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Re: Jaycar.

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On 29/05/2022 7:28 pm, keithr0 wrote:
> On 29/05/2022 4:10 pm, Trevor Wilson wrote:
>> On 29/05/2022 11:29 am, keithr0 wrote:
>>> On 29/05/2022 6:52 am, Trevor Wilson wrote:
>>>
>>>> **My experience with Jaycar plugpacks is not as stellar. I worked on 
>>>> a project for a client a few years back and I purchased 600 X 15VAC, 
>>>> 300ma plug packs from Jaycar. After a few months in the field they 
>>>> began failing (the absolute maximum current drawn was 100ma). When 
>>>> 10% if the plugpacks had failed, I sourced new plugpacks from an 
>>>> Australian manufacturer. These were rated at 16VAC, 100ma. To date 
>>>> (and it has been 25 years) I've had to supply 3 replacements.
>>>>
>>>> A 10% failure rate is appallingly bad. A 10% failure rate in a 
>>>> period of a few months is simply unforgivable.
>>>
>>> Have you not heard of the "Bathtub" curve of reliability? Over a 
>>> large number of components, the failure rate is high early on, then 
>>> it falls to a lower steady level rising again when the component 
>>> reaches EOL. We used to deal in 10s of thousands of hard disks, and 
>>> the effect was very noticeable.
>>
>> **So, I take that you consider a 10% failure rate in the first half of 
>> your bathtub curve is acceptable?
> 
> Not good but I've seen such major issues with gear from well known 
> manufacturers over the years.

**Certainly, but we are talking about a plugpack and one that lacked any 
additional components, other than a transformer. They don't get much 
simpler.

> 
>> I do not. It is completely unacceptable.
>>
>> Back when I worked at Marantz, the Model 1070 was quite reliable and 
>> used several hundred individual components. The failure rate was 0.5% 
>> within the 3 year warranty period.
>>
>> And, to underline the reliability thing, the device that the plugpack 
>> was used with consisted of a microprocessor, 2 line LCD display, a 
>> NiCad battery pack and a few dozen support components, including NiCad 
>> charger. Only one was returned for repair and that turned out to be a 
>> fault with the 128 strand, silicone wire leads that was connected to 
>> the outside world.
> 
> All that in a plugpack?

**Huh? I stated that the plugpack was connected to a device. The device, 
itself, has been extremely reliable. In fact, I am unaware of any 
failures, but I'm confident some may have had failed NiCad battery packs 
by this time. IT is the Jaycar plugpack that was unreliable. Everything 
has been fine. That said, the company that engaged me to design the 
product is long gone, so I have no idea what has happened in the past 15 
~ 16 years.

My other point, lest it be forgotten, is that I engaged an Australian 
transformer manufacturer to construct AC output transformers for the 
device. Those transformers demonstrated vastly superior reliability.

> 
>> Yet, Jaycar plugpacks exhibited a 10% failure rate. Their replacement 
>> packs (which cost more) were made in Australia and have exhibited a 
>> far greater reliability.
> 

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Thread

Jaycar. keithr0 <user@account.invalid> - 2022-05-26 17:03 +1000
  Re: Jaycar. Sylvia Else <sylvia@email.invalid> - 2022-05-26 18:51 +1000
    Re: Jaycar. Trevor Wilson <trevor@rageaudio.com.au> - 2022-05-27 05:01 +1000
      Re: Jaycar. "Rod Speed" <rod.speed.aaa@gmail.com> - 2022-05-27 08:27 +1000
      Re: Jaycar. keithr0 <user@account.invalid> - 2022-05-27 11:49 +1000
      Re: Jaycar. Clocky <notgonna@happen.com> - 2022-05-27 13:23 +0800
        Re: Jaycar. Trevor Wilson <trevor@rageaudio.com.au> - 2022-05-27 16:30 +1000
          Re: Jaycar. "Rod Speed" <rod.speed.aaa@gmail.com> - 2022-05-27 21:19 +1000
            Re: Jaycar. Trevor Wilson <trevor@rageaudio.com.au> - 2022-05-28 16:05 +1000
              Re: Jaycar. "Rod Speed" <rod.speed.aaa@gmail.com> - 2022-05-29 04:54 +1000
                Re: Jaycar. Trevor Wilson <trevor@rageaudio.com.au> - 2022-05-29 06:52 +1000
                Re: Jaycar. "Rod Speed" <rod.speed.aaa@gmail.com> - 2022-05-29 07:31 +1000
                Re: Jaycar. Trevor Wilson <trevor@rageaudio.com.au> - 2022-05-29 07:56 +1000
                Re: Jaycar. Phil Allison <pallison49@gmail.com> - 2022-05-28 15:28 -0700
                Re: Jaycar. "Rod Speed" <rod.speed.aaa@gmail.com> - 2022-05-29 08:28 +1000
                Re: Jaycar. "Gary R. Schmidt" <grschmidt@acm.org> - 2022-05-29 15:30 +1000
                Re: Jaycar. keithr0 <user@account.invalid> - 2022-05-29 11:29 +1000
                Re: Jaycar. Phil Allison <pallison49@gmail.com> - 2022-05-28 18:33 -0700
                Re: Jaycar. keithr0 <user@account.invalid> - 2022-05-29 15:48 +1000
                Re: Jaycar. Phil Allison <pallison49@gmail.com> - 2022-05-29 00:12 -0700
                Re: Jaycar. Xeno <xenolith@optusnet.com.au> - 2022-05-29 17:26 +1000
                Re: Jaycar. Phil Allison <pallison49@gmail.com> - 2022-05-29 02:07 -0700
                Re: Jaycar. Trevor Wilson <trevor@rageaudio.com.au> - 2022-05-29 16:10 +1000
                Re: Jaycar. keithr0 <user@account.invalid> - 2022-05-29 19:28 +1000
                Re: Jaycar. Trevor Wilson <trevor@rageaudio.com.au> - 2022-05-30 07:05 +1000
                Re: Jaycar. Daniel65 <daniel47@eternal-september.org> - 2022-05-29 21:12 +1000
                Re: Jaycar. Daniel65 <daniel47@eternal-september.org> - 2022-05-30 19:33 +1000
                Re: Jaycar. "Rod Speed" <rod.speed.aaa@gmail.com> - 2022-05-30 19:49 +1000
                Re: Jaycar. "Rod Speed" <rod.speed.aaa@gmail.com> - 2022-05-30 19:44 +1000
                Re: Jaycar. Daniel65 <daniel47@eternal-september.org> - 2022-05-31 19:15 +1000
          Re: Jaycar. Phil Allison <pallison49@gmail.com> - 2022-05-27 16:15 -0700
          Re: Jaycar. Clocky <notgonna@happen.com> - 2022-05-28 09:01 +0800
            Re: Jaycar. Phil Allison <pallison49@gmail.com> - 2022-05-27 18:51 -0700
              Re: Jaycar. Phil Allison <pallison49@gmail.com> - 2022-05-28 00:30 -0700
                Re: Jaycar. Trevor Wilson <trevor@rageaudio.com.au> - 2022-05-28 18:11 +1000
                Re: Jaycar. Clocky <notgonna@happen.com> - 2022-06-24 09:40 +0800
                Re: Jaycar. Phil Allison <pallison49@gmail.com> - 2022-06-23 20:03 -0700
    Re: Jaycar. "Rod Speed" <rod.speed.aaa@gmail.com> - 2022-05-27 08:25 +1000

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