Apple 1 Power Supply

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retro_bill's picture
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Apple 1 Power Supply

Need help building my power supply.

 

My motherboard is the Newton non-ati

 

 

 

Here is the power supply cable I have.

 

I can get the Stancor transformers or if you have something better I would like to know what you used and how its all connected!

 

 

Thanks in advance for all your help!

 

Bill

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Power Supply

Hi Bill!

According to the schematic (https://www.applefritter.com/files/a1man.pdf page 11) you will need two transformers: one with a secondary winding giving a voltage of about 8-10V, and a second transformer giving a voltage around 28V with center tapping (meaning 14V+14V).

 

If your connector, as I guess, is oriented to have the black wire facing the edge connector and the green wire facing the heatsink, you will need to:

- connect the two green cables to the 8-10V output of the first transformer,

- connect the "first yellow cable located next to the black cable" to the center tapping of the second transformer,

- connect the other two yellow cables to the respective 14V and 14V branches of the second transformer,

- the black cable is not needed.

 

 

A well-known US based distributor have Hammond transformers (models 186D10 and 186D28) which should also fit your 120VAC.

Both transformer should have a power rating of 30VA or more.

 

Enjoy! :-)

 

Claudio - P-LAB

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Thank you Claudio! How about

Thank you Claudio!

 

How about wiring in a fuse and power switch?

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Hi, As a transformer for the

Hi,

 

As a transformer for the + 5V power supply (LM323K), I propose a transformer with a secondary range of 7.5-8.5V (not more). In this case, your stabilizer will not get very hot. (Some people cook eggs on it and additional use fans - sic).Use fuses on the primary windings of transformers. You can use the chassis panel fuse holder. Separate for each transformer. Run the 230 / 115V power supply through the switch and split it into two transformers.

Sorry for my English, it's not my native language....

Regards,

 

Mateusz SQ9PXB

 

 

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Thank you Mateusz! Now I just

Thank you Mateusz!

 

Now I just need some pictures showing how everything is connected :)

 

 

 

Dziękuję

 

Bill K9BUB

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I used the TRIAD transformers

I used the TRIAD transformers that were specified in the manual, namely the F31-X and the F40-X as they can be bought brand new.

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Warning!
retro_bill wrote:

.... How about wiring in a fuse and power switch?

 

I would recommend that if you are not used to working with mains voltage, be sure to have someone with experience check the wiring and insulation before plugging it in.

 

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retro_bill wrote:Thank you
retro_bill wrote:

Thank you Mateusz!

 

Now I just need some pictures showing how everything is connected :)

 

 

 

Dziękuję

 

Bill K9BUB

 

Its in the manual reasonably well. Some regional differences but it shows US supply from mains, in through fuse then TX then out through switch. Means that with switch off and fuse out, the mains is isolated. 

 

UK mains with appropriate transformer :- the switch and the fuse should be in the live as the neutral should not float above ground and isolation of supply is via the switch or the fuse in a fault. Or, double pole switch in live and neutral with fuse in live.

 

 

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