For the reference of the diodes

Franck Lopez

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Aug 28, 2024, 4:33:27 PM8/28/24

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Hello and thank you for accepting me on the blog. I am French and a fan of retrocomputing, as well as vice-president of Museereplay (www.Museereplay.com) . I am starting to design a PDP-8 without using a kit! I am looking for the reference of the diodes. I think there are 27! Thank you for your help.

Franck

Steve Tockey

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Aug 28, 2024, 6:51:01 PM8/28/24

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Franck,

Welcome to the group. Glad to have another retrocomputing enthusiast.

According to the thread: https://groups.google.com/g/pidp-8/c/AoU0LCh2mdA/m/_RO1HQ6yBwAJ he used IN4004 diodes.

Best,

-- steve

Clem Cole

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Aug 28, 2024, 8:31:39 PM8/28/24

to Steve Tockey, PiDP-8

Hmm that doesn’t sound correct as 1N400x families are all rectifier diodes of different wattage - typically used in power and protection applications.

1N914 and 1N4848 was high speed switching diodes (low current) and what most logic designers like Oscar uses for the switching and scanning of things like the front panel.

I can verify that the diodes on all of my PiDPs and my PDP-6 blinkenlights panels are 1N4848 or 1N914

Again. Internet search is your friend and data sheets for all of them are easy to find

Sent from a handheld expect more typos than usual

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Clem Cole

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Aug 29, 2024, 9:35:14 AM8/29/24

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typo: IN4148 not 4848

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Clem Cole

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Aug 29, 2024, 9:41:25 AM8/29/24

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Vishay Datasheet 1N400x family of General Purpose Diodes

Vishay Datasheet 1N4148 Small Signal Fast Switching Diode

NTE Datasheet 1N916 Small Signal Diode

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Clem Cole

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Aug 29, 2024, 9:43:39 AM8/29/24

to Steve Tockey, PiDP-8

Arrgh typed send accidentally:

Vishay Datasheet 1N914 Small Signal Fast Switching Diode

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Clem Cole

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Aug 30, 2024, 7:38:47 PM8/30/24

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do an internet search for: 1n914 datasheet or 1n4848 datasheet

You should be able to find many

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On Wed, Aug 28, 2024 at 4:33 PM Franck Lopez <alia...@gmail.com> wrote:

Hello and thank you for accepting me on the blog. I am French and a fan of retrocomputing, as well as vice-president of Museereplay (www.Museereplay.com) . I am starting to design a PDP-8 without using a kit! I am looking for the reference of the diodes. I think there are 27! Thank you for your help.

Franck

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Obsolescence

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Sep 2, 2024, 3:12:53 PM9/2/24

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Yes, 1N4148. But the diodes have minimal requirements in this schematic, most anything that says Diode will probably do a good job.

Oh - you can find the schematic and Kicad project files in the Google Group's history if you want, or I can send them to you.