breadboard. > > > >It's a pulse type which I do not like. > > > >Andy > > I like bells myself. I cut a chime bar from some hard aluminum alloy > and used a solenoid to pull down on a mallet to strike the bar. It > sounded bad (with all the mechanical noise the solenoid made) and I > ended up using a 555 as a monostable timer to get just the right > timing on the stroke of the mallet. > > I hate piezo buzzers. Even a speaker driven with a 555 sounds better > to me.What specs do I need to look for the speaker? My circuit runs from 9 vdc. Andy
Reply by ●May 22, 20192019-05-22
On Tue, 21 May 2019 19:33:42 -0700 (PDT), AK <scientist77017@gmail.com> wrote:>On Monday, May 20, 2019 at 10:04:35 PM UTC-5, default wrote: >> On Mon, 20 May 2019 18:04:36 -0700 (PDT), AK >> <scientist77017@gmail.com> wrote: >> >> >On Monday, May 20, 2019 at 4:48:52 PM UTC-5, default wrote: >> >> On Mon, 20 May 2019 12:20:32 -0700 (PDT), AK >> >> <scientist77017@gmail.com> wrote: >> >> >> >> >I got this, but saw no polarity markings like my other larger piezo buzzer. >> >> > >> >> >Andy >> >> > >> >> >Piezo Transducer >> >> >Electrical Specifications: >> >> > >> >> > Rated Voltage: 5Vp-p >> >> > Rated Current: 2mA (max) >> >> > Sound Output at 10cm: 85 dBA >> >> > Resonant Frequency: 2.04kHz >> >> > Dimensions: 8.43mm H x 12.1mm diameter >> >> > Number of pins: 2 >> >> > Pitch: 6.5mm >> >> > Lead thickness: 0.62mm >> >> > PC mount >> >> > Markings: 12RT04CC >> >> >> >> It is not a buzzer, it is a transducer. >> >> >> >> A transducer is a device that can convert (in this case) sound to >> >> electricity or electricity to sound. To use that as a buzzer you will >> >> need to drive it with an oscillator, at 2.04 kilo hertz and a wave >> >> with a 5 volt peak to peak amplitude (to get the maximum noise out of >> >> it) >> >> >> >> It doesn't have the polarity indicated because it has no polarity. >> >> Think of it as a loudspeaker (another transducer since they can be >> >> used as microphones and convert sound to electricity) >> >> >> >> It will work at other frequencies with less volume. It should click >> >> when you put a battery on the leads, and click again when you reverse >> >> the polarity of the battery. (it also stores a charge like a >> >> capacitor) >> >> >> >> Look up oscillators if you want to use it as a buzzer. The 555 makes >> >> a dandy oscillator. >> > >> >Ok. I want to replace the current piezo buzzer I have with something that will fit on my breadboard. >> > >> >It's a pulse type which I do not like. >> > >> >Andy >> >> I like bells myself. I cut a chime bar from some hard aluminum alloy >> and used a solenoid to pull down on a mallet to strike the bar. It >> sounded bad (with all the mechanical noise the solenoid made) and I >> ended up using a 555 as a monostable timer to get just the right >> timing on the stroke of the mallet. >> >> I hate piezo buzzers. Even a speaker driven with a 555 sounds better >> to me. > >What specs do I need to look for the speaker? > >My circuit runs from 9 vdc. > >AndyAny small speaker should work. There's dozens of paper cone speakers in a 2-3" size that make good annunciators. If you have a junk radio you can cannibalize a speaker from it. I'd use 8 ohms or higher would be my choice if I was buying one. You would also need/want an electrolytic cap of 10-100 uf to use in series with it to keep DC off the speaker. http://www.circuitdiagram.org/morse-code-practice-oscillator-using-555.html http://www.cranburyscouts.org/ElecOsc.htm http://www.circuitdb.com/?p=254
Reply by ●May 22, 20192019-05-22
On Wednesday, May 22, 2019 at 5:11:37 AM UTC-5, default wrote:> On Tue, 21 May 2019 19:33:42 -0700 (PDT), AK > <scientist77017@gmail.com> wrote: > > >On Monday, May 20, 2019 at 10:04:35 PM UTC-5, default wrote: > >> On Mon, 20 May 2019 18:04:36 -0700 (PDT), AK > >> <scientist77017@gmail.com> wrote: > >> > >> >On Monday, May 20, 2019 at 4:48:52 PM UTC-5, default wrote: > >> >> On Mon, 20 May 2019 12:20:32 -0700 (PDT), AK > >> >> <scientist77017@gmail.com> wrote: > >> >> > >> >> >I got this, but saw no polarity markings like my other larger piezo buzzer. > >> >> > > >> >> >Andy > >> >> > > >> >> >Piezo Transducer > >> >> >Electrical Specifications: > >> >> > > >> >> > Rated Voltage: 5Vp-p > >> >> > Rated Current: 2mA (max) > >> >> > Sound Output at 10cm: 85 dBA > >> >> > Resonant Frequency: 2.04kHz > >> >> > Dimensions: 8.43mm H x 12.1mm diameter > >> >> > Number of pins: 2 > >> >> > Pitch: 6.5mm > >> >> > Lead thickness: 0.62mm > >> >> > PC mount > >> >> > Markings: 12RT04CC > >> >> > >> >> It is not a buzzer, it is a transducer. > >> >> > >> >> A transducer is a device that can convert (in this case) sound to > >> >> electricity or electricity to sound. To use that as a buzzer you will > >> >> need to drive it with an oscillator, at 2.04 kilo hertz and a wave > >> >> with a 5 volt peak to peak amplitude (to get the maximum noise out of > >> >> it) > >> >> > >> >> It doesn't have the polarity indicated because it has no polarity. > >> >> Think of it as a loudspeaker (another transducer since they can be > >> >> used as microphones and convert sound to electricity) > >> >> > >> >> It will work at other frequencies with less volume. It should click > >> >> when you put a battery on the leads, and click again when you reverse > >> >> the polarity of the battery. (it also stores a charge like a > >> >> capacitor) > >> >> > >> >> Look up oscillators if you want to use it as a buzzer. The 555 makes > >> >> a dandy oscillator. > >> > > >> >Ok. I want to replace the current piezo buzzer I have with something that will fit on my breadboard. > >> > > >> >It's a pulse type which I do not like. > >> > > >> >Andy > >> > >> I like bells myself. I cut a chime bar from some hard aluminum alloy > >> and used a solenoid to pull down on a mallet to strike the bar. It > >> sounded bad (with all the mechanical noise the solenoid made) and I > >> ended up using a 555 as a monostable timer to get just the right > >> timing on the stroke of the mallet. > >> > >> I hate piezo buzzers. Even a speaker driven with a 555 sounds better > >> to me. > > > >What specs do I need to look for the speaker? > > > >My circuit runs from 9 vdc. > > > >Andy > Any small speaker should work. There's dozens of paper cone speakers > in a 2-3" size that make good annunciators. If you have a junk radio > you can cannibalize a speaker from it. I'd use 8 ohms or higher would > be my choice if I was buying one. You would also need/want an > electrolytic cap of 10-100 uf to use in series with it to keep DC off > the speaker. > > http://www.circuitdiagram.org/morse-code-practice-oscillator-using-555.html > http://www.cranburyscouts.org/ElecOsc.htm > http://www.circuitdb.com/?p=254Thanks.
