On Mon, 31 Oct 2016 21:36:23 +1000, <tabbypurr@gmail.com> wrote:
> On Sunday, 30 October 2016 23:55:44 UTC, David Eather wrote:
>> >>> On 27/10/2016 22:22, boB wrote:
>
>> >>>> This part, an 8 pin bridgable 1W audio amplifier with volume
>> control
>> >>>> input is going obsolete and last order date is end of this year.
>> >>>>
>> >>>> When I designed it in around 10 years ago they were old then but
>> >>>> plenty available. We will eventually need to design in a
>> replacement.
>
>> I feel dirty just for saying this... LM380?
>
> from the days of QIL IIRC. When 0.1" spacing was too tight.
>
>
> NT
a 14 or 16 pin PDIP
Reply by ●October 31, 20162016-10-31
On Sunday, 30 October 2016 23:55:44 UTC, David Eather wrote:
> >>> On 27/10/2016 22:22, boB wrote:
> >>>> This part, an 8 pin bridgable 1W audio amplifier with volume control
> >>>> input is going obsolete and last order date is end of this year.
> >>>>
> >>>> When I designed it in around 10 years ago they were old then but
> >>>> plenty available. We will eventually need to design in a replacement.
> I feel dirty just for saying this... LM380?
from the days of QIL IIRC. When 0.1" spacing was too tight.
NT
Reply by David Eather●October 30, 20162016-10-30
On Sun, 30 Oct 2016 17:50:31 +1000, boB <boB@theresnoplacelikehome.com>
wrote:
> On Sun, 30 Oct 2016 10:23:15 +1000, "David Eather" <eather@tpg.com.au>
> wrote:
>
>> On Fri, 28 Oct 2016 09:00:01 +1000, TTman <pcw1.cad@ntlworld.com> wrote:
>>
>>> On 27/10/2016 22:22, boB wrote:
>>>>
>>>>
>>>>
>>>> This part, an 8 pin bridgable 1W audio amplifier with volume control
>>>> input is going obsolete and last order date is end of this year.
>>>>
>>>> When I designed it in around 10 years ago they were old then but
>>>> plenty available. We will eventually need to design in a replacement.
>>>>
>>>> We are running these at around 9V VCC and they work great into a small
>>>> speaker. 8 Ohms I believe.
>>>>
>>>> We also use the volume control input... +40 dB gain down to -60 or 80
>>>> dB gain. Doesn't require that much gain necessarily.
>>>>
>>>> There is the old National/TI LM386-4 that I just now heard is going
>>>> obsolete ! Dang. It looked like it was going to work.
>>>>
>>>> Could go discreet with op-amp and SOT-23s but still wouldn't have the
>>>> volume/gain control pin without adding a Jfet or something and would
>>>> take up valuable space on one of the existing products.
>>>>
>>>> Any suggestions ?
>>>>
>>>> Thanks,
>>>> boB
>>>> K7IQ
>>>>
>>>>
>>>> http://www.nxp.com/documents/data_sheet/TDA7052A_AT.pdf
>>>>
>>>> 1 W BTL mono audio amplifier with DC volume control TDA7052A/AT
>>>>
>>> I had the same problem.... switched to the SOIC8 version . You can just
>>> about solder across the dil pads as an interim solution. I guess I'll
>>> be
>>> looking for a solution too. Maybe I'll have to bulk buy. :(
>>>
>>> ---
>>> This email has been checked for viruses by Avast antivirus software.
>>> https://www.avast.com/antivirus
>>>
>>
>> http://media.digikey.com/pdf/Data%20Sheets/Panasonic%20Semiconductors%20ICs%20PDFs/AN7511.pdf
>
> Perfect ! Thanks ! But it looks like this one AN7511 is obsolete
> too. Darn. It would have been perfect !
Dooh!
>
> I could also use a small class-D amplifier of small power rating.
>
> I found a 10 watt one I think it was (5V Vcc max I think) but it also
> requires an output LC which would be fine but it takes more space.
> And it didn't have a Volume/gain adjustment input.
>
> I'm open if it does't take up too much space and hopefully runs on
> 9-ish volts.
>
> boB
I feel dirty just for saying this... LM380?
Reply by boB●October 30, 20162016-10-30
On Sun, 30 Oct 2016 10:23:15 +1000, "David Eather" <eather@tpg.com.au>
wrote:
>On Fri, 28 Oct 2016 09:00:01 +1000, TTman <pcw1.cad@ntlworld.com> wrote:
>
>> On 27/10/2016 22:22, boB wrote:
>>>
>>>
>>>
>>> This part, an 8 pin bridgable 1W audio amplifier with volume control
>>> input is going obsolete and last order date is end of this year.
>>>
>>> When I designed it in around 10 years ago they were old then but
>>> plenty available. We will eventually need to design in a replacement.
>>>
>>> We are running these at around 9V VCC and they work great into a small
>>> speaker. 8 Ohms I believe.
>>>
>>> We also use the volume control input... +40 dB gain down to -60 or 80
>>> dB gain. Doesn't require that much gain necessarily.
>>>
>>> There is the old National/TI LM386-4 that I just now heard is going
>>> obsolete ! Dang. It looked like it was going to work.
>>>
>>> Could go discreet with op-amp and SOT-23s but still wouldn't have the
>>> volume/gain control pin without adding a Jfet or something and would
>>> take up valuable space on one of the existing products.
>>>
>>> Any suggestions ?
>>>
>>> Thanks,
>>> boB
>>> K7IQ
>>>
>>>
>>> http://www.nxp.com/documents/data_sheet/TDA7052A_AT.pdf
>>>
>>> 1 W BTL mono audio amplifier with DC volume control TDA7052A/AT
>>>
>> I had the same problem.... switched to the SOIC8 version . You can just
>> about solder across the dil pads as an interim solution. I guess I'll be
>> looking for a solution too. Maybe I'll have to bulk buy. :(
>>
>> ---
>> This email has been checked for viruses by Avast antivirus software.
>> https://www.avast.com/antivirus
>>
>
>http://media.digikey.com/pdf/Data%20Sheets/Panasonic%20Semiconductors%20ICs%20PDFs/AN7511.pdf
Perfect ! Thanks ! But it looks like this one AN7511 is obsolete
too. Darn. It would have been perfect !
I could also use a small class-D amplifier of small power rating.
I found a 10 watt one I think it was (5V Vcc max I think) but it also
requires an output LC which would be fine but it takes more space.
And it didn't have a Volume/gain adjustment input.
I'm open if it does't take up too much space and hopefully runs on
9-ish volts.
boB
Reply by David Eather●October 29, 20162016-10-29
On Fri, 28 Oct 2016 09:00:01 +1000, TTman <pcw1.cad@ntlworld.com> wrote:
> On 27/10/2016 22:22, boB wrote:
>>
>>
>>
>> This part, an 8 pin bridgable 1W audio amplifier with volume control
>> input is going obsolete and last order date is end of this year.
>>
>> When I designed it in around 10 years ago they were old then but
>> plenty available. We will eventually need to design in a replacement.
>>
>> We are running these at around 9V VCC and they work great into a small
>> speaker. 8 Ohms I believe.
>>
>> We also use the volume control input... +40 dB gain down to -60 or 80
>> dB gain. Doesn't require that much gain necessarily.
>>
>> There is the old National/TI LM386-4 that I just now heard is going
>> obsolete ! Dang. It looked like it was going to work.
>>
>> Could go discreet with op-amp and SOT-23s but still wouldn't have the
>> volume/gain control pin without adding a Jfet or something and would
>> take up valuable space on one of the existing products.
>>
>> Any suggestions ?
>>
>> Thanks,
>> boB
>> K7IQ
>>
>>
>> http://www.nxp.com/documents/data_sheet/TDA7052A_AT.pdf
>>
>> 1 W BTL mono audio amplifier with DC volume control TDA7052A/AT
>>
> I had the same problem.... switched to the SOIC8 version . You can just
> about solder across the dil pads as an interim solution. I guess I'll be
> looking for a solution too. Maybe I'll have to bulk buy. :(
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
On Sat, 29 Oct 2016 10:08:09 -0700 (PDT), tabbypurr@gmail.com wrote:
>On Friday, 28 October 2016 12:31:41 UTC+1, Rob wrote:
>> boB <boB@theresnoplacelikehome.com> wrote:
>
>> > It ~may~ actually be (hopefully) that the LM386-4 (the 1 watt
>> > part) isn't going away... That is what I had heard though through the
>> > grapevine and the internet which is always true of course. Nothing
>> > official actually so there is a ray of hope, maybe.
>>
>> One would think that components like the LM386 would never go away...
>
>+1, they are used so widely, they're the go-to rock bottom audio amp chip. I don't see it making business sense to stop production. Only use it if you want crappy sound.
>
>
>NT
Luckily this 1W amplifier is only used for voice and a small speaker.
A couple percent THD won't harm anything. Might even help to sound
"louder" ?
boB
Reply by ●October 29, 20162016-10-29
On Friday, 28 October 2016 12:31:41 UTC+1, Rob wrote:
> boB <boB@theresnoplacelikehome.com> wrote:
> > It ~may~ actually be (hopefully) that the LM386-4 (the 1 watt
> > part) isn't going away... That is what I had heard though through the
> > grapevine and the internet which is always true of course. Nothing
> > official actually so there is a ray of hope, maybe.
>
> One would think that components like the LM386 would never go away...
+1, they are used so widely, they're the go-to rock bottom audio amp chip. I don't see it making business sense to stop production. Only use it if you want crappy sound.
NT
Reply by TTman●October 28, 20162016-10-28
>
> Thanks TT...
> We are going to have to do a bulk buy as well. End of 2016 is it.
> There are quite a few at distrubuters and I think we have almost
> 10,000 now but will need to substitute something. They were the
> perfect parts and cheap... 32 cents each. I was ready to design in
> the LM386-4 which has a gain control but NOW they're life is going to
> be short lived as well.
>
> There's gotta be some asian part I would think ? TV sets and all
> that. Might all be Class D. Actually I found a Class D chip but no
> volume/gain control. Would have to add at least that J-FET to the
> circuit which isn't the end of the world BUT it takes up space.
>
> Will stay tuned.
> boB
>
TI do a part that's good to go class D, but Vcc is 5.2V max :(
I'd have to put in another 5V reg as our TDA runs off a 2 cell lipo
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
Reply by George Herold●October 28, 20162016-10-28
On Thursday, October 27, 2016 at 7:28:28 PM UTC-4, boB wrote:
> On Fri, 28 Oct 2016 00:00:01 +0100, TTman <pcw1.cad@ntlworld.com>
> wrote:
>
> >On 27/10/2016 22:22, boB wrote:
> >>
> >>
> >>
> >> This part, an 8 pin bridgable 1W audio amplifier with volume control
> >> input is going obsolete and last order date is end of this year.
> >>
> >> When I designed it in around 10 years ago they were old then but
> >> plenty available. We will eventually need to design in a replacement.
> >>
> >> We are running these at around 9V VCC and they work great into a small
> >> speaker. 8 Ohms I believe.
> >>
> >> We also use the volume control input... +40 dB gain down to -60 or 80
> >> dB gain. Doesn't require that much gain necessarily.
> >>
> >> There is the old National/TI LM386-4 that I just now heard is going
> >> obsolete ! Dang. It looked like it was going to work.
> >>
> >> Could go discreet with op-amp and SOT-23s but still wouldn't have the
> >> volume/gain control pin without adding a Jfet or something and would
> >> take up valuable space on one of the existing products.
> >>
> >> Any suggestions ?
> >>
> >> Thanks,
> >> boB
> >> K7IQ
> >>
> >>
> >> http://www.nxp.com/documents/data_sheet/TDA7052A_AT.pdf
> >>
> >> 1 W BTL mono audio amplifier with DC volume control TDA7052A/AT
> >>
> >I had the same problem.... switched to the SOIC8 version . You can just
> >about solder across the dil pads as an interim solution. I guess I'll be
> >looking for a solution too. Maybe I'll have to bulk buy. :(
> >
> >---
> >This email has been checked for viruses by Avast antivirus software.
> >https://www.avast.com/antivirus
>
>
> Thanks TT...
> We are going to have to do a bulk buy as well. End of 2016 is it.
> There are quite a few at distrubuters and I think we have almost
> 10,000 now but will need to substitute something. They were the
> perfect parts and cheap... 32 cents each. I was ready to design in
> the LM386-4 which has a gain control but NOW they're life is going to
> be short lived as well.
Well a life time buy is what we would do.
$0.32 is pretty cheap. There is the TCA0372 it's a dual opamp..
if that would work... you've probably already thought about it.
George H.
>
> There's gotta be some asian part I would think ? TV sets and all
> that. Might all be Class D. Actually I found a Class D chip but no
> volume/gain control. Would have to add at least that J-FET to the
> circuit which isn't the end of the world BUT it takes up space.
>
> Will stay tuned.
> boB
Reply by Rob●October 28, 20162016-10-28
boB <boB@theresnoplacelikehome.com> wrote:
> It ~may~ actually be (hopefully) that the LM386-4 (the 1 watt
> part) isn't going away... That is what I had heard though through the
> grapevine and the internet which is always true of course. Nothing
> official actually so there is a ray of hope, maybe.
One would think that components like the LM386 would never go away...
The are the basic building blocks of simple electronic devices, like
the 555.