App note: Guidelines on the effects of parasitic capacitance on clock accuracy due to board layout

Board design considerations like board thickness and layer stacking under a crystal when designing PCB for accurate clock crystals discuss in this app note from Maxim Integrated. Link here Crystal oscillator is widely used in RTC applications. Clock accuracy, one of the key parameters in real-time clocks, partly depends on the parasitic capacitance of the […]

Simple crystal tester

Dilshan Jayakody writes: This is simple Colpitts oscillator to test commonly available passive crystals which range between 2MHz to 27MHz. This unit must connect to an oscilloscope and/or frequency counter to get the frequency of the crystal. This circuit is design to work around 9V to 12V DC power source. Both 2SC930 transistors can replace […]

PCB a Week 1: Crystal oscillator breakout

Matseng started a challenge for himself where he intends to post a PCB project a week. The first project is “NanoUtils Xtal” – a crystal oscillator breakout board. The board is designed to be interfaced with microcontrollers that have their oscillator pins next to a ground pin. This board is a breakout containing a SMD […]

Partlist Wednesday: Clock sources

Every Wednesday we highlight a component from the updated Dangerous Prototypes partlist. This week: clock sources. As always, there are footprints for all these parts and more in our public domain Cadsoft Eagle part library. In our workshop the first rule of crystal selection is ‘use a surface mount HC-49/US package if it will fit’. […]