Plug in components and then "wire them up" in software

<https://youtu.be/_k0aKM68Xl4>

On 08/10/2023 17:50, Andy Burns wrote:
> Plug in components and then "wire them up" in software
>
> <https://youtu.be/_k0aKM68Xl4>

Mice...

How much I wonder?

--
Cheers,

John.

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John Rumm wrote:

> Andy Burns wrote:
>
>> Plug in components and then "wire them up" in software
>>
>> <https://youtu.be/_k0aKM68Xl4>
>
> Mice...
> How much I wonder?

Rats ... £250

On 08/10/2023 17:50, Andy Burns wrote:
> Plug in components and then "wire them up" in software
>
> <https://youtu.be/_k0aKM68Xl4>

I would be very wary about using this for analogue experimentation and
if playing with digital an FPGA is cheaper.

Andy Bennett wrote:

> Andy Burns wrote:
>
>> Plug in components and then "wire them up" in software
>> <https://youtu.be/_k0aKM68Xl4>
>
> I would be very wary about using this for analogue experimentation and
> if playing with digital an FPGA is cheaper.

When I looked earlier, I though it said the crosspoint switch chips were
75 milliohms, but it turns out to be 75 ohms which I'd have thought
would cause havoc with many circuits?

<https://www.tindie.com/products/architeuthisflux/jumperless>

On 09/10/2023 08:36, Andy Burns wrote:
> Andy Bennett wrote:
>
>> Andy Burns wrote:
>>
>>> Plug in components and then "wire them up" in software
>>> <https://youtu.be/_k0aKM68Xl4>
>>
>> I would be very wary about using this for analogue experimentation and
>> if playing with digital an FPGA is cheaper.
>
> When I looked earlier, I though it said the crosspoint switch chips were
> 75 milliohms, but it turns out to be 75 ohms which I'd have thought
> would cause havoc with many circuits?
>
> <https://www.tindie.com/products/architeuthisflux/jumperless>
>

Agreed, plus the leakage currents and crosstalk will be problematic in
the analogue domain.

In summary I think it's an expensive inferior solution looking for a
problem.

.. Playing on words here, is this what is called using your loaf.
#why have any hardware at all, there used to be software where you could
draw a circuit complete with symbols then run it and be able to see what it
does etc.
The main reason for breadboarding would be to check any problems with
interaction between normal sized components etc. Then I guess your original
software would have been able to produce the mask to make the pcb.
Brian

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"Andy Bennett" <aben@ben37j.com> wrote in message
news:oJNUM.236171$jff3.188850@fx14.ams4...
> On 08/10/2023 17:50, Andy Burns wrote:
>> Plug in components and then "wire them up" in software
>>
>> <https://youtu.be/_k0aKM68Xl4>
>
> I would be very wary about using this for analogue experimentation and if
> playing with digital an FPGA is cheaper.

On 09/10/2023 08:36, Andy Burns wrote:
> Andy Bennett wrote:
>
>> Andy Burns wrote:
>>
>>> Plug in components and then "wire them up" in software
>>> <https://youtu.be/_k0aKM68Xl4>
>>
>> I would be very wary about using this for analogue experimentation and
>> if playing with digital an FPGA is cheaper.
>
> When I looked earlier, I though it said the crosspoint switch chips were
> 75 milliohms, but it turns out to be 75 ohms which I'd have thought
> would cause havoc with many circuits?
>
> <https://www.tindie.com/products/architeuthisflux/jumperless>
>

It could also be a very expensive fuse if you accidentally try and pass
too much current. Program in the wrong link and watch for the magic smoke.

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alan_m <junk@admac.myzen.co.uk> wrote:
> On 09/10/2023 08:36, Andy Burns wrote:
> > Andy Bennett wrote:
> >
> >> Andy Burns wrote:
> >>
> >>> Plug in components and then "wire them up" in software
> >>> <https://youtu.be/_k0aKM68Xl4>
> >>
> >> I would be very wary about using this for analogue experimentation and
> >> if playing with digital an FPGA is cheaper.
> >
> > When I looked earlier, I though it said the crosspoint switch chips were
> > 75 milliohms, but it turns out to be 75 ohms which I'd have thought
> > would cause havoc with many circuits?
> >
> > <https://www.tindie.com/products/architeuthisflux/jumperless>
> >
>
> It could also be a very expensive fuse if you accidentally try and pass
> too much current. Program in the wrong link and watch for the magic smoke.

If it's successfully shorted 12V, the current will be 160mA. The developer
says they've successfully run 200mA through a connection for minutes, which
have a max rating of 100mA per chip and 15mA per connection. They also say
the switch chips are easy to change with a hot air gun, and offer to supply
spares in the box. The CH446Q chips are $1.76 to buy.

A neat move would be to mount a temperature sensor under each chip and shut
things off if they are getting warm.

Theo

On 09/10/2023 11:28, Theo wrote:

> If it's successfully shorted 12V, the current will be 160mA. The developer
> says they've successfully run 200mA through a connection for minutes, which
> have a max rating of 100mA per chip and 15mA per connection.

So the developer has done 5 minutes of testing and run a one junction at
12x it's specified rating. Does that switch now operate with the same
insertion loss and speed etc. What happens if you overrun more than one
adjacent switch in the package?

> They also say
> the switch chips are easy to change with a hot air gun, and offer to supply
> spares in the box. The CH446Q chips are $1.76 to buy.

So, not only do you have to have the skills in designing but also the
skills in changing 44 pin surface mount components without damaging the
PCB that they are attached to.

> A neat move would be to mount a temperature sensor under each chip and shut
> things off if they are getting warm.

It all depends what gets shut off.

I have the T shirt from 40 years ago where completely shutting off the
+ve supply to a VERY expensive IC that required a +ve and -ve supplies
caused the magic smoke. Having too much complex protection can actually
be worse than having no protection at all. Much like having a Built In
Test (BIT) that is more complex than what you are trying to monitor is
likely to have more bugs/faults than the rest of the design.

BTW, the on resistance of around 65 ohms is only when the power supply
is at its maximum value. Take the supply to around 5V (as for a typical
battery supply) and the on resistance is more like 180 Ohms rising to
225 Ohms as the chip temperature reaches 85C.

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