Unrepairable preferred
It'll be going into an epoxy resin setup that someone I know is doing for a
table, and I really want to get something that still LOOKS OK but is...
well, just faulty and won't be restorable to service so we don't destroy
any potentially usable hardware.
Ideas/suggestions we
Mistake below, Vo should be a fraction of 5 volts, not "a volt" when
operating
On Fri, Jul 10, 2020 at 2:28 PM Ian Finder wrote:
> A few responses-
>
> On Fri, Jul 10, 2020 at 12:29 PM Brent Hilpert wrote:
>
>> Reading that datasheet, it appears that to reduce power consumption those
>> sensors
On 7/10/20 2:14 PM, Al Kossow via cctalk wrote:
There are a couple of serious researchers out there who do useful work, here is
what exists for the SD switch
https://deskthority.net/wiki/Micro_Switch_SD_Series
the schematic of the 1660 microswitch keyboard can be found on page 235 of the
ma
A few responses-
On Fri, Jul 10, 2020 at 12:29 PM Brent Hilpert wrote:
> Reading that datasheet, it appears that to reduce power consumption those
> sensors employ pulsed sleep/wake operation, presenting up to a 1/8 second
> delay in response time. Probably not very good for use in a keyboard, a
What type of computer is your friend restoring?
I don't think he wants to reveal that, and it shouldn't matter anyway.
There are a couple of serious researchers out there who do useful work, here is
what exists for the SD switch
https://deskthority.net/wiki/Micro_Switch_SD_Series
Hi Ian,
What type of computer is your friend restoring? I can't help as I have a
full keyboard that I'd like to keep intact but this is a home made
terminal/keyboard made from Diablo 1620 parts including the keyboard and I
believe the HyTerm main board. It has SD switches but they are mostly
4B
On 2020-Jul-10, at 11:27 AM, Ian Finder via cctalk wrote:
> On Fri, Jul 10, 2020 at 11:06 AM Al Kossow via cctalk
> wrote:
>>
>> Since it isn't very fancy, I wonder if you could make a new board with a
>> modern Hall
>> effect sensor? You just need a contact closure.
> Yeah Al, that's a great su
This is not exactly vintage computer, but it is very close. A friend just
gave me an HP 16C calculator in excellent, working condition, EXCEPT the 16C
badge (or logo if you prefer) is missing. I seem to recall that, some years
ago, someone on this list knew of a source for replacements but I can'
On 7/10/20 10:42 AM, Electronics Plus via cctech wrote:
I have a number of keyboards with Micro Switch ST switches, but no SD.
Does anyone still use old Memorex or Telex keyboards?
YES! I have terminals w/o keyboards
We regret to announce...
There will be no VCF Midwest this year.
The conditions imposed upon us by the CoViD-19 pandemic and related
government regulations, as well as a depressed expected turn-out
figure, will make it impossible for us to host an event of the size
and quality our dedicated fans
Yeah Al, that's a great suggestion. I was looking at the AH1815 last night.
The challenge is getting the whole assembly as thin as the original, which
presents a not insignificant challenge-
Even using the SOT553 package of this:
https://cdn.sparkfun.com/assets/4/4/8/2/a/AH1815.pdf - I'd have to d
On 2020-Jul-09, at 10:12 PM, Ian Finder wrote:
>> On Jul 9, 2020, at 21:58, Brent Hilpert wrote:
>> On 2020-Jul-09, at 9:39 PM, Ian Finder via cctalk wrote:
>>
>>> I know what you guys are thinking- no, this isn't for a keyboard collection
>>> or some modern build or some other nonsense like tha
Thanks Cindy-
Unfortunately those won't work :(
On Fri, Jul 10, 2020 at 10:42 AM Electronics Plus
wrote:
> I have a number of keyboards with Micro Switch ST switches, but no SD.
> Does anyone still use old Memorex or Telex keyboards?
>
> -Original Message-
> From: cctech [mailto:cctech-
I have a number of keyboards with Micro Switch ST switches, but no SD.
Does anyone still use old Memorex or Telex keyboards?
-Original Message-
From: cctech [mailto:cctech-boun...@classiccmp.org] On Behalf Of Ian Finder via
cctech
Sent: Thursday, July 09, 2020 11:34 PM
To: classic...@clas
On 7/10/20 9:45 AM, Al Kossow via cctalk wrote:
4B3A is a non-multiplexed contact closure type which is extremely difficult to
find.
Since it isn't very fancy, I wonder if you could make a new board with a modern
Hall
effect sensor? You just need a contact closure.
On 7/9/20 9:34 PM, Ian Finder via cctalk wrote:
The correct SD-series replacement switch would be the 4B3A-
It would be interesting to understand the failure mode. I wonder if they
passivated
the die correctly?
4B3A is a non-multiplexed contact closure type which is extremely difficult to
f
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