Yann Guidon / YGDESWe 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
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Cleaning my backlog: Now at less than 2 ns tpd for RTL!
https://hackaday.io/project/170697-evaluating-transistors-for-bipolar-logic-rtl/log/176980-pushing-rtl-to-2-ns-propagation-delay
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yay !
it's awesome what a little capacitor can do :-D
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Metastable ring oscillator - things get weird here.
https://hackaday.io/project/170697-evaluating-transistors-for-bipolar-logic-rtl/log/179154-using-a-led-as-base-resistor-metastable-ring-oscillator
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One more update for PMBT2369-based RTL:
https://hackaday.io/project/170697-evaluating-transistors-for-bipolar-logic-rtl/log/176979-optimizing-resistors-in-the-pmbt2369-ring-oscillator
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awesome log ! thanks !
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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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added ! thanks !
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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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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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It looks like I cannot edit this post, for example, to add links to my entries?
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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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Go ahead then :-)
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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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so it's a good opportunity to discuss about benchmarking :-)
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