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#101 2015-02-06 20:11:21

max1zzz
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Registered: 2014-05-18
Posts: 207
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Re: mcdermd the Applefool

how does that work as a temp sensor? the 2n3904 is just a NPN transistor

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#102 2015-02-06 21:50:45

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
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Re: mcdermd the Applefool

I know it is but that's what the Apple part is too.


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
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#103 2015-02-07 03:39:48

techknight
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Registered: 2014-05-22
Posts: 453

Re: mcdermd the Applefool

Ah thats kind of neat, using the transistor as a diode PN junction to get temperature readings. Highly inaccurate, but it works.

Cheap household thermostats do the same thing but with a big package silicon diode.

The forward junction resistance/voltage drop falls as the diode heats up. The rate at which conduction "increases" per degree C is in the datasheet, but it varies widely between parts, which is why its inaccurate.

Last edited by techknight (2015-02-07 03:40:43)

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#104 2015-02-07 14:42:06

max1zzz
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Registered: 2014-05-18
Posts: 207
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Re: mcdermd the Applefool

Ahh, that makes sense, thanks for clearing that one up smile

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#105 2015-02-17 07:07:30

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
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Re: mcdermd the Applefool

With the previous project moved into the house,

33cyghy.jpg


I picked up another project tonight ...

2m7cl51.jpg


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#106 2015-02-17 07:32:06

LCGuy
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From: Sydney, Australia
Registered: 2014-05-13
Posts: 855

Re: mcdermd the Applefool

Nice! It must be awesome having basically a small arcade in your house smile

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#107 2015-02-17 16:47:49

ClassicHasClass
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From: Electron Alley
Registered: 2014-05-26
Posts: 1,118
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Re: mcdermd the Applefool

I think it's cool you've got one of the Fix it Felix Jr games, because those were totally cool back in the day and everyone remembers them and they were totally not a later movie tie-in. smile


Machine room (updated for 2019!): http://www.floodgap.com/etc/machines.html

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#108 2015-02-17 20:59:11

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
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Re: mcdermd the Applefool

My kids love it. We custom built it.


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#109 2015-02-17 22:27:26

ClassicHasClass
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From: Electron Alley
Registered: 2014-05-26
Posts: 1,118
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Re: mcdermd the Applefool

Really? That's even cooler! What's inside?


Machine room (updated for 2019!): http://www.floodgap.com/etc/machines.html

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#110 2015-02-18 05:17:40

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
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Re: mcdermd the Applefool

Some old Athlon X2 I skipped from the scrap pile at work with a 16 GB SSD hung off of it. It's running a very stripped down Windows XP with custom splash screens and has the Felix .Net app replacing Explorer. The app was made by "Sjaak" and is a much improved clone of the Disney version (we ran the last Disney beta for a while but the Sjaak version is much better and more complete).

Fuzzy pic:

2ee91d5.jpg

The Disney cabs have a full HP Xeon workstation (complete with case!) running their own app.


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#111 2015-02-26 00:56:41

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
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Re: mcdermd the Applefool

Aaaaand ... whatever mouse was living insidesurely didn't get it's security deposit back. After restringing mouse-eaten monitor wires, a new speaker, new fluorescent tube, new caps, new transistors, a replacement RAM chip and a whole lot of complete disassembly and deep cleaning, it's alive!

asteroids_1.jpg


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#112 2015-02-26 01:04:18

bbraun
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Registered: 2014-05-29
Posts: 1,064
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Re: mcdermd the Applefool

Nice!  Do the transistors in the old arcades typically go bad with age?

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#113 2015-02-26 01:07:59

MJ313
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Registered: 2014-09-23
Posts: 498

Re: mcdermd the Applefool

Fantastic. Just curious, but how do you transport these beasts?

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#114 2015-02-26 16:50:34

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
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Re: mcdermd the Applefool

Most commonly in these old arcade machines, you see the transistors in the monitor go bad which leads to jittery images or even full horizontal or vertical collapse. On this one, I replaced the bottle cap transistors on the monitor's XY amp board and the regulator on the power board because I was already recapping it anyways. It's primary issues were one of the six RAM chips was bad and a lot of monitor wiring had its insulation chewed off.

I've moved these via truck and van. A hand truck helps.


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#115 2015-03-06 23:15:59

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
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Re: mcdermd the Applefool

These arcade machines are about as cantankerous as old Macs. After some burn-in, Asteroids had a couple more chips go bad. Replaced the pre-amp in the audio board and the X/Y opamp chips in the vector output. I'm hoping that does it.

One of these days I need to update this thread with some Mac stuff. I've been distracted, I guess.


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#116 2015-03-07 01:03:28

techknight
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Registered: 2014-05-22
Posts: 453

Re: mcdermd the Applefool

I just got rid of my Sega G80 monster bash arcade. I just didnt find the time, nor the care to restore it. So i got rid of it on VAMPS.

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#117 2015-03-07 12:02:40

MJ313
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Registered: 2014-09-23
Posts: 498

Re: mcdermd the Applefool

mcdermd wrote:

One of these days I need to update this thread with some Mac stuff. I've been distracted, I guess.

Forgive me for being late to the party, but I was refreshing my memory on G4's last night and wound up on LEM website... gotta ask... are you the guy behind LeopardAssist? smile

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#118 2015-03-08 01:43:21

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
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Re: mcdermd the Applefool

No, that's iMic who wrote LeopardAssist. I simply publicized the open firmware commands used to report your proc speed to OS X.


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#119 2015-03-08 07:36:10

iMic
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From: Adelaide, Australia
Registered: 2014-05-12
Posts: 948
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Re: mcdermd the Applefool

Correct, however since I sourced the information from mcdermd's article on LEM, I credited mcdermd and the article in the LeopardAssist About window.


Resident Professor of Alternative Methodology
Faculty of Electronic Restorations & Modifications - "It works, let's fix it!"

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#120 2015-03-09 15:01:22

MJ313
Member
Registered: 2014-09-23
Posts: 498

Re: mcdermd the Applefool

iMic wrote:

Correct, however since I sourced the information from mcdermd's article on LEM, I credited mcdermd and the article in the LeopardAssist About window.

Well, thanks for putting that very useful piece of s/w together... I got Leopard up and running on an iMac G4 800 smile

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#121 2015-03-09 16:21:23

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
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Re: mcdermd the Applefool

It is really slick!


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#122 2015-03-17 22:14:39

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
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Re: mcdermd the Applefool

Found a free LC520 that wouldn't power on. After a 90% recap (I skipped the 10uf cap because I don't have any right now), it now powers on but no bong. It just starts moaning like a cat in a fight. lol I've never had a Mac do this before.


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#123 2015-04-15 16:21:38

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
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Re: mcdermd the Applefool

Grabbed an odd duck from the recycling yesterday - an external SCSI PLI SuperFloppy drive for NeXT systems. The styling is spot-on NeXTStation and it seems to work fine. It was the only piece of NeXT gear in there but it looked like they had recently taken the large items out. It sure would be a shame if there was other NeXT gear back there, waiting to be ripped apart and "recycled".


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#124 2015-05-23 02:46:36

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
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Re: mcdermd the Applefool

This only has a few small bits left to finish but the latest project is "done":

2hyjwhf.jpg
20z39eo.jpg

Not bad for not working and looking like this a few weeks ago:

2wcg10z.jpg

Which was better than when I got it. It didn't work and was covered in a thick layer of dust and cigarette tar, inside and out.


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#125 2015-05-23 04:54:24

LCGuy
Administrator
From: Sydney, Australia
Registered: 2014-05-13
Posts: 855

Re: mcdermd the Applefool

Those table top games bring back memories...I remember when I was a kid (in the early to mid 90's) every fish and chip shop had one...sadly Mum wouldn't let me play them...though when I went with Dad he often gave me 20 cents so I could have a go big_smile

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