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Project proposal : Ring oscillators zoo !

A project log for Hackaday TTLers

Where DIY DIP/SSI/MSI CPU makers meet and discuss other TLA (three letters acronyms)

Yann Guidon / YGDESYann Guidon / YGDES 03/14/2020 at 01:3014 Comments

We TTLers love to test technologies, play with parts and explore new (or old !) realms. And one of the first things we do when we get our hands on a new transistor is see how fast they can go !

For example:
#Ring Oscillators: Fairchild DTL 949 by @Dana Myers
CBJT ring oscillator by @Ted Yapo
Relay ring oscillator
I2L ring oscillator by @Dana Myers
2N2369 ring oscillator / #Discrete Bipolar Logic (RTL/LTL) /  Speed optimisation of pmbt2369 ring oscillator  by @Tim
LTL ring oscillator by @Tim
Emitter-Coupled Logic ECL ring oscillator by @Dana Myers
74AC02 gated ring oscillator by @Ted Yapo
BC548B 5 Stage Ring Oscillator by @agp.cooper
Ring oscillators on Silego GreenPAK 4 by @whitequark ...
(add yours here !)

These days I'm contemplating "tasting" BFP740 (44GHz GBW but not in stock so far) and 2N2369 gates (I have a fistful but not enough to make anything interesting)...

I propose to create a new project/page where we gather all the ring oscillators experiments, sort them by technologies, discuss on measurement details (and gotchas) and agree on a standard "size" to help tally and compare speeds, efficiencies etc.

I was thinking that with my BFS480 (rated at 7GHz) I would need 9 inverters in series to have a reasonably observable waveform and a frequency that my HP5335A could accurately follow.

Is anybody interested ?

Discussions

Yann Guidon / YGDES wrote 05/09/2020 at 22:39 point

yay !

it's awesome what a little capacitor can do :-D

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Yann Guidon / YGDES wrote 05/06/2020 at 11:14 point

awesome log ! thanks !

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agp.cooper wrote 04/02/2020 at 03:05 point

You can add this project: https://hackaday.io/project/12885-a-discrete-transistor-7400-nand-gate

It looks at ring oscillators in the project logs (as a tool the optimize the performance of the discrete transistor 7400).

AlanX

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Yann Guidon / YGDES wrote 04/02/2020 at 13:07 point

added ! thanks !

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Tim wrote 04/01/2020 at 06:24 point

I started a new project here to log some of my RTL ring oscillator experiments:

https://hackaday.io/project/170697-discrete-bipolar-logic-rtlltl

I don't know, is there a better place? hackaday.io is sometimes still a mystery to me regarding collaboration and crosslinking projects and information...

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Yann Guidon / YGDES wrote 04/01/2020 at 10:34 point

Well, HaD is not such a mysterious place and you can always ask around :-)

As a TTLer (a member of this group) you can add logs to this project as well if you want to share your explorations.


And I really like your new project :-) I'm considering buying some PMBTs ;-)

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Tim wrote 04/01/2020 at 11:00 point

It looks like I cannot edit this post, for example, to add links to my entries?

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Tim wrote 04/08/2020 at 03:06 point

Btw, just so you know: Only you can edit your own logs, so noone else will be able to add anything to this page. But I can add my own log entrys, which I can change then.

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Yann Guidon / YGDES wrote 04/08/2020 at 03:16 point

Go ahead then :-)

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Tim wrote 03/14/2020 at 13:27 point

It's a good idea, I think. I see many projects with discrete logic, but not often people report on why they designed it that way or even benchmarked it properly.

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Yann Guidon / YGDES wrote 03/14/2020 at 15:25 point

so it's a good opportunity to discuss about benchmarking :-)

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