7 Aug
2021
7 Aug
'21
5:50 p.m.
Anyone have an early ?80s Motorola semiconductor reference manual? I am attempting to
repair a Boschert power supply from ~1983 that is full of Motorola parts marked as 1027
(DO-42ish), 1077 (TO-3ish), 1078 (DO-5ish), etc. It would be extremely helpful to know
their specifications, or ideally how to cross-ref them to ?standard? parts.
ok
bear.
7 Aug
7 Aug
7:24 p.m.
On 8/7/21 5:50 PM, r.stricklin via cctech wrote:
Anyone have an early ?80s Motorola semiconductor
reference manual? I am attempting to repair a Boschert power supply from ~1983 that is
full of Motorola parts marked as 1027 (DO-42ish), 1077 (TO-3ish), 1078 (DO-5ish), etc. It
would be extremely helpful to know their specifications, or ideally how to cross-ref them
to ?standard? parts.
Those are Boschert "house numbers'. Unless you can find a Boschert
maintenance document that lists them and ther equivalents, it's going to
be a bit of a detective sleuth.
--Chuck
8:20 p.m.
On Aug 7, 2021, at 7:24 PM, Chuck Guzis via cctech
<cctech at classiccmp.org> wrote:
On 8/7/21 5:50 PM, r.stricklin via cctech wrote:
Ugh? I hadn?t even thought of that. You?re confident of it?
ok
bear.
Anyone have an early ?80s Motorola semiconductor
reference manual? I am attempting to repair a Boschert power supply from ~1983 that is
full of Motorola parts marked as 1027 (DO-42ish), 1077 (TO-3ish), 1078 (DO-5ish), etc. It
would be extremely helpful to know their specifications, or ideally how to cross-ref them
to ?standard? parts.
Those are Boschert "house numbers'. Unless you can find a Boschert
maintenance document that lists them and ther equivalents, it's going to
be a bit of a detective sleuth.
9:17 p.m.
On 8/7/21 8:20 PM, r.stricklin wrote:
Ugh? I hadn?t even thought of that. You?re confident of it?
Until someone comes up with a better theory, yes. Consider this supply:
http://bitsavers.org/pdf/boschert/Boschert_OL25_Single-Stage_Power_Supply_M…
Go to the BOM on page 32. Note hat a 10-1038 is a 1N4004, a 10-1013 is
a 1N4148, a 13-1055 is a MPS2222, and so on. Your numbers seem to
follow this line, just without the prefix, which I assume indicates the
general type of component; e.g. 10 - silicon rectifier diode; 13 an NPN
transistor, 12 a PNP and so on.
Or the BOM on page 10 here:
http://bitsavers.org/pdf/boschert/XL25.pdf
Follows the same convention, with some of the same part numbers. It's
curious that Q1, the inverter power transistor, doesn't appear on the
BOM, though the schematic says MJE13006. Could be that there's no
substitute.
--Chuck
9:48 p.m.
On Aug 7, 2021, at 9:17 PM, Chuck Guzis <cclist at
sydex.com> wrote:
On 8/7/21 8:20 PM, r.stricklin wrote:
I?m convinced.
Annoying, but I still appreciate the tip. I think I can get where I need to go with the
assorted Boschert manuals on Bitsavers, if I put the effort into tracing mine out.
It looks a lot, based on where they appear in the schematics, like a reasonable guess that
the four 1027 (DO-42ish) devices I diked out (and one of which is shorted) are either
1N4004 or MR820. Based on the packaging I think I can guess they are perhaps 1N4004
(59-10).
But I should trace the thing out anyway and try to draw my own schematic, first.
Thanks.
ok
bear.
Ugh? I hadn?t even thought of that. You?re
confident of it?
Until someone comes up with a better theory, yes. Consider this
supply:
http://bitsavers.org/pdf/boschert/Boschert_OL25_Single-Stage_Power_Supply_M…
Go to the BOM on page 32. Note hat a 10-1038 is a 1N4004, a 10-1013 is
a 1N4148, a 13-1055 is a MPS2222, and so on. Your numbers seem to
follow this line, just without the prefix, which I assume indicates the
general type of component; e.g. 10 - silicon rectifier diode; 13 an NPN
transistor, 12 a PNP and so on. 
8 Aug
8 Aug
12:30 a.m.
On Sun, Aug 8, 2021 at 5:57 AM Al Kossow via cctalk
<cctalk at classiccmp.org> wrote:
On 8/7/21 9:48 PM, r.stricklin via cctalk wrote:
Would you also like the schematics I traced out of the Boschert OL130
SMPSU and a little Boschet 12V linear regulator? They are part of the
Atlantic Research Intervew 3600 that I worked on last year.
I also have the official ICL document for the PERQ 1 power supply
section, which is a Boschert unit. It includes the schematic (most of
it, the -ve resistance board is not included for some reason). I can
try to scan it if there is any interest
Note that many of these units contain 'selected' transistors. That's
one reason for the house numbers. It may well be a 2Nxxxx but one that
has been tested for some parameter. Without knowing what it was tested
for you are going to have 'fun'.
-tony
But I should trace the thing out anyway and try
to draw my own schematic, first.
if you do trace it out, I'd like to add it to bitsavers.
there aren't many boschert schematics on the web
8 a.m.
On 8/8/21 12:30 AM, Tony Duell via cctalk wrote:
Note that many of these units contain
'selected' transistors. That's
one reason for the house numbers. It may well be a 2Nxxxx but one that
has been tested for some parameter. Without knowing what it was tested
for you are going to have 'fun'.
That's a good point--and one I thought about mentioning. I recall
chatting with some of the people who worked with Bob and their take
seemed to be that early SMPSU design was half engineering and half voodoo.
--Chuck
4:26 a.m.
On 8/7/21 9:48 PM, r.stricklin via cctalk wrote:
Annoying, but I still appreciate the tip. I think I
can get where I need to go with the assorted Boschert manuals on Bitsavers, if I put the
effort into tracing mine out.
Tony forwarded me some schematics which i've added to
http://bitsavers.org/pdf/boschert
the OL400 from the PERQ was a nice find since their 1980's higher wattage supplies are
very hard to find information on
6:34 a.m.
Not directly useful for part number interchange, but schematic and
mechanicals for the 3T series switching regulators here:
http://www.rknorman.co.uk/Boschert%20PSU%20Circuit%20diagram.pdf
On Sun, 8 Aug 2021 04:26:30 -0700
Al Kossow via cctalk <cctalk at classiccmp.org> wrote:
On 8/7/21 9:48 PM, r.stricklin via cctalk wrote:
Annoying, but I still appreciate the tip. I think
I can get where I
need to go with the assorted Boschert manuals on Bitsavers, if I
put the effort into tracing mine out.
Tony forwarded me some schematics which i've added to
http://bitsavers.org/pdf/boschert
the OL400 from the PERQ was a nice find since their 1980's higher
wattage supplies are very hard to find information on
13 Aug
13 Aug
8:43 a.m.
I have Motorola's "linear circuits" and "interface circuits" from
1979, but
actual Semiconductor Data Books I only have are from 1969-1973.
On Sun, Aug 8, 2021 at 9:34 AM James B DiGriz via cctalk <
cctalk at classiccmp.org> wrote:
Not directly useful for part number interchange, but
schematic and
mechanicals for the 3T series switching regulators here:
http://www.rknorman.co.uk/Boschert%20PSU%20Circuit%20diagram.pdf
On Sun, 8 Aug 2021 04:26:30 -0700
Al Kossow via cctalk <cctalk at classiccmp.org> wrote:
On 8/7/21 9:48 PM, r.stricklin via cctalk wrote:
Annoying, but I still appreciate the tip. I think
I can get where I
need to go with the assorted Boschert manuals on Bitsavers, if I
put the effort into tracing mine out.
Tony forwarded me some schematics which i've added to
http://bitsavers.org/pdf/boschert
the OL400 from the PERQ was a nice find since their 1980's higher
wattage supplies are very hard to find information on
8 Aug
8 Aug
3:38 p.m.
I found a few of the databooks here:
https://usermanual.wiki/search.php?q=motorola%20semiconductor%20reference
Randy
________________________________
From: cctech <cctech-bounces at classiccmp.org> on behalf of r.stricklin via cctech
<cctech at classiccmp.org>
Sent: Saturday, August 7, 2021 5:50 PM
To: General Discussion: On-Topic Posts <cctech at classiccmp.org>
Subject: Early '80s Motorola Semiconductor Reference - anyone?
Anyone have an early ?80s Motorola semiconductor reference manual? I am attempting to
repair a Boschert power supply from ~1983 that is full of Motorola parts marked as 1027
(DO-42ish), 1077 (TO-3ish), 1078 (DO-5ish), etc. It would be extremely helpful to know
their specifications, or ideally how to cross-ref them to ?standard? parts.
ok
bear.
9 Aug
9 Aug
12:03 a.m.
On 8/8/21 3:38 PM, Randy Dawson via cctech wrote:
I found a few of the databooks here:
https://usermanual.wiki/search.php?q=motorola%20semiconductor%20reference
Randy, if you're looking for Moto databooks, Al has archived a pile of
them on bitsavers:
http://bitsavers.org/components/motorola/_dataBooks/
--Chuck
993
days inactive
998
days old
12 comments
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participants (7)
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aek＠bitsavers.org -
ard.p850ug1＠gmail.com -
bear＠typewritten.org -
billdegnan＠gmail.com -
cclist＠sydex.com -
jbdigriz＠dragonsweb.org -
rdawson16＠hotmail.com