http://atariage.com/forums/topic/224757-adam-internal-power-supply-build/


POST #01 
 
So, I have this ADAM, and it needs the printer to work because it houses the power supply. Guessing many here know this, but I thought for those who don't I'd re-iterate. I've built many computers, and a few have been mini-itx. They use these teeny tiny power supplies and are cheap and easy to get. I happened to have several on hand and settled on an Antec ISK300 Power Supply. The Antec Mini-ITX PSU used a 19v Laptop Style Supply, which are plentiful and easy to acquire.
 
 
 
My Final idea is to be able to plug this into a modern TV (with composite av jacks) and do some gaming and so on. I purchased ADAMcon's IDE CF, Printer Card with Boot EEPROM, and 256k memory expansion. It came with it's own Power Supply, and will be building a lead for it too. The LPT port I'll drill into the back and route internally as well making for a nice tight package.
 
 
 
Power Supply puts out one +12v, +5v, -12v, +3.3v (not used). The ADAM needs +12v 0.3A for Logic (RF Modulator), +12 2.55A for Inductive loads (Data Pack Drives?), -5v 0.2A for Video memory, and +5v 3.0A for Logic (everything else). I plan to use a 7812 Linear Voltage Regulator for the RF circuitry which I'm not even using as I used Composite and Audio out. And a 7905 negative linear voltage regulator to regulate the -12v for the video memory. And a large 4pole double throw toggle switch to switch between the Printer power, and Internal Power. A Single rocker switch up front to switch the +19v supply on and off.
 
 
 
So, this is a build thread to show my progress, and possibly inspire others around to drill and hack into 30+ year old plastic and make something old, better.



POST #02

So, Update Saturday Morning Work 

 
 
Spent WAY too much time making a visio diagram of the schematics, but is worth it to keep all the connections straight in my head.
 
 

POST #03

A plan is made, and now execution!

I reused some computer 4 pin molex connectors, and split the metal crimp to remove the wires. I had a crimp tool from my VEMS fuel injection which seemed to do well, but still soldered the wires together, and heat shrink tubed everything. A little over kill probably, but I started this this way, so gotta finish it now.

Fitment Check.See if everything still goes where it should, not interfering with anything. Also checking the LPT port cable route.

I added a connector between this power switch and wiring. When the switch is installed in front panel, it won't push into case so needs a way to disconnect for dis-assembly. I made the wire a little extra long so it can be pulled out to be un-done.

No Smoke! yeah 

 
 
Next up, de-soldering the main PCB wires! Wiring up the 4 Pole, Double Throw Toggle switch, Cutting plastic for front power switch, holes for laptop power plug, etc...


POST #04

Huge update! It's ALIVE!!!
 
The 7905 and 7812 voltage regulators seem to be ok for the ADAM. *whew* did a huge push this afternoon and evening.
 
 
 
If you feel queasy about 30+ Year Old Plastic being butchered and otherwise mutilated, then turn away. I did some huge hacks to make this work, and would suggest skipping the 4PDT switch to simplify things or even building a separate power brick of sorts to preserve your case. I don't have such feelings and look at this as an improvement when it's all built inside.

Front Mounted power switch. I didn't want to mount it lower as the keyboard may have gotten in the way of it and had to hack a lotta plastic out from this and the top cover. I suppose I could have placed the switch elsewhere like the sides or left side front... but I started cutting and could turn back now 

Soldered into onboard db9 pin holes a floppy connector for IDE CF Adapter. Initially I was thinking of routing power through pin 20 like I did on my Atari xegs IDE CF card, but that's a lotta work.

Onwards to reassembly! I used an eraser to clean off all contact edges and used Automotive Dialectric Grease to prevent corrosion.

Welp, it's almost finished my ADAM project. But as far as the Internal Power Supply is concerned, It's done 