[sdiy] DIY patch matrix idea

[Oren Leavitt]

Yeah, the push switches are definitely an idea. I was toying with the 
"low tech" jacks/plugs approach as I have a lot of them laying around.

Jim, I was thinking plain old panel mount jacks.

I certainly love the electronic switching solutions available today. It 
is a far cry from my first crack at a 4x4 matrix using 4016s some years ago.

- Oren

On 5/21/2016 1:17 PM, sleepy_dog at gmx.de wrote:
>
> ah, and here's a slightly more expensive one with cap:
> http://shop.boxtec.ch/mini-self-lock-push-switch-6pin-8x8mm-p-42036.html
>
> Also, should you ever need to shoot rockets off your gear (like Keith
> Emerson, R.I.P.), there you go:
> http://shop.boxtec.ch/missile-switch-with-cover-p-40540.html
>
>
> Steve
>
>
> Am 21.05.2016 um 20:12 schrieb sleepy_dog at gmx.de:
>>
>> how about using an array of small switches (no idea what they're
>> called) like those here?
>> maybe with 2 sets of contacts, one of which is used to enable a led.
>> But perhaps it's also visible enough which are "on"  (because they are
>> lower) without led.
>>
>> Mini Self Lock Push Switch 6pin - 7x7mm, Simple and small 7 x 7mm
>> 6-pin 3PST switch for PCB mounting
>> http://shop.boxtec.ch/mini-self-lock-push-switch-6pin-7x7mm-p-42038.html
>>
>> 0.80 CHF pretty much equals 0.80 USD, if you buy 50 pcs, it's only
>> 0.41 / piece. For 8x8=64 that'd be < 27 USD
>> Sounds bearable.
>>
>> Steve
>>
>>
>> Am 21.05.2016 um 18:35 schrieb Jim Patchell:
>>> Oren-
>>>
>>> Struck a nerve with me.  However, so far, I have not been able to
>>> locate PCB mount Vertical 3.5mm stereo phone jacks.  Is this what you
>>> were planning to use?  And if so, could you clue me in to who sells
>>> them?  Mouser, Digikey, Tayda and Small Bear all have come up short.
>>>
>>> -Jim
>>>
>>>
>>> On 5/20/2016 8:09 PM, Oren Leavitt wrote:
>>>> With sources of ready-made patch matrix solutions being scarce, I
>>>> have been mulling over ideas for a DIY patch matrix.
>>>>
>>>> I am thinking of using 2.5mm or 3.5mm stereo TRS mini phone jacks
>>>> arranged in a matrix. These can purchased in bulk for reasonable
>>>> prices. The tips would be wired as "columns" connecting to a source.
>>>> The rings wired as "rows" connecting to a summing node input.
>>>>
>>>> The plugs would house a standard 100K resistor wired from the tip
>>>> (source) to the ring (summing node input). Additional "special"
>>>> plugs can be fitted with smaller or larger resistors for added gain
>>>> or attenuation, or an AC coupling capacitor.
>>>>
>>>> These jacks could even be used as "inserts" for an external signal
>>>> processor between source and input.
>>>>
>>>> - Oren
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>>>
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>>
>
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