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5 results tagged frequency  ✕   ✕
jbentham/picofreq https://github.com/jbentham/picofreq
Thu 22 May 2025 12:20:13 AM PDT archive.org

Code in both C and Micropython for the RasPi Pico which implements frequency measurement of external signals.

micropython C pico frequency measurements electronics
Frequency counter with a PIC and minimum hardware https://www.qsl.net/dl4yhf/freq_counter/freq_counter.html
Sat 11 Jun 2022 04:44:06 PM PDT archive.org

The homepage of a relatively simple microcontroller-based frequency counter. This design is common to just about all of the kits that you'll find on eBay or Amazon (you know the ones - they don't have any instructions). Usually you'll be looking up construction variant 2 (five digit display) with a 20MHz crystal.

Designed by Wolfgang "Wolf" Büscher, DL4YHF.

Microcontroller used: PIC 16F628

electronics projects rf frequency hamradio archived
ConHam.org: Century-Old Tech at Hacker Cons http://conham.org/
Sat 14 Jul 2018 05:05:46 PM PDT archive.org

If you're at a security conference, and you've got a ham radio license (of any class), grab your radio and set it to 146.580 simplex (no offset).

hamradio cons hacking frequency communications
NE555 Astable Multivibrator Frequency and Duty Cycle Calculator http://www.daycounter.com/Calculators/NE555-Calculator.phtml
Tue 20 Mar 2018 01:48:35 AM PDT archive.org

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.

resistors 555 calculator capacitors timer frequency values electronics
555 Timer Oscillator Frequency Calculator http://totusterra.com/555timercalc.html
Tue 20 Mar 2018 01:42:46 AM PDT archive.org

A simple webapp that calculates the resistor and capacitor values to make a 555 generate a signal of a particular frequency.

555 make oscillator hacks frequency electronics calculator
6375 links, including 417 private
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