Post AR23D2eLlN5Cbte2C0 by penguin42@mastodon.org.uk
(DIR) More posts by penguin42@mastodon.org.uk
(DIR) Post #AR23D2eLlN5Cbte2C0 by penguin42@mastodon.org.uk
2022-12-27T12:34:51Z
0 likes, 1 repeats
When Blue LEDs first came out they were stunningly expensive - this catalogue shows them as £29.40 each with it emphasised as 'Prices are in POUNDS each'. From a 1990 Electrovalue catalogue.#retrocomputing
(DIR) Post #AR24LssjY8EosM9XNI by mkarliner@mastodon.modern-industry.com
2022-12-27T12:47:37Z
0 likes, 0 repeats
@penguin42 I don't still have the advert but I can vividly remember a1960s ad for an OC 71 costing 39 shillings and sixpence
(DIR) Post #AR29n6EEXB0drM0Q0O by Thalass@social.chinwag.org
2022-12-27T13:48:34Z
0 likes, 0 repeats
@penguin42I remember my high school electronics teacher in '96 being very excited about the prospect of LED TVs and things like that.
(DIR) Post #AR2QF6749jNSsN1ekK by v_perjorative@mastodon.org.uk
2022-12-27T16:52:54Z
0 likes, 0 repeats
@penguin42 my dissertation was on using pulse oximetry to monitor carbon monoxide levels in blood.Fortunately I didn't need any LEDs in that colour range, otherwise it would have been a massive waste of money when I entirely cocked everything up, and proved I couldn't design a circuit or write assembler code to save my life.
(DIR) Post #AR2QKCjywSGgsZfCHA by penguin42@mastodon.org.uk
2022-12-27T16:53:52Z
0 likes, 0 repeats
@v_perjorative Pulse Oximetery is a mix of IR and red isn't it? That's the easy end of the spectrum!
(DIR) Post #AR2QVg5ABsfv4A2eVE by v_perjorative@mastodon.org.uk
2022-12-27T16:55:57Z
0 likes, 0 repeats
@penguin42 yup. Still didn't stop me turning several LEDs into small IEDs.Just glad they were relatively cheap.
(DIR) Post #AR2QYRh09DXzJ23mim by penguin42@mastodon.org.uk
2022-12-27T16:56:26Z
0 likes, 0 repeats
@v_perjorative I seem to remember LEDs have an oddly sweet smell when you pop them off :-)