Posted on Jan 22, 2013

Diagram shows a 50MHz oscillator operating on a third harmonic. The collector`s load resistor R1 has been increased because the quartz crystal`s internal series resistance Rs increases with frequency in the VHF range. The crystal`s internal series resistance Rs is 30ohm, and the transistor`s minimum current gain HFI, is 100.

Click here to download the full size of the above Circuit.

Using the same technique as for the 20 MHz oscillator, the external series RLCL equivalent load seen by the 50MHz crystal is 5.6ohm (RL) and 1000pF (CL).

Leave Comment

characters left:

New Circuits



Popular Circuits

Soft Start For Amps
Voltmeter circuit
Audio Light Modulator circuit
Triangle-square wave oscillator
10 Band Graphic Equalizer Circuit
doubler voltage with ne555 schematic
basic circuit diagram for pc to microcontroller communication
compressor microphone
Voltage doubler circuit using 555 timer
Robot Proximity Sensor Schematic
Power Supply for the SSY-1 YAG Laser
PGA103 offset voltage correction circuit diagrams
Automatic recording telephone interface circuit