This transmitter for the 3.5 and 7 MHz ham radio was found in a 1950s Japan publication. No information was given on the coils and the power supply.
The circuit shown is from the National Semiconductor's Linear Applications Handbook. The CI is not...
This circuit is from the Linear Circuits Application of Texas Instruments, using an operational amplifier...
Found in an RF Design from the 90's this circuit is intended for crystals of less than 1 MHz....