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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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12th Nov 2019, 1:59 am | #21 | ||
No Longer a Member
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
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Re: 555 timer
Quote:
Every version of the original pcb I have seen had the Signetics NE555N in it, so the designer may never have known that he created a circuit didn't work properly with other variants. I only found out it was like this because I built some clone pcb's and initially thought any 555 variant would be ok and I got a surprise when I found out it was not the case. |
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12th Nov 2019, 4:38 pm | #22 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,007
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Re: 555 timer
The 555 is indeed versatile: in the past I used one - feeding a four-diode-four-capacitor voltage-doubler - to generate +/-18V bias-supplies from a single-ended 12V supply. I only needed a milliamp or so of current for each bias-rail so a 555 clocking at about 750Hz did the job perfectly, and didn't involve the need for any expensive-in-small-numbers specialist inductors.
The 555 was also my first "one-shot noise-generating IC" when I inadvertently fed 48VDC into one: the bang and cloud of smoke as the top of the package exploded was quite something! |