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DC Current Gain on transistor

Last post by mikro « Thu Nov 14, 2019 4:53 pm
Replies: 2
by mikro » Thu Nov 14, 2019 3:17 pm

Hey guys,

this is going to be one of the I have no clue but need to solder it anyway question. ;-)

I'm upgrading a CRT monitor and one part I need...

2 Replies

90 Views

Last post by mikro
Thu Nov 14, 2019 4:53 pm
100MHz Oscilloscope

Last post by Icky « Wed Nov 06, 2019 5:56 pm
Replies: 5
by PaulJ_2.0 » Wed Nov 06, 2019 11:36 am

I was browsing Ebay for a 100MHz scope, expecting to pay around £400 and this popped up in the search:

Now usually I am not a huge fan of these...

5 Replies

239 Views

Last post by Icky
Wed Nov 06, 2019 5:56 pm
Project : Using a Touch Key Self-locking Switch Module with Exxos RAM Kit

Last post by Maximilian « Sat Oct 26, 2019 9:56 pm
Replies: 5
by Marsupilami » Sat Oct 26, 2019 1:54 pm

Hello,

I bought this little module in China at sunsky-online.com : A007 Touch Key Key Self-locking Switch Module (~3$ each) .

As I don't like to...

5 Replies

301 Views

Last post by Maximilian
Sat Oct 26, 2019 9:56 pm
How To Desolder Electronic Parts Using Different Tools.

Last post by miguel « Sun Oct 20, 2019 1:02 pm
Replies: 2
by exxos » Tue Jan 09, 2018 9:37 pm

Interesting video on various de-soldering tools.

2 Replies

1044 Views

Last post by miguel
Sun Oct 20, 2019 1:02 pm
World's smallest acceleator card atm

Last post by go0se « Thu Oct 10, 2019 12:57 pm
Replies: 18
by 8 Bit Dreams » Thu Oct 03, 2019 1:15 pm
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This was shown on A1k:
FPGA mit SD-k.jpg

Keyfeatures:
Artix7 - FPGA (215k Logic Cells)
64MB SD-RAM (32Bit Bus)
16MB FlashROM
Micro-SD-Card Slot...
18 Replies

2911 Views

Last post by go0se
Thu Oct 10, 2019 12:57 pm
Capacitor Tutorial (Electrolytic, Tantalum, & Plastic Film)

Last post by juz400 « Tue Sep 17, 2019 8:25 pm
Replies: 7
by exxos » Mon Oct 08, 2018 9:46 pm

Dave jones video - back in video #33... Very compact and informative video from 2009...

Dave mentions problems with ceramics, abiet rare,...

7 Replies

1568 Views

Last post by juz400
Tue Sep 17, 2019 8:25 pm
Tip restorer testing

Last post by juz400 « Fri Sep 13, 2019 7:58 pm
Replies: 20
by exxos » Thu Dec 06, 2018 5:48 pm
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I got one of these to try...

IMG_3671.JPG

Before...

IMG_3672.JPG

Oddly it smells like fruitcake as its just come out of the oven or...
20 Replies

2651 Views

Last post by juz400
Fri Sep 13, 2019 7:58 pm
Fixing smd pads.

Last post by arkadiusz.makarenko « Tue Aug 20, 2019 5:01 pm
Replies: 17
by arkadiusz.makarenko » Mon Aug 19, 2019 7:01 pm
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Hi
I have one board which I messed up a little.
I took few caps with pads. Now how would I go and fix it?
17 Replies

1403 Views

Last post by arkadiusz.makarenko
Tue Aug 20, 2019 5:01 pm
APC SU1400 All lights flashing issue

Last post by exxos « Thu Jun 20, 2019 1:58 pm
Replies: 5
by exxos » Mon Jun 17, 2019 1:25 pm

So my APC 1400 would go for a few weeks, then just die with every light on the front flashing. APC's support pages just says hardware failure which...

5 Replies

1822 Views

Last post by exxos
Thu Jun 20, 2019 1:58 pm
Can anyone identify this part?

Last post by Maximilian « Wed Jun 19, 2019 8:25 pm
Replies: 7
by Steve » Wed Jun 19, 2019 10:05 am

Hey guys,

I've been recently getting in to SGI hardware and a friend of mine is trying to find out what a certain part of his PSU is, perhaps...

7 Replies

881 Views

Last post by Maximilian
Wed Jun 19, 2019 8:25 pm
Advice on fixing an Amiga 500+

Last post by Maximilian « Thu Jun 06, 2019 2:02 am
Replies: 12
by Steve » Wed May 15, 2019 9:49 am
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2
Hi guys,

Symptoms: red then green screen
Solved red screen by replacing the ROM.
New symptom: just pure green screen.

I'm new to Amigas in general...
12 Replies

1964 Views

Last post by Maximilian
Thu Jun 06, 2019 2:02 am
Extending a AAA-size battery with a solid block of copper?

Last post by rubber_jonnie « Mon May 20, 2019 3:35 pm
Replies: 7
by Atarian Computing » Mon May 20, 2019 10:18 am

So I'm also a fanatic MiniDisc user and one of the issues we face are obsolete Li-Ion batteries. NOS-batteries are already dead as they are over...

7 Replies

1349 Views

Last post by rubber_jonnie
Mon May 20, 2019 3:35 pm
Keyboard Membrane Repair

Last post by PaulJ_2.0 « Sat May 18, 2019 12:05 pm

by PaulJ_2.0 » Sat May 18, 2019 12:05 pm

I thought I would share this as it worked.

My Amiga 600 is in great original shape, no yellowing, the drive works faultlessly and it was until...

0 Replies

536 Views

Last post by PaulJ_2.0
Sat May 18, 2019 12:05 pm
Are Bypass Capacitors REALLY needed?

Last post by terriblefire « Tue May 14, 2019 8:48 am
Replies: 6
by exxos » Thu May 24, 2018 12:01 pm

Dave Jones doing another interesting video.

It touches on PCB layout issues vs noise, that is what I spend a lot of time fighting on the ST!

6 Replies

1555 Views

Last post by terriblefire
Tue May 14, 2019 8:48 am
EEVblog #1200 - BUSTED! - Energizer & Duracell NiMH

Last post by DrF « Thu Apr 25, 2019 9:18 am
Replies: 3
by exxos » Fri Apr 12, 2019 2:19 pm

3 Replies

800 Views

Last post by DrF
Thu Apr 25, 2019 9:18 am
Cheap Reflow Oven

Last post by Icky « Sun Apr 21, 2019 8:11 am
Replies: 6
by Icky » Sat Apr 20, 2019 6:48 pm

With all the boards I am working on there are a lot of SMT components and using the hot air rework station is good for some small jobs but for a...

6 Replies

838 Views

Last post by Icky
Sun Apr 21, 2019 8:11 am
New a1200, how are the caps looking?

Last post by Steve « Wed Apr 17, 2019 3:34 pm
Replies: 6
by Steve » Mon Apr 08, 2019 11:05 pm

Hey guys,

As you know I'm an Atari man - but I recently snagged an a1200 for a bargain. Very much looking forward to learning about this machine....

6 Replies

1067 Views

Last post by Steve
Wed Apr 17, 2019 3:34 pm
Logic Analyser on the Cheap

Last post by terriblefire « Thu Apr 04, 2019 12:42 pm
Replies: 21
by Icky » Sat Nov 10, 2018 10:47 pm
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I had noticed a few people on in this community using Logic Analysers (LA) to trace digital signals.

Not wanting to spend a lot of money on one such...
21 Replies

3352 Views

Last post by terriblefire
Thu Apr 04, 2019 12:42 pm
Recommendations for cheap Ultrasonic cleaner

Last post by PhilC « Tue Apr 02, 2019 8:26 pm
Replies: 4
by PhilC » Tue Apr 02, 2019 5:12 pm

Hi All,

As title if you'd be so kind. It won't see a lot of use, hence the cheap price requirement.

Probably biggest thing I'd do is something like...

4 Replies

465 Views

Last post by PhilC
Tue Apr 02, 2019 8:26 pm
DIY PCB Etching With Water

Last post by terriblefire « Sun Mar 31, 2019 9:59 pm
Replies: 1
by exxos » Sun Mar 31, 2019 9:34 pm

Experimenting with etching your own PCB's by concentrating existing ferric chloride levels in tap water. How well does it work?

1 Replies

493 Views

Last post by terriblefire
Sun Mar 31, 2019 9:59 pm
The Evil that is SMD soldering!

Last post by exxos « Tue Mar 19, 2019 3:22 pm
Replies: 3
by Bikerbob » Tue Mar 19, 2019 2:03 pm

So, I dont feel like buying components just to destroy them learning how to do something I no longer have the steady hand or focus for.

BUT there is...

3 Replies

730 Views

Last post by exxos
Tue Mar 19, 2019 3:22 pm
Monitor recapping and low ESR

Last post by chiark « Fri Feb 22, 2019 4:22 pm
Replies: 54
by sandord » Mon Oct 08, 2018 1:52 pm
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I'm planning to recap two Commodore 1084S-D2 and a 1084S-P1 monitors.

I've assembled part lists for both (they are quite different in internal...
54 Replies

8627 Views

Last post by chiark
Fri Feb 22, 2019 4:22 pm
2 Layer vs 4 Layer PCB EMC TESTED (EEV Video)

Last post by DrF « Sat Feb 09, 2019 10:04 am

by DrF » Sat Feb 09, 2019 10:04 am

Topic pops up now and again round here, here's a video with some info on it, I thought was useful anyhow :D

Exxos always ranting about interference...

0 Replies

787 Views

Last post by DrF
Sat Feb 09, 2019 10:04 am
Resistor exploded in my monitor

Last post by exxos « Sun Jan 27, 2019 5:09 pm
Replies: 34
by sandord » Sat Dec 22, 2018 9:24 pm
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Today I soldered a new power switch in my Commodore 1084S-D2 monitor.

When I turned it on, there was a loud bang, rather large flash and a small...
34 Replies

5461 Views

Last post by exxos
Sun Jan 27, 2019 5:09 pm
Undeletable objects in Eagle ?!

Last post by exxos « Fri Jan 25, 2019 5:01 pm
Replies: 9
by exxos » Thu Jan 24, 2019 8:51 pm

At some point I must have added in some squares to stop the autofill filling areas I didn't want it to go.. only.. they seem to be on the top and...

9 Replies

1250 Views

Last post by exxos
Fri Jan 25, 2019 5:01 pm

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