Schematic:
Notes:
Q1 acts as a Colpitts crystal oscillator, and if the crystal under test
is operational, the RF signal is rectified by D1 and D2, turning on Q2 and
lighting indicator LED2. LED1 is a power indicator.
Return to Signal Circuits
Schematic:
Notes:
Q1 acts as a Colpitts crystal oscillator, and if the crystal under test
is operational, the RF signal is rectified by D1 and D2, turning on Q2 and
lighting indicator LED2. LED1 is a power indicator.
Return to Signal Circuits