This circuit oscillates in the fifth harmonic of the crystal frequency. The circuit is from a 90's documentation. L1 must be according to the desired frequency.
The circuit shown is from the 1994 Linear Applications Handbook from National Semiconductor. Other...
This circuit was found in a 1997 magazine. It uses a CMOS 4060 circuit powered by 12 V which is...
This 1000: 1 voltage-controlled filter circuit was found in an Electronics Today International in a 1980s...