 |
Search Sci.Electronics.Basics |
|
|
|
|
|
|
 |
|
|
Sci.Electronics.Basics -> volume control for clock
There are 7 messages in this thread.
You are currently looking at messages 1 to 7.
|
Author: SocratesDate: 20:19 20-05-08
|
|
Hello,
I have an electronic quartz clock with chimes that needs a volume control.
It has a 2 1/4 speaker and is way too loud for the room it is in. Is there
any place that makes a inline volume control that I might be able to use to
adjust this so it wouldn't be so loud. Please reply to the group.
Thanks, Marty
|
|
|
|
Author: Lord GarthDate: 20:31 20-05-08
|
|
"Socrates" <news@locutus.org> wrote in message
news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
> Hello,
> I have an electronic quartz clock with chimes that needs a volume control.
> It has a 2 1/4 speaker and is way too loud for the room it is in. Is
> there any place that makes a inline volume control that I might be able to
> use to adjust this so it wouldn't be so loud. Please reply to the group.
> Thanks, Marty
>
Place a variable resistor in parallel with the speaker and adjust until you
get a
reasonable volume. You can then replace the variable resistor with a fix
resistor of similar value.
|
|
|
|
|
|
On Tue, 20 May 2008, Lord Garth wrote:
>
"Socrates" <news@locutus.org> wrote in message
> news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
>> Hello,
>> I have an electronic quartz clock with chimes that needs a volume control.
>> It has a 2 1/4 speaker and is way too loud for the room it is in. Is
>> there any place that makes a inline volume control that I might be able to
>> use to adjust this so it wouldn't be so loud. Please reply to the group.
>> Thanks, Marty
>>
>
> Place a variable resistor in parallel with the speaker and adjust until you
> get a
> reasonable volume. You can then replace the variable resistor with a fix
> resistor of similar value.
>
If it's merely a clock, chanced are good that it's a piezoelectric
transducer, ie quite high impedance. So he may need to start with
quite a high value of resistor.
Michael
|
|
|
|
Author: Lord GarthDate: 20:52 20-05-08
|
|
"Michael Black" <et472@ncf.ca> wrote in message
news:Pine.LNX.4.64.0805202044150.10671@darkstar.example.org...
> On Tue, 20 May 2008, Lord Garth wrote:
>
>>
> "Socrates" <news@locutus.org> wrote in message
>> news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
>>> Hello,
>>> I have an electronic quartz clock with chimes that needs a volume
>>> control.
>>> It has a 2 1/4 speaker and is way too loud for the room it is in. Is
>>> there any place that makes a inline volume control that I might be able
>>> to
>>> use to adjust this so it wouldn't be so loud. Please reply to the
>>> group.
>>> Thanks, Marty
>>>
>>
>> Place a variable resistor in parallel with the speaker and adjust until
>> you
>> get a
>> reasonable volume. You can then replace the variable resistor with a fix
>> resistor of similar value.
>>
> If it's merely a clock, chanced are good that it's a piezoelectric
> transducer, ie quite high impedance. So he may need to start with
> quite a high value of resistor.
>
> Michael
He said 2.25" speaker so maybe not!
|
|
|
|
|
|
On Tue, 20 May 2008, Lord Garth wrote:
>
"Michael Black" <et472@ncf.ca> wrote in message
> news:Pine.LNX.4.64.0805202044150.10671@darkstar.example.org...
>> On Tue, 20 May 2008, Lord Garth wrote:
>>
>>>
>> "Socrates" <news@locutus.org> wrote in message
>>> news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
>>>> Hello,
>>>> I have an electronic quartz clock with chimes that needs a volume
>>>> control.
>>>> It has a 2 1/4 speaker and is way too loud for the room it is in. Is
>>>> there any place that makes a inline volume control that I might be able
>>>> to
>>>> use to adjust this so it wouldn't be so loud. Please reply to the
>>>> group.
>>>> Thanks, Marty
>>>>
>>>
>>> Place a variable resistor in parallel with the speaker and adjust until
>>> you
>>> get a
>>> reasonable volume. You can then replace the variable resistor with a fix
>>> resistor of similar value.
>>>
>> If it's merely a clock, chanced are good that it's a piezoelectric
>> transducer, ie quite high impedance. So he may need to start with
>> quite a high value of resistor.
>>
>> Michael
>
> He said 2.25" speaker so maybe not!
>
He did, I missed that.
It seems odd though, because in a straight alarm clock (as opposed to
a clock radio) all the ones I've looked at use a piezoelectric transducer.
Michael
|
|
|
|
Author: John FieldsDate: 09:23 21-05-08
|
|
On Tue, 20 May 2008 19:31:15 -0500, "Lord Garth" <lgarth@tantalus.net>
wrote:
>
>"Socrates" <news@locutus.org> wrote in message
>news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
>> Hello,
>> I have an electronic quartz clock with chimes that needs a volume control.
>> It has a 2 1/4 speaker and is way too loud for the room it is in. Is
>> there any place that makes a inline volume control that I might be able to
>> use to adjust this so it wouldn't be so loud. Please reply to the group.
>> Thanks, Marty
>>
>
>Place a variable resistor in parallel with the speaker and adjust until you
>get a
>reasonable volume. You can then replace the variable resistor with a fix
>resistor of similar value.
---
Not a good idea since the driver may be overloaded by the lower
impedance of the speaker-resistor combination.
A better way would be be to keep the load impedance constant while
attenuating the input to the speaker, like this: (View in Courier)
VOUT>----[R1]--+-----+
| |
[R2] [ZL]
| |
GND>-----------+-----+
where:
R1 + (R2||ZL) = ZL
JF
|
|
|
|
Author: Lord GarthDate: 15:27 21-05-08
|
|
"Michael Black" <et472@ncf.ca> wrote in message
news:Pine.LNX.4.64.0805202258340.10816@darkstar.example.org...
> On Tue, 20 May 2008, Lord Garth wrote:
>
>>
> "Michael Black" <et472@ncf.ca> wrote in message
>> news:Pine.LNX.4.64.0805202044150.10671@darkstar.example.org...
>>> On Tue, 20 May 2008, Lord Garth wrote:
>>>
>>>>
>>> "Socrates" <news@locutus.org> wrote in message
>>>> news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
>>>>> Hello,
>>>>> I have an electronic quartz clock with chimes that needs a volume
>>>>> control.
>>>>> It has a 2 1/4 speaker and is way too loud for the room it is in.
Is
>>>>> there any place that makes a inline volume control that I might be
>>>>> able
>>>>> to
>>>>> use to adjust this so it wouldn't be so loud. Please reply to the
>>>>> group.
>>>>> Thanks, Marty
>>>>>
>>>>
>>>> Place a variable resistor in parallel with the speaker and adjust until
>>>> you
>>>> get a
>>>> reasonable volume. You can then replace the variable resistor with a
>>>> fix
>>>> resistor of similar value.
>>>>
>>> If it's merely a clock, chanced are good that it's a piezoelectric
>>> transducer, ie quite high impedance. So he may need to start with
>>> quite a high value of resistor.
>>>
>>> Michael
>>
>> He said 2.25" speaker so maybe not!
>>
> He did, I missed that.
>
> It seems odd though, because in a straight alarm clock (as opposed to
> a clock radio) all the ones I've looked at use a piezoelectric transducer.
>
>
> Michael
>
I'd agree, it seem that only clock radios still use a speaker for the alarm.
I do like John's approach to balance the load impedance however. This
is an L pad.
|
|
|
|
1 |
|
|
|
|
Contact | Electronic Portal
|
|
|
