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Sun 31 May 2020 04:02:35 PM PDT
A self-hosted service that pings webhooks or other URLs on a user-defined schedule. Works a little bit like cron. Can even do things every X minutes or hours, like cron.
Written in PHP, uses SQLite.
If you don't want to set it up yourself:
Wed 28 Mar 2018 03:36:23 PM PDT
NE555 Astable Multivibrator Frequency and Duty Cycle Calculator
Tue 20 Mar 2018 01:48:35 AM PDT
A website that takes a parrticular frequency (in KHz) and a duty cycle (at least 50%, or on half the time, off half the time) and calculates the values of the two resistors and the capacitor required to generate that frequency using a 555 IC.
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